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Istria 100 by UTMBUmag, Croatia🇭🇷

Istria 100 by UTMB

About Istria 100 by UTMB 2027

Istria 100 by UTMB 2027 is a trail race held from Thu, Apr 1, 2027 to Sun, Apr 4, 2027 in Umag, Croatia; the start is at 17:00.

Registration is open; the deadline is Mon, Feb 1, 2027. Dates, registration windows and fees on this page are refreshed every morning by scanning federation, timing and organiser sites; registration always happens on the official race site.

Someone running 30 km a week needs 28 weeks, about 6.5 months, to prepare for the 168K course of Istria 100 by UTMB 2027; that start day was Thu, Sep 17, 2026, so the window has passed with 24 weeks left to the race.

Courses

CourseDistanceElevation GainFeeCourse file
168K168 km6800 m D+303.75 €GPX
111K111 km4200 m D+258.75 €GPX
69.6K69.6 km2400 m D+157.5 €GPX
42K42 km1000 m D+140.63 €GPX
21.5K21.5 km157 m D+90 €GPX

There are 5 courses: 168K (6800 m D+); 111K (4200 m D+); 69.6K (2400 m D+); 42K (1000 m D+); 21.5K (157 m D+).

Course map and elevation profile

Istria 100 by UTMB 168K course map and elevation profile with checkpoints marked
168K course
Istria 100 by UTMB 111K course map and elevation profile with checkpoints marked
111K course
Istria 100 by UTMB 69.6K course map and elevation profile with checkpoints marked
69.6K course
Istria 100 by UTMB 42K course map and elevation profile with checkpoints marked
42K course
Istria 100 by UTMB 21.5K course map and elevation profile with checkpoints marked
21.5K course

What the weather is usually like here

  • Over the last 5 years this week typically ran 8°C to 15°C here, with a high of 22°C and a low of 3°C.
  • 34% of those days saw rain. A real forecast lands about two weeks out and will appear here then.
  • Typical daily maximum wind was 18 km/h (a light breeze), with 33 km/h the highest value in the sample.
  • Sunrise 06:44, sunset 19:31.

The race is more than two weeks out, so these are averages of recent years for the same week, not a forecast. A real forecast appears here closer to the day.

Race briefing

168K course167 km · 6621 m gain · 35% uphill · 10 aid stations
  • Steep climb (10%+)
  • Climb (3-10%)
  • Flat
  • Descent
  • Steep descent (12%+)

The published GPX measures 167 km with 6621 m of climbing, 40 m per km. The course sits between 2 m and 1386 m of altitude. 60% of the gain sits in the first half.

  • 0-16 km · Start → PLOMIN LUKA: 506 m up / 789 m down; the stretch descends.
  • 16-35 km · PLOMIN LUKA → MOŠĆENIČKA DRAGA: 944 m up / 939 m down; the stretch keeps rolling.
  • 35-51 km · MOŠĆENIČKA DRAGA → POKLON: 1427 m up / 520 m down; the stretch climbs.
  • 51-66 km · POKLON → BRGUDAC: 329 m up / 442 m down; the stretch descends.
  • 66-83 km · BRGUDAC → TRSTENIK: 755 m up / 837 m down; the stretch keeps rolling.
  • 83-99 km · TRSTENIK → BUZET: 383 m up / 1044 m down; the stretch descends.
  • 99-115 km · BUZET → BUTONIGA: 773 m up / 813 m down; the stretch keeps rolling.
  • 115-131 km · BUTONIGA → LIVADE: 793 m up / 669 m down; the stretch keeps rolling.
  • 131-147 km · LIVADE → GROŽNJAN: 596 m up / 468 m down; the stretch keeps rolling.
  • 147-154 km · GROŽNJAN → BUJE: 80 m up / 166 m down; gently rolling.
  • 154-167 km · BUJE → Finish: 36 m up / 227 m down; the stretch descends.

The first 5 km drop 304 m. Fresh legs make it feel free, but you climb every metre of it back.

The backbone of the course runs from km 34 to km 47: 1374 m over 13 km at 11% average, its steepest roughly 250 m section averaging 37% on the GPX trace. Heaviest kilometres: km 40 216 m, km 39 159 m, km 41 153 m, km 46 144 m. Running is off the table only in the steepest roughly 250 m core; hike that part with short steps and run again once the grade eases.

The longest descent starts at km 88 and loses 887 m by km 106 at 5% average, its steepest roughly 250 m section averaging 28%. Its length can load the quads, so begin under control and build rhythm only when the ground and visibility allow it. The drop at km 47 averages 25% over its steepest roughly 250 m section; shorten the stride, stay balanced and set speed to the ground instead of braking continuously.

The last 6 km are close to flat. Plan your finishing pace around that, there is nothing left to save.

The leg from PLOMIN LUKA to MOŠĆENIČKA DRAGA is long and unsupported: 19 km and 944 m of climbing with no aid in between, so leave PLOMIN LUKA with full capacity.

You reach the climb after MOŠĆENIČKA DRAGA with about 939 m of descent already in your quads; treat its first half as recovery effort.

A steep pitch starts within about 0.5 km of BUZET; keep the stop short and do not enter it on cooled-down legs.

A steep pitch starts within about 0.8 km of BUTONIGA; keep the stop short and do not enter it on cooled-down legs.

  • This course reaches 1386 m. At the high-point coordinate, the same week historically ran 1°C to 9°C. Typical daily maximum wind was 12 km/h, reaching 22 km/h in the sample. This is climate history, not the race-day forecast; keep the shell accessible if race week looks similar.
  • Sunset is 19:31 and the finish cut-off is 14:00. A runner using the full time allowance spends the final 11 hours 13 minutes in darkness.
  • Get the headtorch out before sunset and keep spare batteries or a power bank dry and immediately accessible. A spare buried at the bottom of the pack is not an emergency spare.
  • Check reflective course markers regularly in the dark. If the markings disappear, stop moving forward, return to the last marker and confirm the route against the GPX or organiser app.
  • At cut-off pace you run into a second night. Plan the sleep question before race day: an hour gained on the first night costs two on the second.
  • Poles are strongly recommended for this profile. The course averages 40 m of gain per km and the longest climb averaging over 5% runs 13 km; if you have trained with them and the organiser allows them, use them on the climbs and stow them on runnable ground.
  • Point to point: the finish sits 61.1 km from the start as the crow flies. Sort the shuttle and your drop bag before race day.

