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Runs in Caernarfon in Summer

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Welcome to the XTERRA Snowdonia Trail Marathon Eryri, a stunning Trail Marathon, Ultra Marathon, Half Marathon, 10K, and 24hr event starting and finishing in Wales' outdoor capital, Llanberis.
  • Sat 11 - Sun 12 Jul 2026
  • £31.99-£374.99
Caernarfon, Gwynedd, UK

Snowdonia Trail Marathon Eryri Events

Welcome to the XTERRA Snowdonia Trail Marathon Eryri, a stunning Trail Marathon, Ultra Marathon, Half Marathon, 10K, and 24hr event starting and finishing in Wales' outdoor capital, Llanberis.

  • Families
  • Recycling
  • Newcomers
  • Plastic bottle free
  • Music
  • Event village
  • Event expo
  • Mountains
  • Free venue entry
  • Sustainability policy
  • Public transport links
  • Plastic-free event
  • Age 17 & over
  • 10K run
  • Half marathon
  • Marathon
  • Ultra run 2

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