Trail ultramarathon · United Kingdom
22–24 January 2027 · Perranporth, Cornwall
Arc 20K: Sun, 24 January 2027
A winter UTMB World Series event on the South West Coast Path in Cornwall, run largely in darkness and Atlantic weather.
2027 dates confirmed
Event and distance dates were checked against the organizer schedule.
Date sourceEntry · Arc 20K · 2027 edition
First come, first served until places run out. Open on the organizer's page on 30 Sep 2026, which does not say how many places are left.
From the organizer's page, checked 30 Sep 2026. TrailSplits does not know whether you have a place; the organizer is the final word.
Arc of Attrition by UTMB is a trail ultramarathon scheduled for 22–24 January 2027 in Perranporth, Cornwall, United Kingdom. TrailSplits currently includes 4 mapped courses for this event, with course maps, elevation profiles, weather context, and pacing tools for the uploaded GPX data.
How to get a place: First come, first served with no pre-registration or lottery. For the January 2027 edition, sales opened on 13 July 2026 for UTMB Index holders (48 hours) and to everyone on 15 July 2026; no waiting list. Organizer's page, checked Wednesday 30 September 2026.
TrailSplits is a free, independent route & pacing companion — not the official race. Visit the official Arc of Attrition by UTMB site →
Finishing Arc 20K earns 1 Running Stone (20K category) toward the UTMB World Series Finals lottery. How Running Stones work.
Racing more than once next year? Add Arc 20K to a season and see whether your races work together.
Inspect the official course track on a topographic map, through its elevation profile, or in 3D.
› running direction two lines: out and back on the same path kilometres
Selected distance
Vert-focused blueprint with route-finder links into the Planner.
Other distances
Prepare and return
Keep this course, its training plan, calendar and future course updates together in your private My Races page. Saving does not publish your workouts, pace or progress.
Race route lab
Open the official course in Planner, then choose a nearby start point to build a shorter loop that matches the course demand. This course averages about 33.7 m climb per km.
Sun, 24 January 2027
Send to your watch
Get the official course as a clean GPX or a Garmin TCX course, with step-by-step instructions to load it onto a Garmin, COROS, Suunto, Wahoo, or Komoot — free, no account needed.
Compare your training
See how faithfully your rehearsal route matches the real race. The official course for Arc 20K loads as Route A — upload your training route to compare distance, elevation gain, estimated time, and how much of the course you actually cover.
Course analysis
See the Arc 20K course broken into its major climbs and descents in order — length, gain, average grade, and steepness — so you know where the crux is and how to pace and fuel it.
Race-week reminders
A free browser notification in the final week — the course crux, the weather window, and loading the GPX onto your watch. No app, no email, no account.
Arc of Attrition by UTMB 2027 races run 22–24 January 2027 in Perranporth, Cornwall; the Arc 20K is on Sun, 24 January 2027. Check the official race site for registration deadlines and final details.
4 distances (22.1–173 km). The longest course is 173 km with about 5,507 m of vertical gain — a demanding mountain course.
Yes. TrailSplits gives you the course map, an interactive elevation profile, a 3D flyover and a downloadable GPX for every mapped distance — free and with no sign-up.
Each distance has a free, course-specific 16-week training plan built around its distance, vertical gain and cut-offs, plus a pace and cut-off calculator.
No. TrailSplits is a free, independent route and pacing companion. For registration and official rules, visit https://arcofattrition.utmb.world/.
Load the GPX directly into TrailSplits for surface analysis and terrain intel.