Course-profile notes are generated from GPX grade data; terrain, rules, aid stations and weather are added only when separately sourced.

Aid stations

Key decision points

PLOMIN LUKAkm 16

  • Drinks only; arrive carrying your own food.
  • A heavy leg is next: 19 km with 926 m of climbing.
  • The longest unsupported stretch starts here: 19 km. Leave with full capacity.
  • Cut-off: 3h after the start.

MOŠĆENIČKA DRAGAkm 35

  • Drinks only; arrive carrying your own food.
  • Crew access is allowed here.
  • The heaviest leg is next: 17 km with 1430 m of climbing.
  • Cut-off: 7h after the start.

POKLONkm 51

  • Drinks only; arrive carrying your own food.
  • Crew access is allowed here.
  • Cut-off: 13h after the start.

BRGUDACkm 66

  • Drinks only; arrive carrying your own food.
  • A heavy leg is next: 17 km with 792 m of climbing.
  • The climb starts immediately on exit (26%); keep the stop short.
  • Cut-off: 16h after the start.

TRSTENIKkm 83

  • Drinks only; arrive carrying your own food.
  • A heavy leg is next: 15 km with 414 m of climbing.
  • Cut-off: 21h after the start.

BUZETkm 99

  • Take hot food you digest easily and top up fluids.
  • Your drop bag waits here; work off your prepared list.
  • Crew access is allowed here.
  • A heavy leg is next: 17 km with 772 m of climbing.
  • Cut-off: 25h after the start.

BUTONIGAkm 115

  • Drinks only; arrive carrying your own food.
  • A heavy leg is next: 16 km with 641 m of climbing.
  • Cut-off: 30h after the start.

LIVADEkm 131

  • Drinks only; arrive carrying your own food.
  • Crew access is allowed here.
  • A heavy leg is next: 16 km with 677 m of climbing.
  • Cut-off: 35h after the start.
  • The longest stretch between official aid stations runs from PLOMIN LUKA (km 16) to MOŠĆENIČKA DRAGA (km 35): 19 km, with 926 m of climbing in between. Top up at PLOMIN LUKA and size what you carry to the expected duration and your own drinking rate.
  • Drinks only, no food, at PLOMIN LUKA (km 16) and MOŠĆENIČKA DRAGA (km 35) and 7 more. Loosen the flask caps on approach; with no queue, refill and leave in 20-30 seconds. Carry the food you will need from the previous station.
  • Hot food is served at BUZET (km 99). If your stomach and race plan call for it, make this a deliberate 3-5 minute stop; do not sit down simply because hot food is available. Restart gently and let your stomach settle before lifting the effort.
  • Drop bag at BUZET (km 99). Write down the equipment and food you expect to replace before the race so the decision is already made when you arrive.
  • Crew support is permitted only at MOŠĆENIČKA DRAGA (km 35), POKLON (km 51), BUZET (km 99), and LIVADE (km 131). This is not the same as a drop bag: plan equipment and food hand-offs around these stations, then verify wristband, bag and transport rules with the organiser.
  • The last aid station is BUJE (km 154), leaving 14 km to the finish. After that you are on what you carry.
  • The heaviest leg runs from MOŠĆENIČKA DRAGA (km 35) to POKLON (km 51): 17 km with 1430 m of climbing. Treat it as the slowest part of your day and get your food out before it.
  • Medical support is available at MOŠĆENIČKA DRAGA (km 35), POKLON (km 51), BRGUDAC (km 66), TRSTENIK (km 83), BUZET (km 99), BUTONIGA (km 115), LIVADE (km 131), GROŽNJAN (km 147), BUJE (km 154), and UMAG (km 168). If something is wrong with your feet or your stomach, deal with it there rather than pushing on.
  • The climbing starts the moment you leave BRGUDAC (km 66): the steepest roughly 250 m section averages 26%. Only drinks are served here, so fill the bottles and carry your own food in, then begin the climb under control.
  • The overall cut-off is 45h, including all checkpoint stops. Build the plan around the official leg budgets below, not a flat-course average pace.
  • Relative to distance and climbing, the tightest official time budget runs from PLOMIN LUKA (km 16) to MOŠĆENIČKA DRAGA (km 35): the official time budget is 4h for 19 km and 944 m of climbing. Station stops come out of that same budget, so do not enter the leg already behind schedule.

Official cut-off ladder

LegDistanceD+Official time budgetCloses
Start → PLOMIN LUKA16 km506 m3hstart + 3h
PLOMIN LUKA → MOŠĆENIČKA DRAGA19 km944 m4hstart + 7h
MOŠĆENIČKA DRAGA → POKLON17 km1427 m6hstart + 13h
POKLON → BRGUDAC15 km329 m3hstart + 16h
BRGUDAC → TRSTENIK17 km755 m5hstart + 21h
TRSTENIK → BUZET15 km383 m4hstart + 25h
BUZET → BUTONIGA17 km773 m5hstart + 30h
BUTONIGA → LIVADE16 km793 m5hstart + 35h
LIVADE → GROŽNJAN16 km596 m4hstart + 39h
GROŽNJAN → BUJE7 km80 m2hstart + 41h
BUJE → UMAG15 km36 m4hstart + 45h

Budgets are derived from the cut-off times published by the organiser; they are not a personal finish estimate.

