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fullArc of Attrition by UTMB
Arc 100K
Arc of Attrition by UTMB
Next edition: Saturday, 23 January 2027 – Sunday, 24 January 2027Land's End, England
A technical winter ultra from Land's End to Perranporth on the South West Coast Path, compressing rugged cliffs, 2,708m of ascent and long self-sufficient stretches into a 16-hour race window.
Race area · approximate race area. Approximate race area. Check the organiser’s website for the exact start and race-day directions.
Location evidence
Existing saved event-to-place evidence reused; geography query derived from "Land's End". GeoNames exact settlement/suburb name match for "Land's End", country England, administrative area Cornwall, region South West; population 0 (zero means unspecified). Representative event-area point, not a venue address, exact start or radius guarantee. Directional catalogue locations use the first disclosed event locality only as EVENT_AREA; other route endpoints are not substituted. Geographic lookup does not reverify dates or non-location facts. GeoNames (https://www.geonames.org/), CC BY 4.0; transformed to event-area coordinates with separate event-source evidence.
Location checked 2026-09-14.
Official race site (opens in a new tab)
Optional device-only history; never synced to your account. Shared-device users can leave it off.
Distance51.4 mi
Ascent2,708m
Climb / km32.7m
Cutoff16h
Cutoff pace11:37/km
Technicality8.1/10
EntryNot verified
FormatPoint-to-point
Next edition
23 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
5.3/ 10
Hard
High input evidence · 94% evidence coverage
The main recorded demands are technical terrain, exposure and self-sufficiency. 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 0.35 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. 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 percent4.1 out of 10
Climbing, weighted 25 percent5.1 out of 10
Technicality, weighted 15 percent8.1 out of 10
Accumulated burden, weighted 17 percent2.5 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
32.7m 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 16h, the raw average required is 11:37 per kilometre (18:41 per mile), including every stop.
Raw pace11:37/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.
2.9/10 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 100K, your potential buffer and the biggest change in demand.
Practical detail
Support & logistics
StartLand's End
FinishPerranporth
Support levelsemi-supported
LogisticsAccommodation nearby
LogisticsBag drop
UTMB100K
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 2027 date, 82.7km distance, 2,708m ascent and 16-hour maximum time are verified on the official race page. Price, field size and exact aid-station count remain unknown. Field-scoped check 2026-09-28: Current official edition page explicitly displays Race full; date, 82.7 km, 2708 m and 16-hour limit reconfirmed. No waitlist availability was established. Published start is 23 January 2027 10:00 and maximum race time is 16 hours, ending 24 January at 02:00 Europe/London. End date is calculated from that explicit schedule, not an annual rollover. Only these facts were reviewed; other details retain their previous source dates.
- Successful source check
- 1 Sept 2026
- Catalogue record updated
- 28 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.
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