Istria 100 by UTMB - 110K - Elevation Profile, Aid Stations and Cutoffs
- Buzet, Croatia
- 111 km
- 4,200 m D+
- 7 aid stations
Map, checkpoints and cutoffs Map · checkpoints · forecast opens Mar 25 Race-day forecast is live
Race-day conditions
Weather, daylight and your arrival time at all 9 checkpoints, set to the 07:00 start.
- Start
- 07:00
- Daylight at the start
- 06:41-19:33
- Aid stations
- 7
Course profile
Buzet, Croatia Umag, Croatia · point-to-point
- Distance
- 111 km Finishes 72 m lower than it starts
- Elevation
- +4,200 m -4,272 m About 38 m of climb per km
- Highest point
- 1,017 m Ćićarija ridge above Trstenik
Next edition Sat 3 Apr 2027 · 07:00
- Start
- Winner ~9h27 9h27 after the start
- Sunset Umag, Croatia 12h36 after the start
- Median finisher 2026 median 18h30 after the start
- Sunrise Umag, Croatia 23h42 after the start
- Cutoff 28h after the start
A median finisher runs 5h55 in the dark.
Istria 100 by UTMB - 110K is a 111 km ultra-trail with around 4,200 m of elevation gain, starting in Buzet, Croatia. The overall cutoff is 28 hours. The highest point on the course is Ćićarija ridge above Trstenik at 1,017 m. That is 38 m of climbing per kilometre. Istria 100 by UTMB has 4 races, from 42 to 168 km; this one ranks 2 of 4 by distance and 2 of 4 by climbing per kilometre.
The biggest climb between checkpoints gains around 826 m from Buzet (km 41.93) to Butoniga (km 58.63). The steepest sustained section on the elevation profile averages about 15% over roughly 2 km around km 62. Crew access is allowed at Buzet (41.93 km) and Livade (74.14 km). Drop bags are available at Buzet.
Data is approximate and courses change between editions - always verify against the official race guide.
Other distances at Istria 100 by UTMB
| Race | Distance | D+ | Cutoff | Next start |
|---|---|---|---|---|
| Istria 168K | 168 km | 6,800 m | 45h00 | Apr 2, 2027 |
| Istria 110K (this page) | 111 km | 4,200 m | 28h00 | Apr 3, 2027 |
| Istria 69K | 69.6 km | 2,400 m | 15h00 | Apr 3, 2027 |
| Istria 42K | 42 km | 1,000 m | 8h00 | Apr 3, 2027 |
Plan against the cutoffs
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Estimate your finish
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Course math
Four numbers worked out from this course's distance, elevation and checkpoints.
TrailMath effort-km
174 effort-km
About 19 h for a mid-pack finisher (index 500). Not a pacing guarantee.
Distance + gain ÷ 100 + loss ÷ 200, beside ITRA's gain-only km-effort. Model TM1.0.
How TrailMath works →UTMB Index category
100K
153 km-effort (distance + gain ÷ 100). Calculated from the course figures, not an official classification.
Estimate your UTMB Index → ITRA and UTMB indexes explainedBiggest climb section
+826 m
Buzet → Butoniga · km 41.9–58.6
The largest gain between two checkpoints, not one continuous climb.
Buzet cutoff: Sat 17:00
Plan against barriers →Biggest descent section
−1,088 m
Trstenik → Buzet · km 26.5–41.9
The largest loss between two checkpoints. ITRA's km-effort ignores descent; TrailMath counts it: 174 km-effort.
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Istria 100 by UTMB - 110K · 2026
Finish times, 2026 edition
469 runners started. 411 came back. Half of them took longer than 18:30:13. That left the median finisher 9:29:47 inside the 28h cutoff.
Median finish
18:30:13
Half of the 411 finishers were still out there at this point.
9:29:47 in hand before the 28h cutoff
The start line
87.6%
411 of 469 starters made it; 58 did not.
still moving when a cutoff closed
stopped by choice or by the medics
Men and women
Two medians on the same scale. The bars run from the start to the cutoff, so the gap between them is the gap in time.