StationKmFrom previousSuppliesMedicalCrewCut-off
LABIN0——NoNo—
PLOMIN LUKA1616DrinksNoNoFriday 20:00
MOŠĆENIČKA DRAGA3519DrinksYesYesSaturday 00:00
POKLON5117DrinksYesYesSaturday 06:00
BRGUDAC6615DrinksYesNoSaturday 09:00
TRSTENIK8317DrinksYesNoSaturday 14:00
BUZETDrop bag9915Hot foodYesYesSaturday 18:00
BUTONIGA11517DrinksYesNoSaturday 23:00
LIVADE13116DrinksYesYesSunday 04:00
GROŽNJAN14716DrinksYesNoSunday 08:00
BUJE1546.9DrinksYesNoSunday 10:00
UMAG16815Hot foodYesNoSunday 14:00

Aid station details come from the list published by the organiser; confirm them at the official source before race day.

Plan your cutoffs for this course

111K course111 km · 4022 m gain · 35% uphill · 7 aid stations
  • Steep climb (10%+)
  • Climb (3-10%)
  • Flat
  • Descent
  • Steep descent (12%+)

The published GPX measures 111 km with 4022 m of climbing, 36 m per km. The course sits between 3 m and 1017 m of altitude. 60% of the gain sits in the first half.

  • 0-15 km · Start → PRAPOĆE: 695 m up / 268 m down; the stretch climbs.
  • 15-26 km · PRAPOĆE → TRSTENIK: 637 m up / 445 m down; the stretch climbs.
  • 26-42 km · TRSTENIK → BUZET: 416 m up / 1024 m down; the stretch descends.
  • 42-59 km · BUZET → BUTONIGA: 771 m up / 831 m down; the stretch keeps rolling.
  • 59-74 km · BUTONIGA → LIVADE: 682 m up / 670 m down; the stretch keeps rolling.
  • 74-90 km · LIVADE → GROŽNJAN: 694 m up / 445 m down; the stretch climbs.
  • 90-97 km · GROŽNJAN → BUJE: 74 m up / 161 m down; gently rolling.
  • 97-111 km · BUJE → Finish: 52 m up / 249 m down; the stretch descends.

The race climbs from the gun: 195 m over the first 5 km. Do not chase the crowd, the two minutes you win here get taken back with interest.

The backbone of the course runs from km 0 to km 12: net 588 m over 12 km at 5% average, its steepest roughly 250 m section averaging 20%, 685 m of climbing in total with 97 m given back. Heaviest kilometres: km 9 157 m, km 4 101 m, km 7 64 m, km 8 64 m. This is hiking terrain, not running terrain. Walk it with intent and keep your heart rate off the ceiling.

The climb between km 15 and km 24: net 515 m over 9.1 km at 6% average, its steepest roughly 250 m section averaging 20%, 624 m of climbing in total with 109 m given back. Heaviest kilometres: km 17 113 m, km 16 111 m, km 22 109 m, km 20 78 m. Trying to run this costs far more than it saves. Shorten the stride, lean on the poles, keep moving.

The steepest wall stands between km 73 and km 76: 361 m over 3.7 km at 10% average, its steepest roughly 250 m section averaging 24%. Kilometre by kilometre: km 74 17 m, km 75 176 m, km 76 151 m. By the time you start it, about 79% of the day's climbing is behind you. Forcing a run up this climb takes more than it gives. Hike it and keep your heart rate away from the ceiling.

The longest descent starts at km 31 and loses 955 m by km 43 at 8% average, its steepest roughly 250 m section averaging 26%. Its length can load the quads, so begin under control and build rhythm only when the ground and visibility allow it. The drop at km 24 averages 26% over its steepest roughly 250 m section; shorten the stride, stay balanced and set speed to the ground instead of braking continuously.

The last 6 km are close to flat. Plan your finishing pace around that, there is nothing left to save.

A steep pitch starts within about 1 km of BUZET; keep the stop short and do not enter it on cooled-down legs.

The leg from BUZET to BUTONIGA is long and unsupported: 17 km and 771 m of climbing with no aid in between, so leave BUZET with full capacity.

A steep pitch starts within about 1.5 km of BUTONIGA; keep the stop short and do not enter it on cooled-down legs.

You reach the climb after LIVADE with about 670 m of descent already in your quads; treat its first half as recovery effort.

  • This course reaches 1017 m. At the high-point coordinate, the same week historically ran 2°C to 11°C. Typical daily maximum wind was 18 km/h, reaching 33 km/h in the sample. This is climate history, not the race-day forecast; keep the shell accessible if race week looks similar.
  • Sunset is 19:32 and the finish cut-off is 11:00. A runner using the full time allowance spends the final 11 hours 12 minutes in darkness.
  • Get the headtorch out before sunset and keep spare batteries or a power bank dry and immediately accessible. A spare buried at the bottom of the pack is not an emergency spare.
  • Check reflective course markers regularly in the dark. If the markings disappear, stop moving forward, return to the last marker and confirm the route against the GPX or organiser app.
  • Consider bringing poles. The course averages 36 m of gain per km and the longest climb averaging over 5% runs 9.1 km; if you have trained with them and the organiser allows them, use them on the climbs and stow them on runnable ground.
  • The climbing is stacked into the first half. Start easy; even with less climbing later, the descents and accumulated fatigue still have to be managed.
  • Point to point: the finish sits 35.2 km from the start as the crow flies. Sort the shuttle and your drop bag before race day.

Course-profile notes are generated from GPX grade data; terrain, rules, aid stations and weather are added only when separately sourced.

Aid stations

Key decision points

PRAPOĆEkm 15

  • Drinks only; arrive carrying your own food.
  • A heavy leg is next: 12 km with 613 m of climbing.
  • Cut-off: 3h after the start.

TRSTENIKkm 26

  • Drinks only; arrive carrying your own food.
  • A heavy leg is next: 15 km with 410 m of climbing.
  • Cut-off: 6h after the start.

BUZETkm 42

  • Take hot food you digest easily and top up fluids.
  • Your drop bag waits here; work off your prepared list.
  • Crew access is allowed here.
  • The heaviest leg is next: 17 km with 770 m of climbing.
  • The longest unsupported stretch starts here: 17 km. Leave with full capacity.
  • Cut-off: 10h after the start.

