Snowdonia Trail Marathon Eryri 2026
Welcome to the Snowdonia Trail Marathon Eryri, a stunning Trail Marathon, Ultra Marathon, Half Marathon and 10k, starting and finishing in Wales' outdoor capital, Llanberis. Entering the Snowdonia Trail Marathon Eryri is your ticket to compete in one of the UK's most challenging trail races.
The incredible routes explore the trails, gorgeous panoramic views and tough climbs that make Eryri (Snowdonia) National Park so popular with outdoor enthusiasts. Visiting Rhyd Ddu, Beddgelert, Nant Gwynant, Pen y Pass, and Yr Wyddfa (Snowdon), there surely can't be a more striking trail marathon route in the UK!
The Ultra Marathon and Marathon are also both ITRA & UTMB-indexed races.
DRAGONS' DASH
Get the little ones involved with the Jones o Gymru Dolbadarn Dash — a lively 500m kids’ fun run on the event field.
Entry: £3 suggested donation (enter on the day)
All proceeds go directly to support the Llanberis Mountain Rescue Team
Race timing: To be confirmed — check back soon for updates!
It’s a great way for young runners to get active and support a fantastic local cause. Bring the family and cheer them on!
Choose your distance
- 10K - 9.8 km
- Half Marathon - 12.9 miles
- Marathon - 27.3 miles
- Ultra Marathon - 57 km
What's Included
- Lively Event Village: Music, commentary, shopping, food, kit demos and toilets
- Family Friendly Vibes: Family finishes and plenty to see and do
- On Course Support: Friendly marshals, signage, energy stations and support vehicles
- Unique Finisher Mementos!: Beautifully designed to reflect our event locations and local history.
- Spectacular Scenery: Unbeatable views across Eryri (Snowdonia)
- Professional Timing: Chip timing, and live online results