The Arc of Attrition traces 100 miles of Cornwall's South West Coast Path in the depths of January, from Coverack to Porthtowan. Battered by Atlantic storms, shrouded in darkness for most of the race, and defined by a relentless succession of steep coastal climbs, it is widely regarded as the UK's toughest winter ultra.
Born in Cornwall's wild far west, the Arc of Attrition follows the South West Coast Path from the fishing village of Coverack on the Lizard Peninsula to Porthtowan on the north coast. The course passes Britain's most southerly point, traces Mount's Bay, rounds the iconic Land's End peninsula, and pushes through some of the most remote and exposed coastline in England. With over 5,000 metres of cumulative elevation gain across a relentless series of short, steep climbs in and out of rocky coves, the terrain never lets up.
Held in late January, the race unfolds largely in darkness, with only nine hours of daylight and conditions that range from driving rain and Atlantic gales to freezing mist. The notorious stretch from Land's End to Pendeen, hit in the dead of night, is where the race earns its name: a grinding, boggy crucible of slippery rock, mud, and coastal scrub that breaks more than half the field. Landmarks along the way include the dramatic Minack Theatre, the haunting tin mine ruins of Botallack, and the sweeping headlands of Zennor.
Founded in 2015 by the MudCrew and now part of the UTMB World Series, the Arc of Attrition has grown from a small gathering of 50 local runners into one of Europe's most respected winter ultras. Finishing is marked by a coveted buckle, and the sight of St Ives harbour at dawn, after hours of dark coastal struggle, remains one of the most emotional moments in British ultra running.
Porthtowan, ENG ·
22 Jan - Jan 25, 2026