BUTONIGAkm 59

  • Drinks only; arrive carrying your own food.
  • A heavy leg is next: 16 km with 642 m of climbing.
  • Cut-off: 14h after the start.

LIVADEkm 74

  • Drinks only; arrive carrying your own food.
  • Crew access is allowed here.
  • A heavy leg is next: 16 km with 681 m of climbing.
  • A 24% pitch starts about 0.8 km after the station; do not enter it cooled down.
  • Cut-off: 18h after the start.
  • The longest stretch between official aid stations runs from BUZET (km 42) to BUTONIGA (km 59): 17 km, with 770 m of climbing in between. Top up at BUZET and size what you carry to the expected duration and your own drinking rate.
  • Drinks only, no food, at PRAPOĆE (km 15) and TRSTENIK (km 26) and 4 more. Loosen the flask caps on approach; with no queue, refill and leave in 20-30 seconds. Carry the food you will need from the previous station.
  • Hot food is served at BUZET (km 42). If your stomach and race plan call for it, make this a deliberate 3-5 minute stop; do not sit down simply because hot food is available. Restart gently and let your stomach settle before lifting the effort.
  • Drop bag at BUZET (km 42). Write down the equipment and food you expect to replace before the race so the decision is already made when you arrive.
  • Crew support is permitted only at BUZET (km 0), BUZET (km 42), and LIVADE (km 74). This is not the same as a drop bag: plan equipment and food hand-offs around these stations, then verify wristband, bag and transport rules with the organiser.
  • The last aid station is BUJE (km 97), leaving 14 km to the finish. After that you are on what you carry.
  • Another heavy leg runs from LIVADE (km 74) to GROŽNJAN (km 90): 16 km with 681 m of climbing. Treat it as the slowest part of your day and get your food out before it.
  • Medical support is available at BUZET (km 0), PRAPOĆE (km 15), TRSTENIK (km 26), BUZET (km 42), BUTONIGA (km 59), LIVADE (km 74), GROŽNJAN (km 90), BUJE (km 97), and UMAG (km 112). If something is wrong with your feet or your stomach, deal with it there rather than pushing on.
  • About 0.8 km after LIVADE (km 74), a roughly 250 m section averaging 24% begins. Only drinks are served here, so fill the bottles and carry your own food in, then enter the climb at a controlled effort.
  • The overall cut-off is 28h, including all checkpoint stops. Build the plan around the official leg budgets below, not a flat-course average pace.
  • Relative to distance and climbing, the tightest official time budget runs from Start to PRAPOĆE (km 15): the official time budget is 3h for 15 km and 695 m of climbing. Station stops come out of that same budget, so do not enter the leg already behind schedule.

Official cut-off ladder

LegDistanceD+Official time budgetCloses
Start → PRAPOĆE15 km695 m3hstart + 3h
PRAPOĆE → TRSTENIK12 km637 m3hstart + 6h
TRSTENIK → BUZET15 km416 m4hstart + 10h
BUZET → BUTONIGA17 km771 m4hstart + 14h
BUTONIGA → LIVADE16 km682 m4hstart + 18h
LIVADE → GROŽNJAN16 km694 m4hstart + 22h
GROŽNJAN → BUJE7 km74 m2hstart + 24h
BUJE → UMAG15 km52 m4hstart + 28h

Budgets are derived from the cut-off times published by the organiser; they are not a personal finish estimate.

StationKmFrom previousSuppliesMedicalCrewCut-off
BUZET0——YesYes—
PRAPOĆE1515DrinksYesNoSaturday 10:00
TRSTENIK2612DrinksYesNoSaturday 13:00
BUZETDrop bag4215Hot foodYesYesSaturday 17:00
BUTONIGA5917DrinksYesNoSaturday 21:00
LIVADE7415DrinksYesYesSunday 01:00
GROŽNJAN9016DrinksYesNoSunday 05:00
BUJE976.9DrinksYesNoSunday 07:00
UMAGDrop bag11215Hot foodYesNoSunday 11:00

Aid station details come from the list published by the organiser; confirm them at the official source before race day.

Plan your cutoffs for this course

69.6K course69 km · 2291 m gain · 26% uphill · 4 aid stations
  • Steep climb (10%+)
  • Climb (3-10%)
  • Flat
  • Descent
  • Steep descent (12%+)

The published GPX measures 69 km with 2291 m of climbing, 33 m per km. The course sits between 3 m and 409 m of altitude. 78% of the gain sits in the first half.

  • 0-17 km · Start → BUTONIGA: 786 m up / 830 m down; the stretch keeps rolling.
  • 17-32 km · BUTONIGA → LIVADE: 660 m up / 671 m down; the stretch keeps rolling.
  • 32-48 km · LIVADE → GROŽNJAN: 718 m up / 446 m down; the stretch climbs.
  • 48-55 km · GROŽNJAN → BUJE: 52 m up / 170 m down; gently rolling.
  • 55-69 km · BUJE → Finish: 76 m up / 245 m down; the stretch descends.

The race climbs from the gun: 257 m over the first 5 km. Do not chase the crowd, the two minutes you win here get taken back with interest.

The climb between km 9 and km 11: 280 m over 2.3 km at 12% average, its steepest roughly 250 m section averaging 21%. Kilometre by kilometre: km 10 128 m, km 11 111 m. This is hiking terrain, not running terrain. Walk it with intent and keep your heart rate off the ceiling.

The backbone of the course runs from km 17 to km 21: 379 m over 4.1 km at 9% average, its steepest roughly 250 m section averaging 23%. Kilometre by kilometre: km 19 66 m, km 20 154 m, km 21 157 m. Trying to run this costs far more than it saves. Shorten the stride, lean on the poles, keep moving.

The steepest wall stands between km 31 and km 35: 365 m over 3.7 km at 10% average, its steepest roughly 250 m section averaging 25%. Kilometre by kilometre: km 33 88 m, km 34 202 m, km 35 75 m. By the time you start it, about 63% of the day's climbing is behind you. Forcing a run up this climb takes more than it gives. Hike it and keep your heart rate away from the ceiling.

