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entries openArc of Attrition by UTMB
Arc 50K
Arc of Attrition by UTMB
Next edition: Sunday, 24 January 2027Harlyn Bay to Perranporth, England
A winter point-to-point 50K on Cornwall's Atlantic coast, using exposed clifftop trail from Harlyn Bay to Perranporth with 1,458m of ascent and a nine-hour limit.
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Distance30.7 mi
Ascent1,458m
Climb / km29.5m
Cutoff9h
Cutoff pace10:56/km
Technicality6.8/10
EntryNot verified
FormatPoint-to-point
Next edition
24 January 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
This is the only edition currently stored for this race family. Earlier verified editions can be added without changing the permanent race URL.
Check the official race source (opens in a new tab)Race For You difficulty
4.3/ 10
Moderate
High evidence confidence · 94% evidence coverage
This score is driven most by technical terrain, exposure and self-sufficiency. 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 percent3.9 out of 10
Technicality, weighted 15 percent6.8 out of 10
Accumulated burden, weighted 17 percent1.6 out of 10
Exposure & support, weighted 13 percent6.3 out of 10
Course analysis
What shapes this race
Expect sections where foot placement and downhill confidence matter.
trailcoastaltechnical
Climbing density
29.5m per km
A more useful comparison than total ascent alone: it shows how consistently the course asks you to climb.
Cutoff analysis
Very high pressure
To finish inside 9h, the raw average required is 10:56 per kilometre (17:35 per mile), including every stop.
Raw pace10:56/km
PressureVery high 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?
A realistic target for a prepared runner with some trail or ultra experience, but not the softest possible introduction to the distance.
5.8/10 suitability
Navigation
partially marked
Do not assume closed-road-race levels of signage. Know the organiser’s navigation requirements and keep the official route available.
Exposure & kit
extensive kit
Some entrants may run into darkness depending on pace and start time. Prepare lighting even if your best-case plan finishes earlier.
Personal race predictor
Will you make the cutoff?
Use a previous result to estimate a realistic range for Arc 50K, your potential buffer and the biggest change in demand.
Practical detail
Support & logistics
Aid stations3 listed
StartHarlyn Bay
FinishPerranporth
Support levelsemi-supported
LogisticsAccommodation nearby
LogisticsBag drop
UTMB50K
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 PartialThe current official page verifies the 2027 date, 49.4km distance, 1,458m ascent, nine-hour cutoff and three aid stations. Price and Running Stones are left unverified.
- Successful source check
- 2 Sept 2026
- Catalogue record updated
- 2 Sept 2026
- Official source
- Available
Still unverified: entry price.
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.
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