Men
18:25:09
median finish; average 18:39:53
328 finishers, 80% of the field
Women
18:41:06
median finish; average 18:49:58
83 finishers, 20% of the field
0:15:57 separates the two medians, across 328 men and 83 women.
Finish time by age group
Every track runs from the start to the 28h cutoff, so the empty part of a bar is the time that group's median finisher still had. Men and women are drawn on the same scale.
| Age | Median finish | Median against the cutoff | Finishers |
|---|---|---|---|
| 18-19 | - | 1 - too few finishers to publish a time | |
| 20-34 | 18:35:35 | 94 | |
| 35-39 | 17:18:20 | 78 | |
| 40-44 | 17:39:49 | 60 | |
| 45-49 | 17:43:16 | 37 | |
| 50-54 | 19:58:01 | 34 | |
| 55-59 | 18:53:39 | 15 - small sample, read with care | |
| 60-64 | 20:27:10 | 5 - small sample, read with care | |
| 65-69 | 22:40:50 | 3 - small sample, read with care | |
| 70-74 | - | 1 - too few finishers to publish a time |
| Age | Median finish | Median against the cutoff | Finishers |
|---|---|---|---|
| 20-34 | 17:36:35 | 13 - small sample, read with care | |
| 35-39 | 15:03:24 | 15 - small sample, read with care | |
| 40-44 | 18:01:53 | 24 | |
| 45-49 | 20:21:49 | 15 - small sample, read with care | |
| 50-54 | 19:54:59 | 12 - small sample, read with care | |
| 55-59 | 22:35:06 | 3 - small sample, read with care | |
| 60-64 | - | 1 - too few finishers to publish a time |
Full bar: 20 finishers or more. Tick alone: fewer than 20, too few for a median to say much. The shaded row is the biggest group.
Where the finishers came from
14% of the finishers came from Croatia alone.
| Nation | Finishers | Share |
|---|---|---|
| Croatia HR | 57 13.9% | |
| Germany DE | 41 10.0% | |
| Czechia CZ | 40 9.7% | |
| Poland PL | 33 8.0% | |
| Italy IT | 23 5.6% | |
| Austria AT | 19 4.6% | |
| France FR | 18 4.4% | |
| Romania RO | 15 3.6% | |
| Slovenia SI | 15 3.6% | |
| Slovakia SK | 15 3.6% | |
| Serbia RS | 14 3.4% | |
| Belgium BE | 11 2.7% | |
| Denmark DK | 9 2.2% | |
| Hungary HU | 9 2.2% | |
| Finland FI | 8 1.9% | |
| United States US | 8 1.9% | |
| Netherlands NL | 7 1.7% | |
| Kosovo XK | 7 1.7% | |
| Bulgaria BG | 5 1.2% | |
| Lithuania LT | 5 1.2% | |
| Sweden SE | 5 1.2% | |
| Australia AU | 4 1.0% | |
| Greece GR | 4 1.0% | |
| Ireland IE | 4 1.0% | |
| Bosnia & Herzegovina BA | 3 0.7% | |
| Canada CA | 3 0.7% | |
| Ecuador EC | 3 0.7% | |
| Spain ES | 3 0.7% | |
| United Kingdom GB | 3 0.7% | |
| North Macedonia MK | 2 0.5% | |
| Mexico MX | 2 0.5% | |
| Norway NO | 2 0.5% | |
| Portugal PT | 2 0.5% | |
| Ukraine UA | 2 0.5% | |
| Curaçao AN | 1 0.2% | |
| Bangladesh BD | 1 0.2% | |
| Switzerland CH | 1 0.2% | |
| Chile CL | 1 0.2% | |
| China CN | 1 0.2% | |
| Hong Kong SAR China HK | 1 0.2% | |
| Montenegro ME | 1 0.2% | |
| New Zealand NZ | 1 0.2% | |
| Peru PE | 1 0.2% | |
| Singapore SG | 1 0.2% | |
| 34 other nations 24 other nations 14 other nations 4 other nations | 135 32.8% 52 12.7% 18 4.4% 4 1.0% |
Showing 20 of 44 nations. Showing 30 of 44 nations. Showing 40 of 44 nations. Showing 44 of 44 nations.
