Arc of Attrition course maps and aid stations

Entries opened on 13 July 2026, two days early for runners with a UTMB Index, and it's first come, first served, with no lottery and no waitlist. When this page was checked the 100K had sold out and the 100M, 50K and 20K were still open.

You don't need a UTMB Index to enter, but for the 100M the organizer recommends an index of at least 380 in the 50K, 100K or 100M category, since that's the pace the cutoffs are set at. You must be 20 or older for the 100M, 100K and 50K, and 17 for the 20K. Entries can't be transferred or deferred, and refunds come only through the cancellation insurance offered when you register. You can switch distance until 18 December 2026.

Perranporth Airfield is at Trevellas, near St Agnes. Perranporth itself is just off the A3075, which joins the A30. The event car park is at the airfield; you can't sleep in your car or a tent there, and you book your own accommodation. Cornwall Airport Newquay is 20 to 25 minutes away by car, and the nearest railway stations are Newquay, about 8 miles off, and Truro, which has trains from London Paddington.

The 100M, 100K and 50K start elsewhere, and coaches take runners there from the airfield, leaving 3 to 4 hours before the start. They're mandatory for the 100M and advised for the others. Nobody can drive or be dropped off at a start, and spectators aren't allowed at the 100M start in Coverack.

Only the 100M allows a crew: one person per runner, wearing the supporter wristband, at the aid stations in Porthleven, Land's End, Lelant and Portreath. The organizer strongly advises 100M runners to have one, with their own transport. The 100K, 50K and 20K allow no crew at all, though the organizer still wants you to have someone at the finish to drive you home.

There are no pacers. Running with anyone outside the zones 500 m either side of an aid station earns a penalty. Drop bags, in the 30 litre bag UTMB gives you at bib collection, go to Land's End for the 100M and Lelant for the 100K, with no poles inside.

January at Camborne, a little inland from the course's north coast stretch, averages a high of 9.2°C and a low of 4.9°C, with 120.6 mm of rain over about 17 wet days (Met Office, 1991 to 2020). The organizer warns of cold, heavy rain, fog, strong winds, hail and snow, and says your kit must keep you safe for 24 hours outdoors.

On the 2026 kit list, which the race site still links, the cold weather kit was part of the mandatory kit, and the organizer could drop items 24 hours before the start. The 100M and 100K need 1.5 litres of water, two headtorches of at least 300 lumens with spare batteries, a red tail light, a survival bag (not a foil blanket), a baseplate compass, waterproof trousers and two pairs of gloves. Your phone must stay on with the LiveTrail app running. Bring a bowl and cutlery if you want the hot food.