Coverack, United Kingdom · Trail
Official site ↗Arc of Attrition by UTMB
Britain's winter 100-miler, run each January along Cornwall's South West Coast Path: 173 km and 5,507 m of climbing from Coverack to Perranporth, most of it in the dark.
Friday, January 22, 2027 at 1:00 PM UTC
New courses for 2027. The event moved its base to Perranporth Airfield, the 100-miler lengthened from 161 km to 173 km, the 100K start moved from Porthcurno to Land's End, and a new 50K replaced the 25K, running south from Harlyn Bay.
Registration is open.
Distances
Arc 100M
- Distance
- 173 km (107 mi)
- Vert gain
- 5,507 m (18,100 ft)
- Start
- 1:00 PM UTC
- Cutoff
- 37 hr
Starts at Coverack on the Lizard peninsula and finishes at Perranporth Airfield, closing at 2:30 a.m. on the Sunday.
Arc 100K
- Distance
- 82.7 km (51 mi)
- Vert gain
- 2,708 m (8,900 ft)
- Start
- 10:00 AM UTC
- Cutoff
- 16 hr
Starts at Land's End and finishes at Perranporth Airfield, closing at 2:30 a.m. on the Sunday.
| Distance | Vert gain | Start | Cutoff | Notes |
|---|---|---|---|---|
| 173 km (107 mi) | 5,507 m (18,100 ft) | 1:00 PM UTC | 37 hr | Starts at Coverack on the Lizard peninsula and finishes at Perranporth Airfield, closing at 2:30 a.m. on the Sunday. |
| 82.7 km (51 mi) | 2,708 m (8,900 ft) | 10:00 AM UTC | 16 hr | Starts at Land's End and finishes at Perranporth Airfield, closing at 2:30 a.m. on the Sunday. |
About
The Arc of Attrition runs every January along the South West Coast Path in Cornwall, and it is named for what it does to a field. The 100-miler starts at Coverack on the Lizard peninsula on Friday afternoon and finishes at Perranporth on the north coast, which means two winter nights on cliff path for most of the field. In 2026, 630 runners started it and 261 finished.
It is a UTMB World Series event, so a finish earns Running Stones toward the Chamonix lottery, and the weekend also holds a 100K, a 50K and a 20K, all finishing at Perranporth Airfield. The course moved for 2027: the miler lengthened from 161 km to 173 km, the 100K start moved to Land's End, and a new 50K runs south from Harlyn Bay.
Course
Point to point along the South West Coast Path, finishing at Perranporth Airfield. The Arc 100M covers 173 km with 5,507 m of climbing from Coverack, on a 37-hour limit; the Arc 100K covers 82.7 km with 2,708 m from Land's End, on 16 hours. Both start in daylight and spend most of their distance in winter darkness, and the races start in waves, so the closing times run half an hour past the stated limit.
How to register
Entry is first come, first served, with a 48-hour priority window for runners holding a valid UTMB Index before general entries open in July. The organiser states plainly that there is no pre-registration, no lottery and no waiting list. There is no qualifying result to submit: the only hard requirement is age, 20 or over for the three longer races, and a UTMB Index of 380 or more is a recommendation rather than a gate.