Bar length is against the largest nation. The smallest counts are drawn at a minimum visible width, so their bars are not to scale.
How these numbers were computed
These are times for runners who finished. They exclude everyone who started and did not, so they describe how long finishing took, not how long the race takes. Bands with only a handful of finishers move a lot from one edition to the next.
We plot the median, not the average. A handful of very quick runners drags the average well below the time half the field actually beat, so the median is the honest number to plan against.
Nationality here shows who travels to this race, not who runs it best. That alone is why a host nation tops almost every list.
Computed from the full official results, verified October 27, 2026 - Official results
Ask the course
Ask Istria 110K anything about climbs, pacing, crew or cutoffs.
Answers come from this course's data, your plan and your training.
Which climb should I respect most?
Buzet to Butoniga: +826 m over 16.7 km, from km 41.93. Hike the steep sections at an effort you could hold for hours - the race is decided after this climb, not on it.
Where can my crew meet me?
Buzet, km 41.93 - the first of 2 crew points. The next is Livade, km 74.14. Have them bring warm layers: the course tops out at 1,017 m, through the night, in April.
Is 18h a realistic finish for me?
18h would put you in the faster half of 2026 finishers - the median was 18:30:13. It means holding 9:44/km overall.
The assistant answers that once it can see your training.
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Example answer
Your long runs peak at 30 km, so the plan builds to 4-hour long runs, two of them at night. Cutoff buffer at Butoniga: 3h49.
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~23 weeks · peak ~8 h/week · 5 run + 2 strength days
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Aid stations and checkpoints
| Checkpoint | Km | Cumulative gain (m) | Cumulative loss (m) | Cutoff |
|---|---|---|---|---|
| Start - Buzet Services not published | 0 | 0 | 0 | - |
| Prapoće | 14.8 | 724 | 270 | Sat 10:00 |
| Trstenik | 26.46 | 1,386 | 731 | Sat 13:00 |
| Buzet Crew Drop bag | 41.93 | 1,826 | 1,819 | Sat 17:00 |
| Butoniga | 58.63 | 2,652 | 2,683 | Sat 21:00 |
| Livade Crew | 74.14 | 3,344 | 3,401 | Sun 01:00 |
| Grožnjan | 89.86 | 4,073 | 3,842 | Sun 05:00 |
| Buje | 96.82 | 4,110 | 4,020 | Sun 07:00 |
| Umag (Finish) Drop bag | 111 | 4,200 | 4,272 | Sun 11:00 |
Data is approximate and courses change between editions - always verify against the official race guide. Source: official race guide, verified October 27, 2026 - Official race website
FAQ
How much elevation gain does Istria 100 by UTMB - 110K have?
Istria 100 by UTMB - 110K has around 4,200 m of cumulative elevation gain and 4,272 m of loss over 111 km.
What is the cutoff time for Istria 100 by UTMB - 110K?
The overall Istria 100 by UTMB - 110K cutoff is 28 hours, with intermediate time barriers at major checkpoints. Winning times are typically around 9 hours.
How long is Istria 100 by UTMB - 110K?
Istria 100 by UTMB - 110K covers approximately 111 km, starting in Buzet, Croatia.
What is the highest point of Istria 100 by UTMB - 110K?
The highest point of Istria 100 by UTMB - 110K is Ćićarija ridge above Trstenik at 1,017 m.
How many aid stations does Istria 100 by UTMB - 110K have and which allow crew?
The checkpoint table lists 7 major aid points between the start and the finish. Crew access is allowed at Buzet (41.93 km) and Livade (74.14 km). Drop bags are available at Buzet.
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