Date
Sat, 25 Sept 2027
Venue
Henley Showground, Henley-on-Thames
Henley-on-Thames, Oxfordshire
Countdown
September
The middle option: a 25 km loop from Henley basecamp with 500 m of climbing. Long enough to feel like a proper day out, gentle enough that you can enjoy it.
Key facts
01Minimum age 14; under 18s must be accompanied by an adult participant
Create a free training plan for the Chiltern 50 Ultra Challenge 25 km
7-day free trial, no card required
The course
The route
Henley-on-Thames
Distance25km
Total climb500m
StartElevation
0 kmDrag map to rotate25.7 km
Weather
Late-September, Henley-on-Thames
19°CTypical high
9°CTypical low
4°CColdest in 20 years
38%Days with rain
Highs around 19°C and lows around 9°C, but it has dropped to 4°C. Rain on 38% of days.
NASA POWER data, 2006-2025, the week either side of race day
2026 results
Who finishes, and how
#RiderTimeAvg speed
01Gemma PROBERT02:36:139.6 km/h
02Hannah ISHIHARA02:36:249.6 km/h
03Kate WHITE02:37:209.5 km/h
239
Women finishers
5:51:30
Median time
4.3 km/h
Median speed
Women · 2026 results, as published by the organiser.
How fast could you finish?
Get a prediction based on your recent training
Organiser
OrganiserUltra Challenge Ltd (Ultra Challenge; also associated with Action Challenge)
Websiteultrachallenge.com
Instagram@ultrachallenges
Running since2014
Training
Training for the Chiltern 50 Ultra Challenge 25 km
We don't do generic plans. We combine deep knowledge of this race's demands with your recent training, then build a plan with you that progresses as you do.
Beina integrates directly with your existing tools to understand your current fitness, and synchronise your planned sessions.
Intervals.icuWhat a Chiltern 50 Ultra Challenge 25 km plan targets
Typical sessions
25 km with 500 m of climbing
Time on feet and fatigue resistance
Fuelling and pacing for the whole event
What your weeks look like
Typical sessions
Long runs that build time on your feet
Tempo and threshold sessions to hold race pace
Back-to-back weekend runs for fatigue resistance
Not a generic schedule
Typical sessions
Built from your current fitness and the time you actually have
Adapts every week as Beina learns how you respond
Syncs your sessions straight to Garmin and Wahoo
One clear next session, never a wall of spreadsheet
Entries open now
Get your Chiltern 50 Ultra Challenge 25 km plan.
7-day free trial, no card required.
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