Lake Yahou 50k 2026
Forecast published: 55°F feels-like at the coldest, 69°F at the warmest, with rain expected.
Here you'll find the elevation profile, an estimated finish time based on your UTMB Index and details of the 5 aid stations to plan your nutrition and hydration segment by segment.
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 - Lake Yahou 50k · 2026
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
| Product | AS1km 6.1 | S/F1km 16.9 | AS2km 23.1 | S/F2km 33.8 | AS3km 40.0 |
|---|---|---|---|---|---|
| Water | available | available | available | available | available |
| Brand products | available | available | available | available | available |
Elevation profile
The course and its aid stations
Lake Yahou 50k: 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 6h37 to 4h17, and the aid-station stop budget from 0h14 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 |
|---|---|---|---|---|---|---|
| 500 | 6h37 | 0h14 | — | 397 g | 4.6 L | 3,309 mg |
| 550 | 6h09 | 0h12 | — | 369 g | 4.3 L | 3,073 mg |
| 600 | 5h36 | 0h10 | — | 336 g | 3.9 L | 2,801 mg |
| 650 | 5h14 | 0h08 | — | 314 g | 3.7 L | 2,614 mg |
| 700 | 4h52 | 0h07 | — | 292 g | 3.4 L | 2,432 mg |
| 750 | 4h34 | 0h06 | — | 274 g | 3.2 L | 2,282 mg |
| 800 | 4h17 | 0h05 | — | 257 g | 3 L | 2,139 mg |
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
- Fort Collins - Marathon43 km · 1,162 m D+ · October 18, 2026
- Bridge Burner 35mile58 km · 1,616 m D+ · October 24, 2026
- Coldwater 50k52 km · 1,293 m D+ · November 1, 2026
- Tunnel Hill 5081 km · 182 m D+ · November 7, 2026
- Mountain Masochist 5081 km · 2,311 m D+ · November 7, 2026
- Lake Chabot 50K49 km · 1,896 m D+ · November 7, 2026
- Mt. Tam 50k48 km · 2,005 m D+ · November 7, 2026
- Red Rock Canyon 50k49 km · 988 m D+ · November 14, 2026
- HOKA Pacific Trails California by UTMB - 50K®52 km · 1,548 m D+ · November 14, 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 — Lake Yahou 50k
Weather for Lake Yahou 50k
Section-by-section forecasts for Lake Yahou 50k, 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, 10/10 08:00 AM: Rain, 59°F. Coldest: 55°F feels-like at Start (Sat, 10/10 08:00 AM); warmest: 69°F at Finish (Sat, 10/10 01:36 PM). Rain expected on 6 segments, including Start, AS1, S/F1, AS2, …; up to 2.1 mm on one segment. Gusts up to 30 mph at S/F1.
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?
Lake Yahou 50k has 6 checkpoints: 5 aid stations and 1 checkpoint with undocumented contents. Details are in the two tables above.
What's the longest segment without aid?
The one leading to Finish: 11.0 km and 291 m elevation gain. That's the one to load up for first.
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?
Lake Yahou 50k is 51 km long with 1170 m of elevation gain.
How long to finish?
With a UTMB Index of 600 (average runner), the estimated time is around 5h36 for Lake Yahou 50k.
What's the weather forecast?
Forecast published: 55°F feels-like at the coldest, 69°F at the warmest, with rain expected. RAVIT publishes the weather for Lake Yahou 50k 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 Lake Yahou 50k?
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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