Trail

Cadair X Half Marathon

📅 October 16, 2027 (estimated date)📍 Tremadog · United Kingdom

⚠️ 2027 edition: provisional information

The date is estimated from the 2026 edition (October 17, 2026), on the same day of the week. Courses, start times, fees and description are carried over from the previous edition: check them on the official website. This page will be updated as soon as the organizer publishes them.

Available distances

13.1 mi

About

The Cadair X Half Marathon is a 21 km mountain half marathon in Tremadog, Wales, starting at 10:30 on 17 October 2026 in some of the country's most iconic scenery. It packs in 1,165 m of elevation gain over a mix of trails, mountain paths and tarmac roads.

The course climbs through ancient woodland, skirts glacial lakes and follows historic mountain paths before the ascent of the majestic Cadair Idris. The terrain breaks down as 65% trail, 25% rough mountain path and 10% road, combining natural beauty with serious climbing. Runners must reach the summit within 90 minutes of the start to continue, which calls for excellent fitness and good mountain preparation.

D-359

Prepare for Cadair X Half Marathon with RunRun

An AI-generated training plan, adjusted every week based on your real sessions. Built around your goal, current level and race date.

Personalized plan based on your VO2max, history and weekly availability
Strava and Garmin sync: your sessions are analyzed and the plan adapts
Target paces, long runs, key sessions: everything is calculated for race day

Create my free plan No credit card. Sign up in 30 seconds.

Races nearby

Other upcoming races around Tremadog.