Snowdonia Trail Marathon Eryri

Snowdonia Trail Marathon Eryri

Sunday, 12 July 2026

Llanberis, Caernarfon, UK

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The Snowdonia Trail Marathon Eryri on 12 July 2026 includes a stunning trail Marathon, Ultra, Half Marathon and 10km, based from Llanberis, Wales.

The Marathon ascends 1,685 metres over 27 miles of iconic and spectacular trails, circumnavigating and eventually climbing Wales' highest peak, Yr Wyddfa (Snowdon).

The Ultra encompasses 2,199 metres of climbing over 57km and visits the beautiful Cwm Tresgl and Cwm Pennant before rejoining the Marathon Route to ascent Yr Wyddfa.

Both the Ultra Marathon and Marathon are UTMB-indexed races.

The Half Marathon course takes in many of the fantastic trails as the Marathon, and includes over 1192 metres of ascent, most of which is up Wales’ highest peak.

The 10km is a mixture of road, track and trail and takes in the lower slopes of Snowdon, woodlands around Dolbadarn Castle, a gruelling Zig Zag to the top of Vivian Quarry and stunning forest trails all the way to the finish line.

This event is held on the same weekend as the Yr Wyddfa / Snowdon 24 Endurance Race.

Organiser

Always Aim High Events

Distances/Events

10K
Half Marathon
Marathon
57K Ultra

Location map

The event village and start & finish for all distances is in Llanberis.

Please note: the map location may be approximate. Refer to the event website for start lines and course maps.

Disclaimer

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This listing was last manually checked on 24 August 2025.

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