Spa, Belgium · Saturday, June 6, 2026

Fixed Distance 50K

The Longest Day 50km

Race completed

50 km Distance

1,680 m Climbing

5.0 Grit · Challenging

50.4838° N, 5.8667° E © OpenFreeMap © OpenMapTiles Data from OpenStreetMap

What the course asks

Climbing rate 34 m / km Rolling. Moderate undulations. Requires consistent effort across varying grades.

Time limit 13 hours 15:36 min/km average. Generous. Walkable throughout for most of the field. More forgiving than 80% of 50K races. Measured against 1034 races of the same distance. Cut-off calculator →

Field size ~343 Large. Rarely out of sight of another runner.

DUV results for the 2025 edition (52km) — 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 15 m of light

Regional 2001-2020 average for June — NASA POWER, grid elevation 266 m. Not a forecast.

Results history

Year	Race	Finishers	Men's winner	Women's winner
2025	52km	343	Christophe Grifgnee · 03:59:43	Carla Rivas Ferraro · 05:23:25
2024	50km	190	Germer Cardon · 04:16:21	Anika Bronkhorst · 05:36:13
2023	50km	157	Joachim van Hoye · 04:06:25	Inelore Smet · 05:30:45
2022	50km	73	Sylvain Lejeune · 04:02:43	Lore Smeets · 05:06:10
2021	50km	98	Guillaume Deneffe · 03:38:50	Itske Loomans · 05:36:54

The field grew 81% between 2024 (190) and 2025 (343). 50% of the 2025 field were women.

DUV results for the 2025 edition (52km) — 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

Gear for this race

Chosen for 50 km of trail with 1,680 m of ascent.

Trail Running Shoes 34 m of climb per kilometre — grip and rock protection before cushioning.
Race Nutrition 50 km of self-supported fuelling between aid stations.
Hydration Vests Pole attachment and chest-strap stability on steep ground.
Trekking Poles 1,680 m of ascent to walk up.
Headlamps A 13 h limit puts you out there after dark.

Salomon

Sense Ride 5

RunRepeat found the Salomon Sense Ride 5 to have immaculate lockdown and a smooth and stable ride, making it confident on moderate trails and steep downhills. I…

★★★★★ 4.5

Adidas

Terrex Speed Ultra

RunRepeat found the Adidas Terrex Speed Ultra to have a grippy outsole and great lockdown, while iRunFar noted that the shoe works on a variety of trail conditi…

★★★★★ 4.5

Skratch Labs

Sport Hydration Mix

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

$20 ★★★★★ 4.5

Nathan

VaporKrar 12L

12L race vest co-designed with ultra champion Rob Krar, with insulated bladder pocket.

$170 ★★★★★ 4.6

Black Diamond

Distance FLZ

Lightweight folding trekking poles with FlickLock Z adjustment. 340g per pole.

$170 ★★★★★ 4.7

Nitecore

UT32

Dual-beam trail running headlamp (1100 lumens) with spot and flood beams.

$100 ★★★★★ 4.5

All gear guides →

Overview

The Longest Day 50km in Spa, Belgium, presents a substantial challenge with 1680m of elevation gain over its 50km trail course, averaging 33.6m of climb per kilometer. This makes it a significantly hilly 50k.

With 343 finishers in its latest running, this race attracts a larger field than 96% of its 2646 peer 50km races. Runners have 13 hours to complete the course, translating to a cutoff pace of 15.6 minutes per kilometer. This time limit is more generous than 17% of 1003 comparable 50km events, offering considerable margin for the demanding terrain.

Similar races

Other 50K trail ultras, closest in distance first.