Llanberis, Wales, United Kingdom
The Marathon Eryri draws approximately 2,500 finishers each October on a mountain road in Llanberis, United Kingdom. It is one of the UK's iconic tough road marathons and rewards strength more than pace ambition. The course passes mountain lakes, steep Welsh road sections, and dramatic Snowdonia views almost throughout. Expect significant climbs on this hilly course.
Marathon Eryri is a certified 42.195 km (26.2 mile) marathon — the standard World Athletics marathon distance.
The next Marathon Eryri is scheduled for Sunday, 4 October 2026 with a 9:00 am start. The certified course covers 42.195 km (26.2 miles) with 250 m of climbing on a hilly with notable climbs layout.
Starts and finishes in Llanberis at the foot of Yr Wyddfa. The course passes mountain lakes, steep Welsh road sections, and dramatic Snowdonia views almost throughout. Hilly with notable climbs. Moderate terrain throughout.
The Marathon Eryri course is hilly with notable climbs over 42.195 km (26.2 miles). Runners cover 250 metres of climbing and 200 metres of descent, with a net climb of 50 metres from start to finish.
The Marathon Eryri uses open online registration at marathoneryri.com with no ballot or qualifying time for the general field. Sign-up for the October race typically opens the previous year and places are allocated first-come, first-served. Charity bibs are available through partner organisations when general entry closes.
Last updated 18 July 2026. Edition dates and course details are reviewed regularly.
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