Ultra Running Hub Leende, Netherlands · Sunday, April 19, 2026
Fixed Distance 50K
Leenderbos Ultra Trail
Race completed
50 km Distance
135 m Climbing
2.7 Grit · Entry level
What the course asks
Climbing rate 3 m / km
Fast & Flat. This course is relatively flat and fast. Ideal for PB attempts.
Time limit 8 hours
9:36 min/km average. Comfortable. Room to walk the climbs and stop at aid. Tighter than 89% of 50K races. Measured against 1007 races of the same distance. Cut-off calculator →
Field size ~165 Mid-sized. Company early, well spread out by halfway.
DUV results for the 2025 edition (50km) — finishers only. Starters are not published, so the field was at least this big and no finish rate can be given.
Typical conditions, April
Daytime high 15°C
Night low 5°C
Rainfall Mostly dry
Daylight 14 h 03 m of light
Regional 2001-2020 average for April — NASA POWER, grid elevation 21 m. Not a forecast.
The Aid Station
Course-specific beta from the community
This is a fast & flat course. Expect fast, runnable sections where rhythm is key.
With trail terrain, choose a shoe with moderate cushioning for optimal performance.
Gear for this race
Chosen for 50 km of trail with 135 m of ascent.
- Trail Running Shoes50 km of trail — cushioning that is still there in the last quarter.
- Race Nutrition50 km of self-supported fuelling between aid stations.
- Hydration VestsFlask capacity for 50 km, without the bounce.
- GPS WatchesBattery life first — a 50 km day outlasts most full-GPS modes.
Course Notes
A 50k Ultra Trail through the beautiful Groote Heide with start and finish in Leende, The Netherlands.
Similar races
Other 50K trail ultras, closest in distance first.