Gran Trail Courmayeur - GTC100 - Elevation Profile, Aid Stations and Cutoffs
- Courmayeur, Valle d'Aosta, Italy
- 103 km64 mi
- 7,400 m24,278 ft D+
- 13 aid stations
- 5 ITRA points
Map, checkpoints and cutoffs Map · checkpoints · forecast opens Jun 30 Race-day forecast is live
Race-day conditions
Weather and daylight along the course and at all 15 checkpoints, set to the 22:00 start.
- Start
- 22:00
- Daylight at the start
- 05:51-21:23
- Aid stations
- 13
Course profile
Courmayeur, Valle d'Aosta, ItalyCourmayeur, Valle d'Aosta, Italy· point-to-point
Download the official GPX- Distance
- 103 km64 miFinishes 5 m lower than it startsFinishes 16 ft lower than it starts
- Elevation
- +7,400 m+24,278 ft-7,405 m-24,295 ftAbout 72 m of climb per kmAbout 379 ft of climb per mile
- Highest point
- 2,830 m9,285 ftMont Nix
- Days and nights
- 2 days1 nightFor a median finisher (25h)
Next editionEst. Fri 9 Jul 2027
Our estimate for Fri 9 Jul 2027. The organiser has not announced the date for this race yet.
- Start
- SunriseCourmayeur, Valle d'Aosta, Italy7h52 after the start
- Winner~15h2015h20 after the start
- SunsetCourmayeur, Valle d'Aosta, Italy23h23 after the start
- Median finisher2026 median25h after the start
- Cutoff33h after the start
A median finisher runs 9h29 in the dark.
Gran Trail Courmayeur - GTC100 is a 103 km ultra-trail with around 7,400 m of elevation gain, starting in Courmayeur, Valle d'Aosta, Italy. The overall cutoff is 33 hours. The highest point on the course is Mont Nix at 2,830 m. That is 72 m of climbing per kilometre. Gran Trail Courmayeur has 3 races, from 26.1 to 103 km; this one ranks 1 of 3 by distance and 2 of 3 by climbing per kilometre.
The biggest climb between checkpoints gains around 1,301 m from Arpy (km 12.67) to Rifugio Deffeyes (km 24.78). The steepest sustained section on the elevation profile averages about 26% over roughly 2.7 km around km 76. Crew access is allowed at Arpy (12.67 km), Rifugio Deffeyes (24.78 km), La Thuile (34.18 km), Youlaz (40.42 km), Mont Fortin (49.95 km), Lago Combal (61.4 km), Rifugio Maison Vieille (70.06 km), Skyway Pavillon du Mont Fréty (life base) (78.02 km), Rifugio Bonatti (89.87 km) and Currù (97.26 km). Drop bags are available at Skyway Pavillon du Mont Fréty (life base).
Data is approximate and courses change between editions - always verify against the official race guide.
Other distances at Gran Trail Courmayeur
Plan against the cutoffs
Prepare every aid station against the official cutoffs, then unlock your full roadbook in the app.
Estimate your finish
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Course math
Four numbers worked out from this course's distance, elevation and checkpoints.
TrailMath effort-km
214 effort-km
About 26 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
100M
177 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
+1,301 m+4,268 ft
Arpy → Rifugio Deffeyes · km 12.7–24.8mi 7.9–15.4
The largest gain between two checkpoints, not one continuous climb.
Arpy cutoff: Sat 01:00
Plan against barriers →Biggest descent section
−1,161 m−3,809 ft
Rifugio Deffeyes → La Thuile · km 24.8–34.2mi 15.4–21.2
The largest loss between two checkpoints. ITRA's km-effort ignores descent; TrailMath counts it: 214 km-effort.
Open in GPX Explorer →Share this race
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Gran Trail Courmayeur - GTC100 · 2026
Finish times, 2026 edition
660 runners started. 425 came back. Half of them took longer than 25:00:00.That left the median finisher 8:00:00 inside the 33h cutoff.
Median finish
25:00:00
Half of the 425 finishers were still out there at this point.
8:00:00in hand before the 33h cutoff
The start line
64.4%
425 of 660 starters made it; 235 did not.
still moving when a cutoff closed
stopped by choice or by the medics
Organisation stops and disqualifications: 235.
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
24:51:11
median finish; average 24:57:14
374 finishers, 88% of the field
Women
26:31:33
median finish; average 25:56:31
51 finishers, 12% of the field
1:40:22 separates the two medians, across 374 men and 51 women.
Finish time by age group
Every track runs from the start to the 33h 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 |
|---|---|---|---|
| SEN | 22:38:21 | 97 | |
| V1 | 24:05:21 | 141 | |
| V2 | 26:27:02 | 107 | |
| V3 | 28:49:54 | 28 | |
| V4 | - | 1 - too few finishers to publish a time |
| Age | Median finish | Median against the cutoff | Finishers |
|---|---|---|---|
| SEN | 21:55:46 | 10 - small sample, read with care | |
| V1 | 26:31:05 | 22 | |
| V2 | 27:29:20 | 19 - small sample, read with care |
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
52% of the finishers came from Italy alone.
| Nation | Finishers | Share |
|---|---|---|
| ItalyIT | 22051.8% | |
| FranceFR | 7818.4% | |
| BelgiumBE | 429.9% | |
| United KingdomGB | 122.8% | |
| United StatesUS | 102.4% | |
| FinlandFI | 92.1% | |
| NetherlandsNL | 92.1% | |
| SwitzerlandCH | 81.9% | |
| GermanyDE | 71.6% | |
| SloveniaSI | 61.4% | |
| PolandPL | 51.2% | |
| IrelandIE | 20.5% | |
| RomaniaRO | 20.5% | |
| South AfricaZA | 20.5% | |
| ArgentinaAR | 10.2% | |
| AustriaAT | 10.2% | |
| BrazilBR | 10.2% | |
| CanadaCA | 10.2% | |
| EcuadorEC | 10.2% | |
| SpainES | 10.2% | |
| GreeceGR | 10.2% | |
| HungaryHU | 10.2% | |
| IsraelIL | 10.2% | |
| MoroccoMA | 10.2% | |
| PortugalPT | 10.2% | |
| RussiaRU | 10.2% | |
| San MarinoSM | 10.2% | |
| 17 other nations7 other nations | 245.6%71.6% |
Showing 20 of 27 nations.Showing 27 of 27 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, verifiedNovember 4, 2026 - Official results
Ask the course
Ask GTC100 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?
