Bouillon, Belgium · Saturday, June 6, 2026

Fixed Distance 100K

Trail Godefroy Bouillon

Race completed
100 km Distance
3,100 m Climbing
9.7 Grit · Elite / extreme
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49.7932° N, 5.0670° E © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Climbing rate 31 m / km Rolling. Moderate undulations. Requires consistent effort across varying grades.
Time limit 20 hours 12:00 min/km average. Generous. Walkable throughout for most of the field. More forgiving than 72% of 100K races. Measured against 214 races of the same distance. Cut-off calculator →
Field size ~108 Mid-sized. Company early, well spread out by halfway.

DUV results for the 2025 edition (100km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

Typical conditions, June

Daytime high 21°C
Night low 11°C
Rainfall Mostly dry
Daylight 16 h 09 m of light

Regional 2001-2020 average for June — NASA POWER, grid elevation 295 m. Not a forecast.

Results history

Year Race Finishers Men's winner Women's winner
2025 100km 108 Clement Amice · 11:07:39 Laura Raceliene · 13:52:25
2024 104km 117 Dylan Dame · 09:51:10 Danielle Froidmont · 15:01:20

The field shrank 8% between 2024 (117) and 2025 (108). 11% of the 2025 field were women.

DUV results for the 2025 edition (100km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.

The Aid Station

Course-specific beta from the community

⛰️ terrain

This is a rolling course. Expect fast, runnable sections where rhythm is key.

By UltraHub Expert
👟 gear

With trail terrain, choose a shoe with moderate cushioning for optimal performance.

By UltraHub Expert
🥤 nutrition

For 100km+ efforts, prioritize real food at aid stations to prevent palate fatigue.

By UltraHub Expert

Gear for this race

Chosen for 100 km of trail with 3,100 m of ascent.

  • Trail Running Shoes 31 m of climb per kilometre — grip and rock protection before cushioning.
  • Race Nutrition Past 100 km the palate quits before the legs do — carry more than one flavour.
  • Hydration Vests Pole attachment and chest-strap stability on steep ground.
  • Trekking Poles 3,100 m of ascent to walk up.
  • Headlamps A 20 h limit puts you out there after dark.

Adidas

Terrex Agravic Speed Ultra

RunRepeat found the Adidas Terrex Agravic Speed Ultra to be perfect for midfoot and forefoot strikers, while iRunFar noted that the shoe feels incredibly effici…

★★★★★ 4.5

Asics

Trabuco Max 3

★★★★★ 4.6

Maurten

Gel 100

Hydrogel technology for 25g carbs per gel with minimal GI distress.

$3.5 ★★★★★ 4.7

Salomon

ADV Skin 12

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

$180 ★★★★★ 4.8

LEKI

Ultratrail FX.One

Ultra-light carbon folding poles (135g each) designed for mountain ultra racing.

$200 ★★★★★ 4.6

Petzl

NAO RL

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

$150 ★★★★★ 4.7
All gear guides →

Overview

Trail Godefroy Bouillon is a 100k trail race in Bouillon, Belgium, organised by trailrun.be. With 31 meters of climb per kilometer, this race is more demanding than most 100k events, requiring sustained effort over its 3100 meters of total elevation gain.

Runners have 20 hours to complete the course, a cutoff that is tighter than 22% of comparable 100k races. This translates to a 12 minutes per kilometer average pace, leaving little room for extended breaks or slower sections on the challenging terrain. The entry fee ranges from 47 to 65 €.

With 108 finishers in its latest edition, this race draws a larger field than 76% of its 311 100k peers. The 2026 edition on June 6 marks the third running of an event that began in 2024.

Similar races

Other 100K trail ultras, closest in distance first.