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

A community-focused 10 km event in Abersoch on 8 March 2026 that welcomes running, jogging and walking with no cut-off times. Cancer information packs and on-site support are provided; entry fee is £20.

Nant Yr Arian Silver Trail in the Cambrian Mountains offers Half Marathon and 10 km trail races plus junior races for several age groups. Routes are waymarked with feed stations and marshals and the event supports local charities.

Trail event in the Black Mountains offering marked 11, 20 and 40 mile routes with GPX files, stocked checkpoints, mandatory kit checks and canicross-friendly provisions.

Take on the Ras yr Aran fell race in North Wales on Saturday 21 March 2026 from Llanuwchllyn near Bala. The senior course is 16.1 km with about 945 m of ascent for a scenic but demanding mountain challenge and a junior race is offered.