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entries openArc of Attrition by UTMB
Arc 100M
Arc of Attrition by UTMB
Next edition: Friday, 22 January 2027 – Sunday, 24 January 2027Coverack to Perranporth, England
A winter 100-mile-plus journey along exposed Cornish coast path from Coverack to Perranporth, combining 5,507m of climbing, technical trail and long periods of darkness within 37 hours.
Official race site (opens in a new tab)
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Distance107.5 mi
Ascent5,507m
Climb / km31.8m
Cutoff37h
Cutoff pace12:50/km
Technicality8.9/10
EntryNot verified
FormatPoint-to-point
Next edition
22 January 2027 – 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
7.3/ 10
Very hard
High evidence confidence · 94% evidence coverage
This score is driven most by substantial race distance, high climbing demand, technical terrain. Difficulty V2's separate time-limit modifier adds 0.15 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 percent7 out of 10
Climbing, weighted 25 percent6.4 out of 10
Technicality, weighted 15 percent8.9 out of 10
Accumulated burden, weighted 17 percent5.9 out of 10
Exposure & support, weighted 13 percent7.1 out of 10
Course analysis
What shapes this race
Expect sections where foot placement and downhill confidence matter.
trailcoastaltechnical
Climbing density
31.8m 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 37h, the raw average required is 12:50 per kilometre (20:39 per mile), including every stop.
Raw pace12:50/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?
This is not designed as a first-ultra recommendation. Significant endurance, navigation or mountain-race experience is strongly advised.
1.3/10 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
Significant overnight running is likely for many entrants. Lighting, temperature management and sleep strategy can materially affect the outcome.
Personal race predictor
Will you make the cutoff?
Use a previous result to estimate a realistic range for Arc 100M, your potential buffer and the biggest change in demand.
Practical detail
Support & logistics
StartCoverack
FinishPerranporth
Support levelsemi-supported
LogisticsAccommodation nearby
LogisticsBag drop
LogisticsCrew access
UTMB100M
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 official 2027 race page verifies the date, 173km course, 5,507m ascent and 37-hour maximum. Price, field and exact aid-station count are intentionally left unknown.
- Successful source check
- 1 Sept 2026
- Catalogue record updated
- 1 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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