Ultra Running Hub Chaumont-Gistoux, Belgium · Saturday, December 5, 2026
Trail du BW - 100km
What the course asks
Typical conditions, December
Regional 2001-2020 average for December — NASA POWER, grid elevation 177 m. Not a forecast.
Course notes
- terrain This is a rolling course. Expect fast, runnable sections where rhythm is key.
- gear With trail terrain, choose a shoe with moderate cushioning for optimal performance.
- nutrition For 100km+ efforts, prioritize real food at aid stations to prevent palate fatigue.
Gear for this race
Chosen for 100 km of trail with 1,780 m of ascent.
- Trail Running Shoes 100 km of trail — cushioning that is still there in the last quarter.
- Race Nutrition Past 100 km the palate quits before the legs do — carry more than one flavour.
- Hydration Vests Flask capacity for 100 km, without the bounce.
- Headlamps A 17 h limit puts you out there after dark.
- Accessories Chafe and blisters end more 100 km races than fitness does.
Overview
Organised by Blancs Gilets, the Trail du BW - 100km takes place in Chaumont-Gistoux, Belgium, this December. With 17.8 metres of climb per kilometre across its 100-kilometre course, the rolling terrain totals 1780 metres of elevation gain without presenting extreme mountain grades.
A 17-hour time limit demands a minimum pace of 10.2 minutes per kilometre. Out of 224 peer events in the 100k category, this time allowance sits right in the middle—tighter than 50% of 100k cut-offs and more generous than 50%—requiring a steady, consistent rhythm without demanding aggressive speed. At an entry fee of 52€, it offers an accessible late-season ultra target.
Similar races
Other 100K trail ultras, closest in distance first.