Arc of Attrition by UTMB Arc 100M
Arc 100M is a winter coastal ultra in Cornwall, running from Coverack toward Perranporth over exposed South West Coast Path terrain in January conditions.
Every link above goes to the race, its timing provider, or an official registration partner. Last checked July 29, 2026.
Quick facts
- Winter 100-mile coastal ultra on Cornwall's South West Coast Path
- Starts at Coverack and finishes toward Perranporth
- Known for wind, mud, darkness, and exposed cliff-top running
- 2027 edition has an officially announced January race date
2027 Arc of Attrition by UTMB Arc 100M registration
Registration for the 2027 Arc of Attrition by UTMB Arc 100M runs through the official registration page at arcofattrition.utmb.world.
About the Arc of Attrition by UTMB Arc 100M
Arc of Attrition by UTMB is a winter trail weekend on Cornwall's South West Coast Path. Arc 100M is the longest race, sending runners point-to-point along exposed coastal terrain.
Course
The 100-mile route starts in Coverack and follows the South West Coast Path toward Perranporth. Expect relentless coastal climbing, cliff-top exposure, mud, darkness, and technical footing.
Race-day weather
January on the Cornish coast can mean wind, rain, cold nights, and saturated trail. Even moderate temperatures can feel harsh when runners are exposed to sea weather for many hours.
Past Arc of Attrition by UTMB Arc 100M dates and results
| Year | Date | Status | Results |
|---|---|---|---|
| 2027 | Friday, January 22, 2027 | Upcoming | — |
Arc of Attrition by UTMB Arc 100M FAQ
When is the Arc of Attrition by UTMB Arc 100M?
The 2027 Arc of Attrition by UTMB Arc 100M is on Friday, January 22, 2027.
How do I register for the Arc of Attrition by UTMB Arc 100M?
Register for the Arc of Attrition by UTMB Arc 100M through the official registration link: marathonscout.com/go/arc-of-attrition-100m/register. It opens the race registration page at arcofattrition.utmb.world.
Race organizer or timing partner?Send an official race update
Send us confirmed dates, registration links, results, live tracking, or course changes. Include the source link so runners can reach the right information.