LE GRAND TRAIL DE L'OUEST - GTO 50 2027
The forecast arrives five days before the start.
Here you'll find the elevation profile and an estimated finish time based on your UTMB Index.
What's your time based on your UTMB?
Times estimated by the RAVIT model, learned from real ultra-trail finish times. Enter your UTMB Index (utmb.world) to get a personalized estimate.
Cut-off times and crew - LE GRAND TRAIL DE L'OUEST - GTO 50 · 2027
| Aid station | Cum. km | Cum. D+ | Seg. km | Seg. D+ | Seg. D- | Crew | Cut-off | Access |
|---|---|---|---|---|---|---|---|---|
| Arrivée | 48.4 | 2,072 m | 48.4 | 2,072 m | 2,073 m | — | Sat 07:00 PM |
Data from the official race rules, checked for every edition. The race rules prevail. Positions are interpolated along the GPX track and are a guide, not official course marking.
What you'll find at each aid station
Aid station contents not documented.
La feuille de ton assistance pour LE GRAND TRAIL DE L'OUEST - GTO 50 · 2027
Les règles d'assistance de cette course ne sont pas encore connues : tu marqueras tes rendez-vous toi-même.
Recto, verso et planche d'étiquettes, en PDF : l'exemple d'une coureuse de l'UTMB.
Elevation profile
The course and its aid stations
LE GRAND TRAIL DE L'OUEST - GTO 50: times, aid-station stops and fuelling needs by UTMB® Index
Between a UTMB® Index of 500 and 800, the estimated finish time on this race runs from 7h48 to 4h30, and the aid-station stop budget from 0h17 to 0h05. The longer the race, the more stops weigh: this is time you should plan to spend standing still, not only running.
Source
| UTMB® Index | Estimated time | Of which stops | Night hours | Carbs | Fluid | Sodium | Cut-off margin |
|---|---|---|---|---|---|---|---|
| 500 | 7h48 | 0h17 | 3 | 468 g | 5.5 L | 3,896 mg | +7h12 |
| 550 | 6h58 | 0h13 | 3 | 418 g | 4.9 L | 3,484 mg | +8h02 |
| 600 | 6h08 | 0h11 | 3 | 368 g | 4.3 L | 3,064 mg | +8h52 |
| 650 | 5h36 | 0h09 | 3 | 336 g | 3.9 L | 2,802 mg | +9h24 |
| 700 | 5h09 | 0h07 | 3 | 309 g | 3.6 L | 2,574 mg | +9h51 |
| 750 | 4h50 | 0h06 | 3 | 290 g | 3.4 L | 2,413 mg | +10h10 |
| 800 | 4h30 | 0h05 | 3 | 270 g | 3.2 L | 2,253 mg | +10h30 |
Figures based on 60 g of carbohydrate, 700 mL of fluid and 500 mg of sodium per hour, "average" preparation and mild conditions (15–25 °C). Above 25 °C, count on roughly 900 mL/h and 700 mg/h. Carbohydrate intake is trained: 60 g/h is a floor, 90 g/h assumes a glucose-fructose blend and a gut used to it.
In the 2027 ranking
LE GRAND TRAIL DE L'OUEST - GTO 50 is 48 km and 2,072 m of elevation gain, that's 69 km-effort: category S, among 163 races in 2027. Its time limit of 15 h requires a minimum speed of 3.2 km/h: rank 11 out of 145 of the widest cut-off times in S.
S trails 2027: 45 to 74 km-effort
Similar effort in 2027
- Trails de la Truyère - Les Barrages - Relais · 69 km-effort
- Trails de la Truyère - Les Barrages · 69 km-effort
- Marbella Epic Trail - Destroyer · 69 km-effort
Other trails worth preparing for
- Moontrail by RCBJ - Tour du plateau36 km · 1,081 m D+ · October 31, 2026
- Eco Valet'Trail - 34 Km34 km · 1,454 m D+ · November 1, 2026
- Urban Trail des 3 Panoramas de Rouen - UT3PR 72 KM71 km · 1,438 m D+ · November 1, 2026
- Moulidars - 41km41 km · 1,100 m D+ · November 1, 2026
- Urban Trail des 3 Panoramas de Rouen - UT3PR 42,2 KM MARATRAIL42 km · 1,082 m D+ · November 1, 2026
- Trail du Lac de Villerest - Le Grand Duc31 km · 921 m D+ · November 7, 2026
- Boën-sur-Lignon - 30km30 km · 1,250 m D+ · November 7, 2026
- Liévin - 36km-night35 km · 594 m D+ · November 7, 2026
- Trail du Lac de Villerest - Le Tour du Lac42 km · 1,196 m D+ · November 7, 2026
Sources and method
- Time projection — times by UTMB Index are taken from the actual splits of runners in each level band on previous editions of this race, aid station stops included. No formula is used as long as these results exist.
- Trail nutrition — hourly targets for carbohydrate, fluid and sodium follow the commonly accepted ultra-endurance guidance. La Clinique du Coureur — Fuelling in trail running
- Course, aid stations and cut-offs — taken from the event's official rules, which prevail in case of any discrepancy. Official site — LE GRAND TRAIL DE L'OUEST - GTO 50
Weather for LE GRAND TRAIL DE L'OUEST - GTO 50
The weather for LE GRAND TRAIL DE L'OUEST - GTO 50 will appear here as soon as the forecast models reach that date, around five days before the start: feels-like temperature, rain, snow, wind and storms, section by section and at your passage time.
Detailed weather for LE GRAND TRAIL DE L'OUEST - GTO 50, hour by hour on the courseFrequently asked questions
How many checkpoints?
LE GRAND TRAIL DE L'OUEST - GTO 50 has 1 checkpoint: 1 checkpoint with undocumented contents. Details are in the two tables above.
How do I find the exact location of an aid station?
The Google Maps icon in the “Access” column opens the aid station's location: handy for planning your crew's routes.
What distance and elevation gain?
LE GRAND TRAIL DE L'OUEST - GTO 50 is 48 km long with 2072 m of elevation gain.
How long to finish?
With a UTMB Index of 600 (average runner), the estimated time is around 6h08 for LE GRAND TRAIL DE L'OUEST - GTO 50.
What's the weather forecast?
The weather for LE GRAND TRAIL DE L'OUEST - GTO 50 will be published on this page around five days before the start, once the forecast models reach the race date. It will be detailed section by section: feels-like temperature, rain, snow, wind and storms.
Want to stack the odds in your favor for LE GRAND TRAIL DE L'OUEST - GTO 50?
In 2 minutes, RAVIT generates your complete plan: segment-by-segment time, carbs, water and sodium at every aid station, printable roadbook.
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