XTERRA O-SEE Ultra Trail - 16k 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 - 16k · 2026
| Aid station | Cum. km | Cum. D+ | Seg. km | Seg. D+ | Seg. D- | Crew | Cut-off | Access |
|---|---|---|---|---|---|---|---|---|
| Arrivée | 16.2 | 583 m | 16.2 | 583 m | 580 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 - 16k: 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 1h52 to 1h20, and the aid-station stop budget from 0h02 to 0h01. The longer the race, the more stops weigh: this is time you should plan to spend standing still, not only running.
| UTMB® Index | Estimated time | Of which stops | Night hours | Carbs | Fluid | Sodium | Cut-off margin |
|---|---|---|---|---|---|---|---|
| 500 | 1h52 | 0h02 | — | 112 g | 1.3 L | 933 mg | +4h08 |
| 550 | 1h44 | 0h02 | — | 104 g | 1.2 L | 864 mg | +4h16 |
| 600 | 1h38 | 0h02 | — | 98 g | 1.1 L | 815 mg | +4h22 |
| 650 | 1h33 | 0h01 | — | 93 g | 1.1 L | 772 mg | +4h27 |
| 700 | 1h28 | 0h01 | — | 88 g | 1 L | 736 mg | +4h32 |
| 750 | 1h24 | 0h01 | — | 84 g | 1 L | 699 mg | +4h36 |
| 800 | 1h20 | 0h01 | — | 80 g | 0.9 L | 664 mg | +4h40 |
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
- Pumpkin Hollar 25K25 km · 300 m D+ · October 17, 2026
- Fort Collins - Half Marathon22 km · 460 m D+ · October 18, 2026
- Coldwater Trail 25k25 km · 619 m D+ · November 1, 2026
- HOKA Pacific Trails California by UTMB - 25K®25 km · 667 m D+ · November 15, 2026
- Lost Lake 25K25 km · 954 m D+ · March 6, 2027
- Desert RATS Trail Running Festival - 21K21 km · 642 m D+ · April 11, 2027
- The Canyons Endurance Runs - 25K25 km · 810 m D+ · April 23, 2027
- Sonoma Coast Half Marathon21 km · 895 m D+ · May 29, 2027
- Pepsi Challenge 25K25 km · 456 m D+ · June 6, 2027
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 - 16k
Weather for XTERRA O-SEE Ultra Trail - 16k
Section-by-section forecasts for XTERRA O-SEE Ultra Trail - 16k, 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 - 16k 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 - 16k is 16 km long with 583 m of elevation gain.
How long to finish?
With a UTMB Index of 600 (average runner), the estimated time is around 1h38 for XTERRA O-SEE Ultra Trail - 16k.
What's the weather forecast?
RAVIT publishes the weather for XTERRA O-SEE Ultra Trail - 16k 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 - 16k?
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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