Snowdonia Trail Marathon Eryri
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Event overview
The Snowdonia Trail Marathon Eryri is a trail running event in Llanberis, North Wales, on 12 July 2026. Routes explore trails, panoramic views and climbs in Eryri (Snowdonia) National Park, and visit Rhyd Ddu, Beddgelert, Nant Gwynant, Pen y Pass and Yr Wyddfa (Snowdon). The marathon and ultra marathon are UTMB-indexed. The event is bilingual, with signs, registration and commentary available in English and Welsh.
Races and event features
Distances offered:
- 10k: 9.8 km
- Half Marathon: 12.9 miles
- Marathon: 27.3 miles
- Ultra Marathon: 57 km
A 500 m kids fun run, the Jones o Gymru Dolbadarn Dash, takes place on the event field. Entry on the day includes a suggested £3 donation; proceeds go to the Llanberis Mountain Rescue Team. The event village includes music, commentary, shopping, food, kit demos and toilets. On-course support includes marshals, signage, energy stations and support vehicles. Chip timing and live online results are provided, and finishers receive event mementos. Visit the organization's website for the most recent information.
