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Trail runs in Gwynedd

Find trail runs in Gwynedd in 2025/2026 - filter by date, location or category, display on a map or use the advanced search to find your perfect race.

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Select an event for photos, video, route, location, reviews, entry fees and how to enter.

  • Sun 9 Nov
Llanfairpwllgwyngyll, Isle of Anglesey, UK

Anglesey Trail Half Marathon & 10K

  • 10K run
  • Half marathon
  • Sat 15 Nov
Bangor, Gwynedd, UK

Slate Trail Ultra

  • Ultra run 2
  • Sat 4 Apr 2026
Aberdyfi, Gwynedd, UK

Aberdyfi Half Marathon | Half Marathon

  • 21.1 km trail running + 850 m ascent

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