Gran Trail Courmayeur - GTC100 course and race-day weather
- Courmayeur, Valle d'Aosta, Italy
- 103 km64 mi
- 7,400 m24,278 ft D+
- 13 aid stations
- 5 ITRA points
Analyzing route...
GTC100 course, section by section
The GTC100 course runs 103.0 km with 7,400 m of climbing and 7,405 m of descent - 72 m of climbing per kilometre. It tops out at 2,830 m, and its lowest point on the GPX is 1,015 m. 44% of the distance climbs at more than 3%, 40% descends at more than 3%, and the remaining 16% is flat or rolling.The GTC100 course runs 64.0 mi with 24,278 ft of climbing and 24,295 ft of descent - 379 ft of climbing per mile. It tops out at 9,285 ft, and its lowest point on the GPX is 3,330 ft. 44% of the distance climbs at more than 3%, 40% descends at more than 3%, and the remaining 16% is flat or rolling.
The organiser's 15 checkpoints split the course into 14 sections. The table gives each leg's own climb, descent, average grade and high point, measured on the official GPX.
Download the official GPX| Section | KmMi | Distance | D+ | D- | Avg grade | High point |
|---|---|---|---|---|---|---|
| Start - Courmayeur → Arpy | 0.0-12.70.0-7.9 | 12.7 km7.9 mi | +902 m+2,959 ft | -434 m-1,424 ft | +3.7% | 1,701 m5,581 ft |
| Arpy → Rifugio Deffeyes | 12.7-24.87.9-15.4 | 12.1 km7.5 mi | +1,285 m+4,216 ft | -500 m-1,640 ft | +6.5% | 2,500 m8,202 ft |
| Rifugio Deffeyes → La Thuile | 24.8-34.215.4-21.2 | 9.4 km5.8 mi | +131 m+430 ft | -1,144 m-3,753 ft | -10.8% | 2,492 m8,176 ft |
| La Thuile → Youlaz | 34.2-40.421.2-25.1 | 6.2 km3.9 mi | +646 m+2,119 ft | -83 m-272 ft | +9.1% | 2,053 m6,736 ft |
| Youlaz → Mont Fortin | 40.4-50.025.1-31.0 | 9.5 km5.9 mi | +1,080 m+3,543 ft | -364 m-1,194 ft | +7.5% | 2,867 m9,406 ft |
| Mont Fortin → Casermetta (Val Veny) | 50.0-57.731.0-35.8 | 7.7 km4.8 mi | +197 m+646 ft | -592 m-1,942 ft | -5.1% | 2,750 m9,022 ft |
| Casermetta (Val Veny) → Lago Combal | 57.7-61.435.8-38.2 | 3.7 km2.3 mi | +0 m+0 ft | -382 m-1,253 ft | -10.3% | 2,357 m7,733 ft |
| Lago Combal → Rifugio Maison Vieille | 61.4-70.138.2-43.5 | 8.7 km5.4 mi | +499 m+1,637 ft | -512 m-1,680 ft | -0.1% | 2,436 m7,992 ft |
| Rifugio Maison Vieille → Brenva | 70.1-74.643.5-46.3 | 4.5 km2.8 mi | +44 m+144 ft | -614 m-2,014 ft | -12.6% | 1,964 m6,444 ft |
| Brenva → Skyway Pavillon du Mont Fréty (life base) | 74.6-78.046.3-48.5 | 3.4 km2.1 mi | +805 m+2,641 ft | -53 m-174 ft | +21.9% | 2,173 m7,129 ft |
| Skyway Pavillon du Mont Fréty (life base) → Rifugio Bonatti | 78.0-89.948.5-55.8 | 11.9 km7.4 mi | +856 m+2,808 ft | -967 m-3,173 ft | -0.9% | 2,143 m7,031 ft |
| Rifugio Bonatti → Col Sapin | 89.9-95.555.8-59.4 | 5.7 km3.5 mi | +667 m+2,188 ft | -257 m-843 ft | +7.2% | 2,529 m8,297 ft |
| Col Sapin → Currù | 95.5-97.359.4-60.4 | 1.7 km1.1 mi | +40 m+131 ft | -461 m-1,512 ft | -24.3% | 2,442 m8,012 ft |
| Currù → Courmayeur (Finish) | 97.3-103.060.4-64.0 | 5.7 km3.5 mi | +162 m+531 ft | -957 m-3,140 ft | -13.8% | 2,021 m6,631 ft |
The climbs that shape the race
The track holds 7 major climbs and 7 major descents. The biggest climb runs from km 35 to km 47 (through Youlaz): +1,507 m over 11.6 km at an average of 12.1%. The steepest sustained climb averages 23.6% over 3.3 km from km 75 (Brenva to Skyway Pavillon du Mont Fréty (life base)), with pitches of 40.3%. 3 of the major climbs start in the last 30% of the course. The longest descent drops 1,198 m over 10.5 km from km 24 (through La Thuile), at an average of 10.1%.The track holds 7 major climbs and 7 major descents. The biggest climb runs from mile 22 to mile 29 (through Youlaz): +4,944 ft over 7.2 mi at an average of 12.1%. The steepest sustained climb averages 23.6% over 2.0 mi from mile 46 (Brenva to Skyway Pavillon du Mont Fréty (life base)), with pitches of 40.3%. 3 of the major climbs start in the last 30% of the course. The longest descent drops 3,930 ft over 6.5 mi from mile 15 (through La Thuile), at an average of 10.1%.
Distance, total climb and high point are the organiser's. Each section's climb, descent, grade and high point, the low point and the named climbs are measured on the official GPX with the same method as the interactive profile, so the sections can add up to a slightly different total.