Les Défis des Chalets - Défi 25k 2026
The forecast arrives five days before the start.
Here you'll find the elevation profile, an estimated finish time based on your UTMB Index and details of the 3 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 - Les Défis des Chalets - Défi 25k · 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 | km 7.5km 7.5 | km 11.1km 11.1 | km 17.6km 17.6 |
|---|---|---|---|
| Water | available | available | available |
| Brand products | available | unavailable | available |
Elevation profile
The course and its aid stations
Les Défis des Chalets - Défi 25k: 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 3h41 to 2h30, 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
| UTMB® Index | Estimated time | Of which stops | Night hours | Carbs | Fluid | Sodium | Cut-off margin |
|---|---|---|---|---|---|---|---|
| 500 | 3h41 | 0h05 | — | 221 g | 2.6 L | 1,842 mg | +5h49 |
| 550 | 3h23 | 0h04 | — | 203 g | 2.4 L | 1,689 mg | +6h07 |
| 600 | 3h09 | 0h03 | — | 189 g | 2.2 L | 1,575 mg | +6h21 |
| 650 | 2h58 | 0h03 | — | 178 g | 2.1 L | 1,482 mg | +6h32 |
| 700 | 2h48 | 0h02 | — | 168 g | 2 L | 1,401 mg | +6h42 |
| 750 | 2h40 | 0h02 | — | 160 g | 1.9 L | 1,333 mg | +6h50 |
| 800 | 2h30 | 0h02 | — | 150 g | 1.7 L | 1,249 mg | +7h00 |
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
- Ascona-Locarno - 24K25 km · 1,353 m D+ · October 24, 2026
- Fribourg - 34km-night34 km · 1,072 m D+ · December 12, 2026
- Les Courses du Mont-Terrible - Relais 70K - Relais 237 km · 1,945 m D+ · April 17, 2027
- Les Courses du Mont-Terrible - Relais 70K - Relais 135 km · 1,909 m D+ · April 17, 2027
- Les Courses du Mont-Terrible - La Terrible23 km · 947 m D+ · April 17, 2027
- Les Courses du Mont-Terrible - La Brère - 15K15 km · 733 m D+ · April 18, 2027
- Les Courses du Mont-Terrible - Trail de Pietchiesson36 km · 1,593 m D+ · April 18, 2027
- Trail Noble Contree - Trail NBC26 km · 1,431 m D+ · May 1, 2027
- Morobbia Trail - Trail del Lupo K33 2500m D+33 km · 2,568 m D+ · May 15, 2027
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 — Les Défis des Chalets - Défi 25k
Weather for Les Défis des Chalets - Défi 25k
The weather for Les Défis des Chalets - Défi 25k 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 Les Défis des Chalets - Défi 25k, hour by hour on the courseFrequently asked questions
How many checkpoints?
Les Défis des Chalets - Défi 25k has 4 checkpoints: 2 aid stations, 1 water point, and 1 checkpoint with undocumented contents. Details are in the two tables above.
What's the longest segment without aid?
The one leading to Ravitaillement km 7.5: 7.5 km and 900 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?
Les Défis des Chalets - Défi 25k is 24 km long with 1872 m of elevation gain.
How long to finish?
With a UTMB Index of 600 (average runner), the estimated time is around 3h09 for Les Défis des Chalets - Défi 25k.
What's the weather forecast?
The weather for Les Défis des Chalets - Défi 25k 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 Les Défis des Chalets - Défi 25k?
In 2 minutes, RAVIT generates your complete plan: segment-by-segment time, carbs, water and sodium at every aid station, printable roadbook.
No card required · Instant results