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Trail runs in Gwynedd

Find trail runs near me in Gwynedd for 2025/2026 - filter by date or location, 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 | Half Marathon

  • 21.1 km trail running + 544 ft ascent
  • Sun 9 Nov
Llanfairpwllgwyngyll, Isle of Anglesey, UK

Anglesey Trail Half Marathon & 10K | 10K

  • 10 km trail running + 308 ft ascent
  • Sat 15 Nov
Bangor, Gwynedd, UK

Slate Trail Ultra | Slate Trail Ultra

  • 145 km trail running + 3900 m ascent
  • Sat 15 Nov
Bangor, Gwynedd, UK

Slate Trail Ultra | Ultra Tour of The Quarries

  • 88 km trail running + 2700 m ascent
  • Sat 4 Apr 2026
Aberdyfi, Gwynedd, UK

Aberdyfi Half Marathon | Half Marathon

  • 21.1 km trail running + 850 m ascent

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