Cadair X

Tywyn, United Kingdom • 10 May 2025

Cadair X is a challenging half marathon event organized by WESWIMRUN, set against the stunning backdrop of Cadair Idris in Wales. The route spans 13.1 miles, featuring a significant elevation gain of 1165 meters, and comprises 65% trail, 25% mountain path, and 10% tarmac. Participants will navigate through ancient woodlands, glacial lakes, and historic trails, culminating at the summit of Cadair Idris. The race emphasizes sustainability, with no disposable cups used. It is recognized as an UTMB Index Race, attracting runners seeking both adventure and competition in a breathtaking natural setting. Visit the organization's website for the most recent information.

Race information

UTMB 20K
13 mi
13.1 Miles
Visit the organization's website for the most recent information.
Trail runs nearby

Reservoir Roundabout on 10 January 2026 at Elan Valley Visitor Centre offers scenic but challenging upland walks and runs with 20 mile and 12 mile route options. Routes are partly waymarked so map reading and proper kit are required; this n..

Take on the Ras Tarrenhendre Fell Race in Abergynolwyn, Wales on 31 January 2026, a rugged 6 mile course climbing to Tarrenhendre summit with 2000 ft of ascent. Enjoy tough trails, dramatic views and homemade soup back at HQ.

Nant Yr Arian Silver Trail Races on 14 March 2026 in the Cambrian Mountains with half marathon, 10 km and junior races. Organised by Aberystwyth Athletic Club as a not for profit race supporting charities, routes are waymarked with GPX.

Take on the Beast of the Blacks in the dramatic Black Mountains of Wales on 14 March 2026, choosing 11, 20 or 40 mile trail routes through rugged, scenic terrain. Well supported with checkpoints, vegan refuel, camping and canicross welcome..