Ottsjö - Fjällmarathon 100K 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 - Ottsjö - Fjällmarathon 100K · 2026
| Aid station | Cum. km | Cum. D+ | Seg. km | Seg. D+ | Seg. D- | Crew | Cut-off | Access |
|---|---|---|---|---|---|---|---|---|
| Arrivée | 100.4 | 3,341 m | 100.4 | 3,341 m | 3,310 m | — | — | — |
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
Ottsjö - Fjällmarathon 100K: 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 16h17 to 9h29, and the aid-station stop budget from 0h47 to 0h17. 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 | 16h17 | 0h47 | 2.3 | 977 g | 11.4 L | 8,143 mg |
| 550 | 14h46 | 0h38 | 2 | 886 g | 10.3 L | 7,385 mg |
| 600 | 13h07 | 0h31 | 2 | 787 g | 9.2 L | 6,562 mg |
| 650 | 12h04 | 0h27 | 2 | 724 g | 8.4 L | 6,029 mg |
| 700 | 11h04 | 0h23 | 2 | 664 g | 7.7 L | 5,535 mg |
| 750 | 10h11 | 0h20 | 2 | 611 g | 7.1 L | 5,091 mg |
| 800 | 9h29 | 0h17 | 2 | 569 g | 6.6 L | 4,738 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
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 — Ottsjö - Fjällmarathon 100K
Weather for Ottsjö - Fjällmarathon 100K
The weather for Ottsjö - Fjällmarathon 100K 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 Ottsjö - Fjällmarathon 100K, hour by hour on the courseFrequently asked questions
How many checkpoints?
Ottsjö - Fjällmarathon 100K has 1 checkpoint: 1 checkpoint with undocumented contents. Details are in the two tables above.
What distance and elevation gain?
Ottsjö - Fjällmarathon 100K is 100 km long with 3341 m of elevation gain.
How long to finish?
With a UTMB Index of 600 (average runner), the estimated time is around 13h07 for Ottsjö - Fjällmarathon 100K.
What's the weather forecast?
The weather for Ottsjö - Fjällmarathon 100K 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 Ottsjö - Fjällmarathon 100K?
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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