Loading Race For You
Loading page content.
entries openAction Challenge Ltd
Chiltern 50 Ultra Challenge
Ultra Challenge
Next edition: Saturday, 25 September 2027Henley Showground, England
A 50 km loop from Henley Showground through the Chiltern countryside, nature reserves and historic trails.
Official race site (opens in a new tab)
Optional device-only history; never synced to your account. Shared-device users can leave it off.
Distance31.1 mi
Ascent920m
Climb / km18.4m
CutoffUnknown
Cutoff paceUnknown
TechnicalityUnknown
Entry£139
FormatLooped
Next edition
25 September 2027
This is the most relevant confirmed edition currently held for the permanent race family. Edition-specific facts should still be checked against the final organiser instructions.
Edition archive
Expand an edition to inspect its year-specific facts. Other years never replace the primary edition facts.
Past editions
2026Past edition
These facts belong to the 2026 edition only. Missing values have not been copied from another year.
- Distance
- 50 km
- Ascent
- 920m
- Cutoff
- Not verified
- Entry
- Not verified
- Format
- continuous · single stage · looped
- Stage layout
- Not applicable
Successful source check: 4 Sept 2026Source confidence: mediumThe cited 2026 edition sources were reviewed on 4 September 2026 and support the recorded date, distance, ascent, format and lifecycle. Unresolved facts remain marked unknown rather than being inferred.
Check Chiltern 50 Ultra Challenge 2026 source (opens in a new tab)
Race For You difficulty
3.5/ 10
Moderate
Limited input evidence · 45% evidence coverage
The main recorded demands are balanced overall demands. Course difficulty and cutoff pressure describe different challenges: more approachable terrain can still require a demanding pace to beat the deadline. Neither score assesses your personal fitness, safety or readiness.
Scoring details and version
Difficulty V2's separate time-limit modifier adds 0.00 points here and is capped at 0.70; a broad limit cannot erase extreme intrinsic demand. This is independent of the public Cutoff Pressure V2 band. Evidence coverage describes the recorded inputs, not prediction accuracy or your likelihood of finishing.
Weather, conditions and individual preparation can change the real difficulty significantly.
How the score works Distance, weighted 30 percent3 out of 10
Climbing, weighted 25 percent2.9 out of 10
Technicality, weighted 15 percent5.5 out of 10
Accumulated burden, weighted 17 percent1.9 out of 10
Exposure & support, weighted 13 percent5.5 out of 10
Course analysis
What shapes this race
Expect forest trail that may change character in wet conditions.
trailforestmixed
Climbing density
18.4m per km
A more useful comparison than total ascent alone: it shows how consistently the course asks you to climb.
Cutoff analysis
Unknown
The official overall cutoff has not yet been verified. Race For You will not estimate one.
Who this suits
First ultra?
There is not enough verified information to assess first-ultra suitability yet.
Exposure & kit
unknown kit
Night-running exposure has not been verified for this edition. Check the organiser’s latest schedule, route information and final kit rules.
Personal race predictor
Will you make the cutoff?
Use a previous result to estimate a realistic range for Chiltern 50 Ultra Challenge, your potential buffer and the biggest change in demand.
Practical detail
Support & logistics
StartHenley Showground
FinishHenley Showground
Support levelunknown
Logistics are only shown where currently recorded. Confirm parking, transport, crew access and final aid-station plans with the organiser.
Latest verification
Trust the source, see the gaps.
Data PartialField-scoped source check 2026-09-28. 2027 event and 2027 sign-up page independently confirm 25 September and registration open. 50 km Henley Showground loop, 920 m ascent. Self-funded price £139 plus compulsory 4% platform booking fee (£5.56); charity-funded alternatives require fundraising. Ultra March targets are not overall cutoffs. Unspecified fields remain unconfirmed for this edition; prior edition details have not been copied. Only explicitly sourced new-edition facts are populated. Prior-edition route, price, entry status and participation details have not been inherited.
- Successful source check
- 28 Sept 2026
- Catalogue record updated
- 28 Sept 2026
- Official source
- Available
Still unverified: cutoff.
Event details can change after a successful source check. Confirm the final route, kit, cutoff, price and entry terms directly with the organiser before entering or travelling.
Found something wrong?
Help keep this race accurate.
Wrong cutoff? Date changed? New course? Tell us what moved and include the official source if you have it.
Report an updateKeep exploring
Browse the race catalogue
Use explicit distance, place, date, terrain and format filters to compare current races.