Ultra Running Hub Berkhamsted, United Kingdom · Saturday, October 31, 2026
Fixed Distance 50K
Chiltern Ridge Winter 50k
Race completed
50 km Distance
800 m Climbing
3.7 Grit · Challenging
What the course asks
Climbing rate 16 m / km
Rolling. Moderate undulations. Requires consistent effort across varying grades.
Time limit 9 hours
10:48 min/km average. Generous. Walkable throughout for most of the field. Tighter than 70% of 50K races. Measured against 1087 races of the same distance. Cut-off calculator →
Field size ~297 Large. Rarely out of sight of another runner.
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, October
Daytime high 15°C
Night low 7°C
Rainfall Mostly dry
Daylight 9 h 46 m of light
Regional 2001-2025 average for October — NASA POWER, grid elevation 89 m. Not a forecast.
The Aid Station
Course-specific beta from the community
This is a rolling 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 800 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.
Similar races
Other 50K trail ultras, closest in distance first.