Trail du BW - 42km 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 - Trail du BW - 42km · 2026
| Aid station | Cum. km | Cum. D+ | Seg. km | Seg. D+ | Seg. D- | Crew | Cut-off | Access |
|---|---|---|---|---|---|---|---|---|
| Arrivée | 41.2 | 878 m | 41.2 | 878 m | 877 m | — | Sat 09:00 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
Trail du BW - 42km: 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 4h49 to 3h15, and the aid-station stop budget from 0h06 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 | 4h49 | 0h06 | — | 289 g | 3.4 L | 2,407 mg | +8h11 |
| 550 | 4h27 | 0h05 | — | 267 g | 3.1 L | 2,228 mg | +8h33 |
| 600 | 4h07 | 0h04 | — | 247 g | 2.9 L | 2,059 mg | +8h53 |
| 650 | 3h50 | 0h04 | — | 230 g | 2.7 L | 1,920 mg | +9h10 |
| 700 | 3h37 | 0h03 | — | 217 g | 2.5 L | 1,807 mg | +9h23 |
| 750 | 3h26 | 0h03 | — | 206 g | 2.4 L | 1,716 mg | +9h34 |
| 800 | 3h15 | 0h02 | — | 195 g | 2.3 L | 1,623 mg | +9h45 |
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
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- Kasterlee - Natuurmarathon43 km · 200 m D+ · November 15, 2026
- Vissenaken - 29km29 km · 286 m D+ · November 22, 2026
- Trail du BW - 62 km62 km · 1,207 m D+ · December 5, 2026
- Maredsous - 30km-night30 km · 682 m D+ · December 18, 2026
- Hombourg - 29km29 km · 712 m D+ · December 19, 2026
- TDLS - Ultra Trail de la Sibérie - BE - 35K35 km · 1,383 m D+ · February 20, 2027
- TDLS - Ultra Trail de la Sibérie - BE - 57K52 km · 1,646 m D+ · February 20, 2027
- TDLS - Ultra Trail de la Sibérie - BE - 42km43 km · 1,525 m D+ · February 20, 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 — Trail du BW - 42km
Weather for Trail du BW - 42km
The weather for Trail du BW - 42km 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 Trail du BW - 42km, hour by hour on the courseFrequently asked questions
How many checkpoints?
Trail du BW - 42km 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?
Trail du BW - 42km is 41 km long with 878 m of elevation gain.
How long to finish?
With a UTMB Index of 600 (average runner), the estimated time is around 4h07 for Trail du BW - 42km.
What's the weather forecast?
The weather for Trail du BW - 42km 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 Trail du BW - 42km?
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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