Cadair X
Tywyn, United Kingdom • 25 Apr 2026
Event overview
Cadair X is a mountain half marathon scheduled for 25 April 2026 with a course distance of 13.1 miles and a total height gain of 1165 m. The route is classed as mountain terrain: about 65% trail, 25% mountain path, and 10% tarmac. The route reaches the summit of Cadair Idris at 893 m. There is a summit cut-off set at 90 minutes after the race start. The event is listed as an UTMB Index Race and uses marked arrows on the route.
Route and logistics
The route passes through Dol Idris woodland, a wooded gorge, glacial lakes including Llyn Cau, ascent to Mynydd Moel, and the summit of Cadair Idris. The descent follows the Pony Path, then heads toward Tyn Y Fach and Mary Jones' Chapel, continues along the Mary Jones walk and woodland tracks, and returns near the north side of the lake Tal Y Llyn to Cadair Tearoom. Checkpoints are located at approximately 4.1 km (summit altitude), 7 km (600 m) with water, 12.5 km (25 m) with water, electrolyte and food, and 16 km (95 m) with water, electrolyte and food. Race HQ is at Dol Idris; parking and toilets are available at Dol Idris Car Park, and all-day parking and camping at Dol Einion Campsite. Competitors are advised to carry hill running kit such as a windproof jacket, whistle, a fully charged mobile phone, and suitable running shoes for mountain terrain. In severe mountain weather a Plan B route may be used. Visit the organization's website for the most recent information.