Trail du Lac de Villerest - Le Grand Duc 2026
Forecast published: 40°F feels-like at the coldest, 53°F at the warmest, no notable rain.
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 - Trail du Lac de Villerest - Le Grand Duc · 2026
| Aid station | Cum. km | Cum. D+ | Seg. km | Seg. D+ | Seg. D- | Crew | Cut-off | Access |
|---|---|---|---|---|---|---|---|---|
| Arrivée | 30.9 | 921 m | 30.9 | 921 m | 934 m | — | Sat 08:00 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.
Elevation profile
The course and its aid stations
Trail du Lac de Villerest - Le Grand Duc: 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 3h48 to 2h23, and the aid-station stop budget from 0h05 to 0h02. The longer the race, the more stops weigh: this is time you should plan to spend standing still, not only running.
Source
Below a UTMB® Index of roughly 550, the overall cut-off of 3h30 is no longer reachable at the estimated pace.
| UTMB® Index | Estimated time | Of which stops | Night hours | Carbs | Fluid | Sodium | Cut-off margin |
|---|---|---|---|---|---|---|---|
| 500 | 3h48 | 0h05 | — | 228 g | 2.7 L | 1,898 mg | −0h18 |
| 550 | 3h28 | 0h04 | — | 208 g | 2.4 L | 1,734 mg | +0h02 |
| 600 | 3h08 | 0h03 | — | 188 g | 2.2 L | 1,570 mg | +0h22 |
| 650 | 2h54 | 0h03 | — | 174 g | 2 L | 1,451 mg | +0h36 |
| 700 | 2h43 | 0h02 | — | 163 g | 1.9 L | 1,355 mg | +0h47 |
| 750 | 2h34 | 0h02 | — | 154 g | 1.8 L | 1,280 mg | +0h56 |
| 800 | 2h23 | 0h02 | — | 143 g | 1.7 L | 1,195 mg | +1h07 |
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.
Other trails worth preparing for
- Moontrail by RCBJ - Tour du plateau36 km · 1,081 m D+ · October 31, 2026
- COTTANCE - 20km-night20 km · 750 m D+ · October 31, 2026
- Bouaye - La Lanterne24 km · 190 m D+ · October 31, 2026
- Saint Eusèbe - Trail Panoramic27 km · 956 m D+ · October 31, 2026
- Courzieu - 25km-night25 km · 1,160 m D+ · October 31, 2026
- Estialescq - 19km19 km · 550 m D+ · October 31, 2026
- Eco Valet'Trail - 34 Km34 km · 1,454 m D+ · November 1, 2026
- Orgères - Trail court - 26 km25 km · 347 m D+ · November 1, 2026
- Saint-Just-Le-Martel - 22km22 km · 547 m D+ · November 1, 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 — Trail du Lac de Villerest - Le Grand Duc
Weather for Trail du Lac de Villerest - Le Grand Duc
Section-by-section forecasts for Trail du Lac de Villerest - Le Grand Duc, calculated at the estimated passing time: feels-like temperature, rain or snow, wind and thunderstorms. Three models — AROME (Météo-France), ICON (DWD) and ECMWF IFS — served from the finest to the farthest-reaching.
Forecasts for a 600 UTMB Index runner, at their estimated passage time. Start Sat, 11/07 04:30 PM: Clear sky, 43°F. Coldest: 40°F feels-like at Start (Sat, 11/07 04:30 PM); warmest: 53°F at Arrivée (Sat, 11/07 07:38 PM). No notable rain forecast on the course.
Forecast, not guaranteed: in the mountains a model describes a grid of several hundred meters, not the slope you're on.
Weather data: Météo-France (AROME), DWD (ICON), ECMWF (IFS) — CC BY 4.0, via Open-Meteo
Frequently asked questions
How many checkpoints?
Trail du Lac de Villerest - Le Grand Duc 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?
Trail du Lac de Villerest - Le Grand Duc is 31 km long with 921 m of elevation gain.
How long to finish?
With a UTMB Index of 600 (average runner), the estimated time is around 3h08 for Trail du Lac de Villerest - Le Grand Duc.
What's the weather forecast?
Forecast published: 40°F feels-like at the coldest, 53°F at the warmest, no notable rain. RAVIT publishes the weather for Trail du Lac de Villerest - Le Grand Duc section by section: feels-like temperature, rain or snow, wind and storms, at the estimated passage time. Forecasts come from AROME (Météo-France), ICON (DWD) and ECMWF IFS, refreshed several times a day.
Want to stack the odds in your favor for Trail du Lac de Villerest - Le Grand Duc?
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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