XTERRA O-SEE Ultra Trail - 50k Team Duo 2026
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 - XTERRA O-SEE Ultra Trail - 50k Team Duo · 2026
| Aid station | Cum. km | Cum. D+ | Seg. km | Seg. D+ | Seg. D- | Crew | Cut-off | Access |
|---|---|---|---|---|---|---|---|---|
| Arrivée | 50.8 | 2,167 m | 50.8 | 2,167 m | 2,165 m | — | Sat 06:00 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
XTERRA O-SEE Ultra Trail - 50k Team Duo: 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 6h51 to 4h30, and the aid-station stop budget from 0h15 to 0h05. The longer the race, the more stops weigh: this is time you should plan to spend standing still, not only running.
Below a UTMB® Index of roughly 320, the overall cut-off of 10h00 is no longer reachable at the estimated pace.
| UTMB® Index | Estimated time | Of which stops | Night hours | Carbs | Fluid | Sodium | Cut-off margin |
|---|---|---|---|---|---|---|---|
| 500 | 6h51 | 0h15 | — | 411 g | 4.8 L | 3,423 mg | +3h09 |
| 550 | 6h21 | 0h12 | — | 381 g | 4.4 L | 3,174 mg | +3h39 |
| 600 | 5h52 | 0h10 | — | 352 g | 4.1 L | 2,936 mg | +4h08 |
| 650 | 5h29 | 0h09 | — | 329 g | 3.8 L | 2,746 mg | +4h31 |
| 700 | 5h06 | 0h07 | — | 306 g | 3.6 L | 2,552 mg | +4h54 |
| 750 | 4h47 | 0h06 | — | 287 g | 3.4 L | 2,393 mg | +5h13 |
| 800 | 4h30 | 0h05 | — | 270 g | 3.1 L | 2,248 mg | +5h30 |
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
- Elk-King 50K48 km · 1,943 m D+ · October 17, 2026
- Man against horse77 km · 1,910 m D+ · October 17, 2026
- Wild Duluth 50K48 km · 1,511 m D+ · October 17, 2026
- Lake Sonoma 5081 km · 2,922 m D+ · October 17, 2026
- Fort Collins - Marathon43 km · 1,162 m D+ · October 18, 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
Sources and method
- Time projection — les temps par cote sont repris des passages réels des coureurs de chaque tranche sur les éditions précédentes de cette course, arrêts aux ravitaillements compris. Aucune formule n'intervient tant que ces résultats existent.
- 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 — XTERRA O-SEE Ultra Trail - 50k Team Duo
Weather for XTERRA O-SEE Ultra Trail - 50k Team Duo
Section-by-section forecasts for XTERRA O-SEE Ultra Trail - 50k Team Duo, 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.
Forecast, not guaranteed: in the mountains a model describes a grid of several hundred meters, not the slope you're on.
Données météo : Météo-France (AROME), DWD (ICON), ECMWF (IFS) — CC BY 4.0, via Open-Meteo
Frequently asked questions
How many checkpoints?
XTERRA O-SEE Ultra Trail - 50k Team Duo 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?
XTERRA O-SEE Ultra Trail - 50k Team Duo is 51 km long with 2167 m of elevation gain.
How long to finish?
With a UTMB Index of 600 (average runner), the estimated time is around 5h52 for XTERRA O-SEE Ultra Trail - 50k Team Duo.
What's the weather forecast?
RAVIT publishes the weather for XTERRA O-SEE Ultra Trail - 50k Team Duo 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 XTERRA O-SEE Ultra Trail - 50k Team Duo?
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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