The most epic trail marathon in Wales
Trail Running | Snowdonia Trail Marathon Eryri 2027
Snowdonia Trail Marathon Eryri 2027 Trail Running Marathon
Starting and finishing in Llanberis, the Snowdonia Trail Marathon Eryri takes you on an unforgettable mountain journey onto and around Yr Wyddfa (Snowdon), through some of the most dramatic landscapes in North Wales.
This is a trail marathon for runners looking for something beyond the ordinary. Take on rugged mountain trails, big climbs, and exhilarating descents as you journey through the heart of Eryri, passing through spectacular valleys and mountain communities including Nant Gwynant, Beddgelert, and Rhyd Ddu. The terrain is tough, the scenery is immense, and the sense of achievement when you return to Llanberis is hard to beat.
At approximately 44km, this is more than a marathon distance. It's a proper mountain adventure, combining iconic Welsh landscapes with the challenge of running on and around the highest mountain in Wales.
And if one epic Welsh marathon isn't enough, take on two very different challenges with our City + Summit bundle, in partnership with Run 4 Wales. You'll get entry to the ABP Newport Marathon on 18 April 2027 and the Snowdonia Trail Marathon Eryri, saving up to £10 when you commit to both events.
Routes
Route Description
The revised marathon route tackles this spectacular circuit in a new direction. Leaving Llanberis behind, runners ascend the Llanberis Path of Yr Wyddfa before breaking off to descend the PYG Track, and beginning the journey into the magnificent Nant Gwynant valley. Surrounded by the high mountains of Eryri, the route combines rugged trails, sustained climbs, and exhilarating descents as it makes its way towards Beddgelert.
From this beautiful mountain village, the course continues around the western side of the Yr Wyddfa massif towards Rhyd Ddu. Here, the character of the landscape changes again, with wild mountain scenery and expansive views accompanying runners as they begin the journey back towards Llanberis.
Don't be fooled into thinking the hard work is over. The revised final section still has plenty of challenging trail running in store before you finally descend towards Llanberis and the welcome sight of the finish.
At approximately 44km, this is no ordinary marathon. Expect steep climbs, technical trails, forest tracks, fast descents, and constantly changing mountain terrain. Tough, spectacular, and immensely rewarding, the Snowdonia Trail Marathon Eryri delivers a true mountain running adventure around Wales' highest peak.
Pricing
Tier 1 Price
Ends: 13/09/2026
- £60.99 UK Athletics Affiliation
- £62.99 Non-affiliated
Tier 2 Price
Ends: 31/12/2026
- £62.99 UK Athletics Affiliation
- £64.99 Non-affiliated
Tier 3 Price
Ends: 04/07/2027
- £64.99 UK Athletics Affiliation
- £66.99 Non-affiliated
Tier 4 Price
Ends: 08/07/2027
- £67.99 UK Athletics Affiliation
- £69.99 Non-affiliated
Important Information
Age
Registration
Start Time
Cut Off Times
Feed Stations
Prizes
Mandatory Kit
Event Information
We are proud that all our events are bilingual. Signs, registration and commentary are available in English and Welsh.
Event Partners Snowdonia Trail Marathon Eryri 2027
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