The longest drag runs from km 39 to km 44: net 264 m over 5.5 km at 5% average, its steepest roughly 250 m section averaging 12%, 315 m of climbing in total with 51 m given back. Kilometre by kilometre: km 40 31 m, km 41 46 m, km 42 55 m, km 43 96 m, km 44 66 m. Hike this one with intent.

The longest descent starts at km 44 and loses 220 m by km 54 at 2% average, its steepest roughly 250 m section averaging 9%. Its length can load the quads, so begin under control and build rhythm only when the ground and visibility allow it. The drop at km 21 averages 20% over its steepest roughly 250 m section; shorten the stride, stay balanced and set speed to the ground instead of braking continuously.

The last 6 km are close to flat. Plan your finishing pace around that, there is nothing left to save.

You reach the climb after LIVADE with about 671 m of descent already in your quads; treat its first half as recovery effort.

The leg from LIVADE to GROŽNJAN is long and unsupported: 16 km and 718 m of climbing with no aid in between, so leave LIVADE with full capacity.

  • This course reaches 409 m. At the high-point coordinate, the same week historically ran 7°C to 15°C. Typical daily maximum wind was 18 km/h, reaching 32 km/h in the sample. This is climate history, not the race-day forecast; keep the shell accessible if race week looks similar.
  • Sunset is 19:32 and the finish cut-off is 23:59. A runner using the full time allowance spends the final 4 hours 27 minutes in darkness.
  • Get the headtorch out before sunset and keep spare batteries or a power bank dry and immediately accessible. A spare buried at the bottom of the pack is not an emergency spare.
  • Check reflective course markers regularly in the dark. If the markings disappear, stop moving forward, return to the last marker and confirm the route against the GPX or organiser app.
  • Consider bringing poles. The course averages 33 m of gain per km and the longest climb averaging over 5% runs 4.1 km; if you have trained with them and the organiser allows them, use them on the climbs and stow them on runnable ground.
  • The climbing is stacked into the first half. Start easy; even with less climbing later, the descents and accumulated fatigue still have to be managed.
  • Point to point: the finish sits 35.2 km from the start as the crow flies. Sort the shuttle and your drop bag before race day.

Course-profile notes are generated from GPX grade data; terrain, rules, aid stations and weather are added only when separately sourced.

Aid stations

Key decision points

BUTONIGAkm 17

  • Collect food and fluids and leave within 60-90 seconds.
  • A heavy leg is next: 15 km with 635 m of climbing.
  • Cut-off: 3h 30m after the start.

LIVADEkm 32

  • Collect food and fluids and leave within 60-90 seconds.
  • Crew access is allowed here.
  • A heavy leg is next: 16 km with 686 m of climbing.
  • A 25% pitch starts about 0.8 km after the station; do not enter it cooled down.
  • Cut-off: 7h after the start.
  • The longest stretch between official aid stations runs from BUZET (km 0) to BUTONIGA (km 17): 17 km, with 767 m of climbing in between. Top up at BUZET and size what you carry to the expected duration and your own drinking rate.
  • Drinks only, no food, at GROŽNJAN (km 48) and BUJE (km 55). Loosen the flask caps on approach; with no queue, refill and leave in 20-30 seconds. Carry the food you will need from the previous station.
  • Food is available at BUTONIGA (km 17) and LIVADE (km 32). Decide what you need before reaching the table; without a planned special task, collect food and fluids and leave within 60-90 seconds. Finish eating on the next calm, suitable section.
  • Crew support is permitted only at BUZET (km 0) and LIVADE (km 32). This is not the same as a drop bag: plan equipment and food hand-offs around these stations, then verify wristband, bag and transport rules with the organiser.
  • The last aid station is BUJE (km 55), leaving 15 km to the finish. After that you are on what you carry.
  • Another heavy leg runs from LIVADE (km 32) to GROŽNJAN (km 48): 16 km with 686 m of climbing. Treat it as the slowest part of your day and get your food out before it.
  • Medical support is available at BUZET (km 0), BUTONIGA (km 17), LIVADE (km 32), GROŽNJAN (km 48), BUJE (km 55), and UMAG (km 70). If something is wrong with your feet or your stomach, deal with it there rather than pushing on.
  • About 0.8 km after LIVADE (km 32), a roughly 250 m section averaging 25% begins. Choose food you know you digest easily and fill the bottles, then enter the climb at a controlled effort.
  • The overall cut-off is 14h 59m, including all checkpoint stops. Build the plan around the official leg budgets below, not a flat-course average pace.
  • Relative to distance and climbing, the tightest official time budget runs from Start to BUTONIGA (km 17): the official time budget is 3h 30m for 17 km and 786 m of climbing. Station stops come out of that same budget, so do not enter the leg already behind schedule.

Official cut-off ladder

LegDistanceD+Official time budgetCloses
Start → BUTONIGA17 km786 m3h 30mstart + 3h 30m
BUTONIGA → LIVADE15 km660 m3h 30mstart + 7h
LIVADE → GROŽNJAN16 km718 m3h 30mstart + 10h 30m
GROŽNJAN → BUJE7 km52 m1h 30mstart + 12h
BUJE → UMAG15 km76 m2h 59mstart + 14h 59m

Budgets are derived from the cut-off times published by the organiser; they are not a personal finish estimate.

StationKmFrom previousSuppliesMedicalCrewCut-off
BUZET0——YesYes—
BUTONIGA1717FoodYesNoSaturday 12:30
LIVADE3215FoodYesYesSaturday 16:00
GROŽNJAN4816DrinksYesNoSaturday 19:30
BUJE556.9DrinksYesNoSaturday 21:00
UMAGDrop bag7015Hot foodYesNoSaturday 23:59

Aid station details come from the list published by the organiser; confirm them at the official source before race day.

