Date
Sat, 2 Oct 2027
Start
07:00
Venue
Chesham Guides Headquarters, Lowndes Park, Chesham, Buckinghamshire, HP5 1HX
Lye Green, Buckinghamshire
Countdown
October
A 100K trail ultra run as one anticlockwise loop through the Chilterns. With 1,800 m of climbing it's a gentle first hundred, and it's open to anyone 20 or over.
Key facts
0119-hour time limit for the full loop
02Fully marked course, but GPS navigation is required
03Minimum age 20, no qualifying races needed
Create a free training plan for the Chiltern Hills 100K
7-day free trial, no card required
The course
The route
Lye Green
Distance100km
Total climb1,800m
StartElevation
0 kmDrag map to rotate96.3 km
Weather
Early-October, Lye Green
17°CTypical high
9°CTypical low
3°CColdest in 20 years
42%Days with rain
Highs around 17°C and lows around 9°C, but it has dropped to 3°C. Rain on 42% of days.
NASA POWER data, 2006-2025, the week either side of race day
2026 results
Who finishes, and how
#RiderTimeAvg speed
01Vermeulen, Zara11:47:178.5 km/h
02Cristea, Simona12:52:217.8 km/h
03Harrsion, Hazel12:58:457.7 km/h
17
Women finishers
14:16:41
Median time
7.0 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
OrganiserRunaway Racing (Runaway Adventures Limited)
Websiterunawayracing.com
Instagram@runawayracing
Running since2025
Training
Training for the Chiltern Hills 100K
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 Hills 100K plan targets
Typical sessions
100 km with 1,800 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
Hill reps and vert to prepare the climbs and descents
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 Hills 100K plan.
7-day free trial, no card required.
More events in October in United Kingdom
Dartmoor Full Circle 100Expected Early October 2027 · Okehampton→Altra Kielder 10KExpected Early October 2027 · Kielder→JUST.GRAVEL GrizedaleExpected Early October 2027 · Grizedale Forest→Altra Kielder MarathonExpected Early October 2027 · Kielder→Beat Box HillExpected Early October 2027 · Box Hill Village→Drone Valley Trail Half MarathonExpected Early October 2027 · Unstone Green→
