Chaumont-Gistoux, Belgium · Sunday, December 6, 2026

Fixed Distance 50 mi

Trail du BW - 84km

36 days away

85 km Distance

1,550 m Climbing

6.6 Grit · Hardcore

50.6775° N, 4.7212° E © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Climbing rate 18 m / km Rolling. Moderate undulations. Requires consistent effort across varying grades.

Time limit 12 hours 8:28 min/km average. Tight. Sustained running. Long aid-station stops will cost you. Among the tightest 50 mi cut-offs we track. Measured against 482 races of the same distance. Cut-off calculator →

Field size ~64 Mid-sized. Company early, well spread out by halfway.

DUV results for the 2025 edition (84km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, December

Daytime high 5°C

Night low 0°C

Rainfall Mostly dry

Daylight 8 h 11 m of light

Regional 2001-2020 average for December — NASA POWER, grid elevation 177 m. Not a forecast.

Results history

Year	Race	Finishers	Men's winner	Women's winner
2025	84km	64	Philip van Hemelen · 07:15:32	Jil Gillen · 07:58:29
2023	84km	43	Sven Vanbaelen · 06:19:21	Pauline Thinus · 08:44:09

The field grew 49% between 2023 (43) and 2025 (64). 14% of the 2025 field were women.

DUV results for the 2025 edition (84km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

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.

Gear for this race

Chosen for 85 km of trail with 1,550 m of ascent.

Trail Running Shoes 85 km of trail — cushioning that is still there in the last quarter.
Race Nutrition 85 km of self-supported fuelling between aid stations.
Hydration Vests Flask capacity for 85 km, without the bounce.
Headlamps A 12 h limit puts you out there after dark.
GPS Watches Battery life first — a 85 km day outlasts most full-GPS modes.

La Sportiva

Prodigio Pro

RunRepeat found the La Sportiva Prodigio Pro to have a secure, locked-in fit due to its premium upper, and also praised the shoe's energetic ride, particularly…

$225 ★★★★★ 4.6

Salomon

Ultra Glide 4

$159.95 ★★★★★ 4.6

Skratch Labs

Sport Hydration Mix

Clean electrolyte drink mix with real fruit flavor. Low sugar.

$20 ★★★★★ 4.5

Salomon

ADV Skin 12

Industry-standard 12L race vest with front flask pockets and minimal bounce.

$180 ★★★★★ 4.8

Petzl

NAO RL

1500-lumen reactive lighting headlamp with 15-hour runtime. Automatic brightness adjustment.

$150 ★★★★★ 4.7

Garmin

Enduro 3

Ultra-endurance GPS watch with solar charging and 300+ hour battery in GPS mode.

$900 ★★★★★ 4.8

All gear guides →

Overview

The Trail du BW - 84km, organised by Blancs Gilets, takes place in Chaumont-Gistoux, Belgium. It is an 85km trail race with 1550m of elevation gain, equating to 18.2m of climb per km.

With a 12-hour time limit, this race has a cut-off tighter than 92% of 50-mile races, allowing for an average pace of 8.5 minutes per km. The field size of 64 finishers in its latest edition makes it bigger than 60% of 50-mile races.

The entry fee ranges from 35 to 45€. The event has been held 2 times, with the first race in 2023 and the latest in 2025. The next edition is scheduled for December 6, 2026.

Similar races

Other 50 mi trail ultras, closest in distance first.