Plan your cutoffs for this course

42K course42 km · 962 m gain · 16% uphill · 3 aid stations
  • Steep climb (10%+)
  • Climb (3-10%)
  • Flat
  • Descent
  • Steep descent (12%+)

The published GPX measures 42 km with 962 m of climbing, 23 m per km. The course sits between 3 m and 380 m of altitude. 87% of the gain sits in the first half.

  • 0-5.1 km · Start → LIVADE: 121 m up / 266 m down; the stretch descends.
  • 5.1-21 km · LIVADE → GROŽNJAN: 704 m up / 435 m down; the stretch climbs.
  • 21-28 km · GROŽNJAN → BUJE: 43 m up / 166 m down; gently rolling.
  • 28-42 km · BUJE → Finish: 94 m up / 249 m down; the stretch descends.

The first 3.4 km drop 167 m. Fresh legs make it feel free, but you climb every metre of it back.

The backbone of the course runs from km 4 to km 8: 365 m over 3.7 km at 10% average, its steepest roughly 250 m section averaging 24%. Kilometre by kilometre: km 6 62 m, km 7 210 m, km 8 93 m. This is hiking terrain, not running terrain. Walk it with intent and keep your heart rate off the ceiling.

The longest drag runs from km 12 to km 17: net 260 m over 5.2 km at 5% average, its steepest roughly 250 m section averaging 15%, 302 m of climbing in total with 42 m given back. Kilometre by kilometre: km 13 17 m, km 14 55 m, km 15 43 m, km 16 96 m, km 17 77 m. By the time you start it, about 51% of the day's climbing is behind you. Trying to run this costs far more than it saves. Shorten the stride, lean on the poles, keep moving.

The longest descent starts at km 17 and loses 220 m by km 28 at 2% average, its steepest roughly 250 m section averaging 8%. Its length can load the quads, so begin under control and build rhythm only when the ground and visibility allow it. The drop at km 1 averages 19% over its steepest roughly 250 m section; shorten the stride, stay balanced and set speed to the ground instead of braking continuously.

The last 5.1 km are close to flat. Plan your finishing pace around that, there is nothing left to save.

The leg from LIVADE to GROŽNJAN is long and unsupported: 16 km and 704 m of climbing with no aid in between, so leave LIVADE with full capacity.

  • Cut-off lands at 20:00 and sunset at 19:32, near enough the same moment. Go slower than planned and the last kilometres are in the dark, so pack the torch.
  • Consider bringing poles. The course averages 23 m of gain per km and the longest climb averaging over 5% runs 3.7 km; if you have trained with them and the organiser allows them, use them on the climbs and stow them on runnable ground.
  • The climbing is stacked into the first half. Start easy; even with less climbing later, the descents and accumulated fatigue still have to be managed.
  • Point to point: the finish sits 26.3 km from the start as the crow flies. Sort the shuttle and your drop bag before race day.

Course-profile notes are generated from GPX grade data; terrain, rules, aid stations and weather are added only when separately sourced.

Aid stations

Key decision points

LIVADEkm 5.1

  • Collect food and fluids and leave within 60-90 seconds.
  • The heaviest leg is next: 16 km with 723 m of climbing.
  • The longest unsupported stretch starts here: 16 km. Leave with full capacity.
  • A 24% pitch starts about 1 km after the station; do not enter it cooled down.
  • Cut-off: 1h after the start.
  • The longest stretch between official aid stations runs from LIVADE (km 5) to GROŽNJAN (km 21): 16 km, with 723 m of climbing in between. Top up at LIVADE and size what you carry to the expected duration and your own drinking rate.
  • Drinks only, no food, at GROŽNJAN (km 21) and BUJE (km 28). Loosen the flask caps on approach; with no queue, refill and leave in 20-30 seconds. Carry the food you will need from the previous station.
  • Food is available at LIVADE (km 5). Decide what you need before reaching the table; without a planned special task, collect food and fluids and leave within 60-90 seconds. Finish eating on the next calm, suitable section.
  • The last aid station is BUJE (km 28), leaving 14 km to the finish. After that you are on what you carry.
  • Medical support is available at LIVADE (km 5), GROŽNJAN (km 21), BUJE (km 28), and UMAG (km 43). If something is wrong with your feet or your stomach, deal with it there rather than pushing on.
  • About 1 km after LIVADE (km 5), a roughly 250 m section averaging 24% begins. Choose food you know you digest easily and fill the bottles, then enter the climb at a controlled effort.
  • The overall cut-off is 8h, including all checkpoint stops. Build the plan around the official leg budgets below, not a flat-course average pace.
  • Relative to distance and climbing, the tightest official time budget runs from LIVADE (km 5) to GROŽNJAN (km 21): the official time budget is 3h for 16 km and 704 m of climbing. Station stops come out of that same budget, so do not enter the leg already behind schedule.

Official cut-off ladder

LegDistanceD+Official time budgetCloses
Start → LIVADE5.1 km121 m1hstart + 1h
LIVADE → GROŽNJAN16 km704 m3hstart + 4h
GROŽNJAN → BUJE7 km43 m1h 30mstart + 5h 30m
BUJE → UMAG15 km94 m2h 30mstart + 8h

Budgets are derived from the cut-off times published by the organiser; they are not a personal finish estimate.

StationKmFrom previousSuppliesMedicalCrewCut-off
MOTOVUN0——NoNo—
LIVADE5.15.1FoodYesNoSaturday 13:00
GROŽNJAN2116DrinksYesNoSaturday 16:00
BUJE287DrinksYesNoSaturday 17:30
UMAGDrop bag4315Hot foodYesNoSaturday 20:00

Aid station details come from the list published by the organiser; confirm them at the official source before race day.

Plan your cutoffs for this course

21.5K course22 km · 141 m gain · 6% uphill · 1 aid station
  • Climb (3-10%)
  • Flat
  • Descent

The published GPX measures 22 km with 141 m of climbing, 7 m per km. The course sits between 3 m and 297 m of altitude.

The first 1.7 km are close to flat, good for settling in. Do not set your pace here, the real course starts after.

