A taste of Eryri's mythical mountain trails
Other trail races within 199 miles
Named after Eryri — the ancient Welsh for 'land of the eagles' — the ERYRI 25K is a 25km loop from Llanberis that visits Yr Wyddfa (Snowdon) and explores the scenic mountain trails of Eryri National Park. With 1,400m of elevation gain and a 5.5-hour cutoff, it's a challenging but accessible introduction to the UTS weekend. All finishers earn 1 Running Stone, making them eligible for the UTMB Mont-Blanc ballot.
Some ultra experience recommended
Llanberis, Wales, United KingdomMay 16, 2027
Ultra-Trail Snowdonia ERYRI 25K is a loop trail race in Llanberis, Wales, United Kingdom, held on May 16, 2027. The course covers 25 km, climbs 1,300 m, and has a 5h30m cutoff.
This edition has its own course and we haven't mapped it yet. The interactive map, elevation profile and aid stations will appear here once the route is confirmed.
We do have the 2026 route on file. We aren't showing it here, because a race's course — and sometimes its finish line — can move between editions, and a stale map is worse than no map.
Aid stations for this edition aren't published yet. They'll appear here once the route is confirmed.
Snowdon's summit weather can be dramatically different from valley conditions — expect wind, rain, and potentially low cloud
No required gear specified
No recommended gear specified
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