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entries openCenturion Running
Hundred Hills 50K
Centurion Running
Next edition: Saturday, 20 March 2027Stonor Park, England
Two distinct trail loops from Stonor Park through the Chiltern countryside, with a nine-hour limit, full course marking and five aid stations making the format unusually legible for a first ultra.
Official race site (opens in a new tab)
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Distance31.1 mi
Ascent1,200m
Climb / km24m
Cutoff9h
Cutoff pace10:48/km
Technicality3.8/10
Entry£80
FormatLooped
Next edition
20 March 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
2026Completed
These facts belong to the 2026 edition only. Missing values have not been copied from another year.
- Distance
- 50 km
- Ascent
- 1,200m
- Cutoff
- 9h
- Entry
- £78
- Format
- continuous · single stage · looped
- Stage layout
- Not applicable
Successful source check: 1 Sept 2026Source confidence: highThe official 2026 page verifies the date, 50K distance, 1,200m ascent, nine-hour cutoff, £78 fee, 450-runner field, five aid stations and fully marked course.
Check Hundred Hills 50K 2026 source (opens in a new tab)
Race For You difficulty
3.2/ 10
Beginner-friendly
High evidence confidence · 94% evidence coverage
This score is driven most by balanced overall demands. Difficulty V2's separate time-limit modifier adds 0.35 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.
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 percent3.4 out of 10
Technicality, weighted 15 percent3.8 out of 10
Accumulated burden, weighted 17 percent1 out of 10
Exposure & support, weighted 13 percent3.1 out of 10
Course analysis
What shapes this race
Expect forest trail that may change character in wet conditions.
trailforestmixed
Climbing density
24m per km
A more useful comparison than total ascent alone: it shows how consistently the course asks you to climb.
Cutoff analysis
High pressure
To finish inside 9h, the raw average required is 10:48 per kilometre (17:22 per mile), including every stop.
Raw pace10:48/km
PressureHigh pressure
Cutoff pressure compares the published time limit with distance, ascent and verified course demands. Lower pressure does not mean the race is easy. Raw pace includes checkpoints, food stops, navigation errors and any sleep; it is not a pacing plan.
Who this suits
First ultra?
One of the more approachable options in its distance bracket, provided you prepare for the full distance and practise the required kit and pacing.
8.4/10 suitability
Navigation
fully marked
The route is described as marked, but runners should still read the final race instructions.
Exposure & kit
moderate kit
Night running is not expected for most entrants based on the current format, but final kit rules still take priority.
Personal race predictor
Will you make the cutoff?
Use a previous result to estimate a realistic range for Hundred Hills 50K, your potential buffer and the biggest change in demand.
Practical detail
Support & logistics
Aid stations5 listed
StartStonor Park
FinishStonor Park
Support levelfully supported
LogisticsParking noted
LogisticsAccommodation nearby
LogisticsBag drop
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 HighThe official 2027 page verifies the 20 March date, 50K distance, 1,200m ascent, nine-hour cutoff, £80 affiliated fee, 600-runner field, five aid stations and marked two-loop course.
- Successful source check
- 1 Sept 2026
- Catalogue record updated
- 1 Sept 2026
- Official source
- Available
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?
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