The longest descent starts at km 1 and loses 143 m by km 7 at 2% average, its steepest roughly 250 m section averaging 8%. Its length can load the quads, so begin under control and build rhythm only when the ground and visibility allow it.

The last 2.6 km are close to flat. Plan your finishing pace around that, there is nothing left to save.

  • Even at cut-off pace you finish 5 hours 33 minutes before sunset. This one is run entirely in daylight.
  • The profile does not show a clear need for poles: 7 m of gain per km. If you are not used to them, running with your hands free may be more comfortable.
  • Point to point: the finish sits 17 km from the start as the crow flies. Sort the shuttle and your drop bag before race day.

Course-profile notes are generated from GPX grade data; terrain, rules, aid stations and weather are added only when separately sourced.

Aid stations

Key decision points

BUJEkm 6.9

  • Drinks only; arrive carrying your own food.
  • The longest unsupported stretch starts here: 15 km. Leave with full capacity.
  • Cut-off: 1h 20m after the start.
  • The longest stretch between official aid stations runs from BUJE (km 7) to UMAG (km 22): 15 km. Top up at BUJE and size what you carry to the expected duration and your own drinking rate.
  • Drinks only, no food, at BUJE (km 7). Loosen the flask caps on approach; with no queue, refill and leave in 20-30 seconds. Carry the food you will need from the previous station.
  • Medical support is available at GROŽNJAN (km 0), BUJE (km 7), and UMAG (km 22). If something is wrong with your feet or your stomach, deal with it there rather than pushing on.
  • The overall cut-off is 4h, including all checkpoint stops. Build the plan around the official leg budgets below, not a flat-course average pace.
  • Relative to distance and climbing, the tightest official time budget runs from BUJE (km 7) to UMAG (km 22): the official time budget is 2h 40m for 15 km and 95 m of climbing. Station stops come out of that same budget, so do not enter the leg already behind schedule.
StationKmFrom previousSuppliesMedicalCrewCut-off
GROŽNJAN0——YesNo—
BUJE6.96.9DrinksYesNoSunday 11:20
UMAGDrop bag2215Hot foodYesNoSunday 14:00

Aid station details come from the list published by the organiser; confirm them at the official source before race day.

Plan your cutoffs for this course

Calculators for this race

Cutoff planTrail effort distanceRace time predictorRace fuellingPace calculatorTraining lead time

Registration

  • StandardThu, Jun 18, 2026 - Mon, Feb 1, 2027Registration open

Data sources: UTMB World Series, official site (istria.utmb.world) · Last checked:

Tune-up races

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Frequently asked questions

(39)
What is Istria 100 by UTMB?

Istria 100 by UTMB: Thu, Apr 1, 2027, Umag, Croatia. Date, courses and registration details for this Trail race.

When is Istria 100 by UTMB 2027?

Istria 100 by UTMB takes place on Thu, Apr 1, 2027 - Sun, Apr 4, 2027. Start time: 17:00.

Where does Istria 100 by UTMB take place?

Istria 100 by UTMB takes place in Umag, Croatia.

What are the courses and distances of Istria 100 by UTMB 2027?

Istria 100 by UTMB offers 5 courses: 168K (168 km, 6800 m D+); 111K (111 km, 4200 m D+); 69.6K (69.6 km, 2400 m D+); 42K (42 km, 1000 m D+); 21.5K (21.5 km, 157 m D+).

How hard is Istria 100 by UTMB 2027?

Difficulty is measured in km-effort: distance plus ascent divided by 100. The 168K course covers 168 km with 6800 m of climbing, which is 236 km-effort and falls in ITRA category XXL. All courses: 168K 236 km-effort (XXL), 111K 153 km-effort (L), 69.6K 94 km-effort (M), 42K 52 km-effort (S), 21.5K 23 km-effort (XXS).

Is registration for Istria 100 by UTMB 2027 open?

Registration appears to be open; the deadline is Mon, Feb 1, 2027.

When is the registration deadline for Istria 100 by UTMB 2027?

The registration deadline for Istria 100 by UTMB is Mon, Feb 1, 2027.

Where are the Istria 100 by UTMB photos?

Istria 100 by UTMB photos are in the organiser's gallery: https://istria.utmb.world/get-excited/sportograf. The gallery may also cover earlier editions.

What is the official website of Istria 100 by UTMB?

Official website: https://istria.utmb.world/

Is a medical certificate required for Istria 100 by UTMB?

No, the organiser does not require a medical certificate. See the organiser's official page for the exact wording.

Is the Istria 100 by UTMB 2027 course a loop or an out and back?

The 168K course is point to point, finishing 61.1 km from the start; measured from the GPX file it runs 166.8 km. The 111K course is point to point, finishing 35.2 km from the start; measured from the GPX file it runs 110.7 km. The 69.6K course is point to point, finishing 35.2 km from the start; measured from the GPX file it runs 69.1 km.

Where is the hardest climb at Istria 100 by UTMB 2027?

The biggest climb on the 168K course runs from km 34 to km 47: 13 km for 1374 m at 11% average; its steepest roughly 250 m section averages 37%. It tops out at 1380 m.

How high does Istria 100 by UTMB 2027 go?

The 168K course runs between 2 m and 1386 m with 6621 m of total climbing.

Do you need poles at Istria 100 by UTMB 2027?

The 168K course averages 40 m of gain per km with a longest climb of 13 km, so poles help noticeably.

Do you need a headtorch at Istria 100 by UTMB 2027?

168K: Sunset is 19:31 and the finish cut-off is 14:00. A runner using the full time allowance spends the final 11 hours 13 minutes in darkness. Get the headtorch out before sunset and keep spare batteries or a power bank dry and immediately accessible. A spare buried at the bottom of the pack is not an emergency spare. Check reflective course markers regularly in the dark. If the markings disappear, stop moving forward, return to the last marker and confirm the route against the GPX or organiser app. At cut-off pace you run into a second night. Plan the sleep question before race day: an hour gained on the first night costs two on the second.

What is the weather like at Istria 100 by UTMB 2027?

