Eryri 100K

Eryri 100K

The organiser’s race page gives 108 km and 5,800 m, through some of the most prominent peaks and climbs of northern Eryri National Park. The terrain includes technical scree, rocky paths and some scrambling, alongside glacial lakes, remote valleys and selected runnable sections. The route passes through Dolwyddelan, Blaenau Ffestiniog and Betws Garmon before returning to Llanberis.

The race page lists a maximum race time of 32 h 30, while its own description mentions a 30-hour limit; check the runner guide. Aid stations sit at strategic points and regular intervals, with hot food and drinks at the larger ones, but no distances or intermediate cut-offs are published on the page. It suits runners who want a full day and a night in the mountains with an early-morning start.

This page covers the 2027 edition. A 05:30 start and a maximum of 32 h 30 put the last finishers in Llanberis as late as 14:00 on Sunday, after a night out on the hills. If the runner shares their own Livebib link, family and friends open it in a browser, no account and no app, and see the position on the course line, distance covered and a finish estimate that updates as the race goes, with anything estimated marked as estimated.