Arpy to Rifugio Deffeyes: +1,301 m over 12.1 km, from km 12.67. 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?
Arpy, km 12.67 - the first of 10 crew points. The next is Rifugio Deffeyes, km 24.78. Have them bring warm layers: the course tops out at 2,830 m, through the night, in July.
Is 25h a realistic finish for me?
25h would put you in the faster half of 2026 finishers - the median was 25:00:00. It means holding 14:34/km overall.
The assistant answers that once it can see your training.
Build your GTC100 plan and your question is the first thing waiting in the TrailMath Assistant.
Build my GTC100 planYearly has a 7-day free trial for eligible customers, or take a Race Pass for this race.
To answer this for you, the Course Assistant uses your training and your race plan.
Example answer
Your long runs peak at 30 km, so the plan builds to 4-hour long runs, two of them at night.
Yearly has a 7-day free trial for eligible customers, or take a Race Pass for this race.
Try asking GTC100
Ask anything - we'll open your GTC100 plan with your question ready.
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See your training shape
Pick your weekly volume and training days to preview the plan structure - no account needed.
~36 weeks · peak ~8 h/week · 5 run + 2 strength days
For a 103 km race, aim for about 12 h/week at peak. Set your availability to 14 h/week in the app for the headroom to build there gradually.
Typical structure for your volume - your live plan adjusts sessions inside each week.
Make this your plan
Create your account to see the full week-by-week plan, then choose how to unlock it.
Aid stations and checkpoints
| Checkpoint | KmMi | Cumulative gain (m)Cumulative gain (ft) | Cumulative loss (m)Cumulative loss (ft) | Cutoff |
|---|---|---|---|---|
| Start - CourmayeurServices not published | 00 | 00 | 00 | - |
| ArpyCrew | 12.677.9 | 9122,992 | 4391,440 | Sat 01:00 |
| Rifugio DeffeyesCrew | 24.7815.4 | 2,2137,260 | 9423,091 | - |
| La ThuileCrew | 34.1821.2 | 2,3467,697 | 2,1036,900 | - |
| YoulazCrew | 40.4225.1 | 2,9989,836 | 2,1877,175 | Sat 09:30 |
| Mont FortinCrew | 49.9531 | 4,09213,425 | 2,5558,383 | - |
| Casermetta (Val Veny) | 57.6935.8 | 4,29114,078 | 3,15110,338 | - |
| Lago CombalCrew | 61.438.2 | 4,29114,078 | 3,54111,617 | Sat 15:30 |
| Rifugio Maison VieilleCrew | 70.0643.5 | 4,79515,732 | 4,06013,320 | - |
| Brenva | 74.5946.3 | 4,83515,863 | 4,68015,354 | Sat 19:00 |
| Skyway Pavillon du Mont Fréty (life base)CrewDrop bag | 78.0248.5 | 5,65418,550 | 4,72415,499 | Sat 21:30 |
| Rifugio BonattiCrew | 89.8755.8 | 6,52021,391 | 5,71218,740 | Sun 02:00 |
| Col Sapin | 95.5359.4 | 7,19623,609 | 5,97119,590 | - |
| CurrùCrew | 97.2660.4 | 7,23523,737 | 6,43021,096 | Sun 05:30 |
| Courmayeur (Finish)Crew | 10364 | 7,40024,278 | 7,40524,295 | Sun 07:00 |
Data is approximate and courses change between editions - always verify against the official race guide. Source: official race guide, verifiedNovember 4, 2026 - Official race website
FAQ
How much elevation gain does Gran Trail Courmayeur - GTC100 have?
Gran Trail Courmayeur - GTC100 has around 7,400 m of cumulative elevation gain and 7,405 m of loss over 103 km.
What is the cutoff time for Gran Trail Courmayeur - GTC100?
The overall Gran Trail Courmayeur - GTC100 cutoff is 33 hours, with intermediate time barriers at major checkpoints. Winning times are typically around 15 hours.
How long is Gran Trail Courmayeur - GTC100?
Gran Trail Courmayeur - GTC100 covers approximately 103 km, starting in Courmayeur, Valle d'Aosta, Italy.
What is the highest point of Gran Trail Courmayeur - GTC100?
The highest point of Gran Trail Courmayeur - GTC100 is Mont Nix at 2,830 m.
How many aid stations does Gran Trail Courmayeur - GTC100 have and which allow crew?
The checkpoint table lists 13 major aid points between the start and the finish. Crew access is allowed at Arpy (12.67 km), Rifugio Deffeyes (24.78 km), La Thuile (34.18 km), Youlaz (40.42 km), Mont Fortin (49.95 km), Lago Combal (61.4 km), Rifugio Maison Vieille (70.06 km), Skyway Pavillon du Mont Fréty (life base) (78.02 km), Rifugio Bonatti (89.87 km) and Currù (97.26 km). Drop bags are available at Skyway Pavillon du Mont Fréty (life base).
Training for this race?
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