Over the last 5 years the same week here measured 8°C to 15°C, with a high of 22°C, a low of 3°C and rain on 34% of days. A real forecast lands about two weeks out.

Where are the aid stations at Istria 100 by UTMB 2027?

The 168K course has 10 stations; the first at km 16 and the last at km 154. The longest gap between them is 19 km, between PLOMIN LUKA and MOŠĆENIČKA DRAGA.

What is served at the Istria 100 by UTMB 2027 aid stations?

For the 168K course: Hot food: BUZET (99. km). Drinks only: PLOMIN LUKA (16. km), MOŠĆENIČKA DRAGA (35. km), POKLON (51. km), BRGUDAC (66. km), TRSTENIK (83. km), BUTONIGA (115. km), LIVADE (131. km), GROŽNJAN (147. km), BUJE (154. km).

Is there a drop bag at Istria 100 by UTMB 2027?

Yes. On the 168K course the drop bag point is BUZET (km 99).

What are the cut-off times for the 168K at Istria 100 by UTMB 2027?

On the 168K course at Istria 100 by UTMB 2027 the finish cut-off is Sunday 14:00. Intermediate cut-offs: PLOMIN LUKA (km 16) Friday 20:00, MOŠĆENIČKA DRAGA (km 35) Saturday 00:00, POKLON (km 51) Saturday 06:00, BRGUDAC (km 66) Saturday 09:00, TRSTENIK (km 83) Saturday 14:00, BUZET (km 99) Saturday 18:00, BUTONIGA (km 115) Saturday 23:00, LIVADE (km 131) Sunday 04:00, GROŽNJAN (km 147) Sunday 08:00, BUJE (km 154) Sunday 10:00.

What are the cut-off times for the 111K at Istria 100 by UTMB 2027?

On the 111K course at Istria 100 by UTMB 2027 the finish cut-off is Sunday 11:00. Intermediate cut-offs: PRAPOĆE (km 15) Saturday 10:00, TRSTENIK (km 26) Saturday 13:00, BUZET (km 42) Saturday 17:00, BUTONIGA (km 59) Saturday 21:00, LIVADE (km 74) Sunday 01:00, GROŽNJAN (km 90) Sunday 05:00, BUJE (km 97) Sunday 07:00.

What are the cut-off times for the 69.6K at Istria 100 by UTMB 2027?

On the 69.6K course at Istria 100 by UTMB 2027 the finish cut-off is Saturday 23:59. Intermediate cut-offs: BUTONIGA (km 17) Saturday 12:30, LIVADE (km 32) Saturday 16:00, GROŽNJAN (km 48) Saturday 19:30, BUJE (km 55) Saturday 21:00.

What are the cut-off times for the 42K at Istria 100 by UTMB 2027?

On the 42K course at Istria 100 by UTMB 2027 the finish cut-off is Saturday 20:00. Intermediate cut-offs: LIVADE (km 5) Saturday 13:00, GROŽNJAN (km 21) Saturday 16:00, BUJE (km 28) Saturday 17:30.

What time does Istria 100 by UTMB 2027 start?

Known start times: 168K 17:00, 111K 07:00, 69.6K 09:00, 42K 12:00, 21.5K 10:00, local time. Confirm against the organiser's schedule in race week.

What is the time limit at Istria 100 by UTMB 2027?

The finish time limit is 168K Sunday 14:00, 111K Sunday 11:00, 69.6K Saturday 23:59, 42K Saturday 20:00, 21.5K Sunday 14:00. Intermediate stations carry their own cut-offs; the full list is in the checkpoint table on this page.

Is there a GPX file for Istria 100 by UTMB 2027?

Yes. The GPX files for the 168K, 111K, 69.6K, 42K, 21.5K courses can be downloaded from the course section on this page, next to the route and grade profile.

Which Istria 100 by UTMB course should you choose?

The shortest option is 21.5K (21.5 km, 157 m D+) and the longest is 168K (168 km, 6800 m D+). With little trail experience the 21.5K is the safer start; the 168K demands an all-day effort and cut-off management.

What are the gradients like at Istria 100 by UTMB 2027?

The 168K course averages 40 m of climbing per km, with 6621 m of total ascent and 6913 m of descent. The steepest kilometre averages 23%.

How runnable is the Istria 100 by UTMB 2027 course?

Expect a mix of running and power hiking: 40 m of gain per km; hiking the long climbs is normal, and the longest climb runs 13 km.

Where is the steepest part of Istria 100 by UTMB 2027?

The steepest kilometre of the 168K course averages 23% and sits inside the climb between km 34 and km 47.

How many climbs does Istria 100 by UTMB 2027 have?

The 168K course has 16 distinct climbs. The biggest: km 34-47 (1374 m at 11%); km 15-22 (781 m at 12%); km 5-10 (465 m at 9%).

Is there a long climb at Istria 100 by UTMB 2027?

Yes. The longest climb runs 13 km from km 34, gaining 1374 m at 11% average, topping out at 1380 m.

What are the descents like at Istria 100 by UTMB 2027?

There is 6913 m of descent in total. The longest drop runs 18.7 km between km 88 and km 106, losing 887 m.

Are there flat sections at Istria 100 by UTMB 2027?

Partly: about 30% of the course is near flat, the rest climbs or descends.

Is the hard part of Istria 100 by UTMB 2027 early or late?

The climbing is evenly split: 60% of it sits in the first half.

What is the elevation range at Istria 100 by UTMB 2027?

The lowest point of the 168K course sits at 2 m and the highest at 1386 m, a range of 1384 m. Conditions change noticeably between the two, so plan clothing in layers.

Where does Istria 100 by UTMB 2027 reach its high point?

The course tops out at 1386 m, reached around km 47.

Are poles mandatory at Istria 100 by UTMB 2027?

The organiser has not announced a pole requirement. Based on the profile poles help noticeably.

Do you need to carry water at Istria 100 by UTMB 2027?

Yes: the longest stretch without aid on the 168K course is 19.1 km, so carrying backup water is essential.