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Trail Half marathons in Gwynedd

Find trail half marathons 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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  • Sun 12 Jul 2026
Caernarfon, Gwynedd, UK

Snowdonia Trail Half Marathon Eryri

  • 12.9 miles trail running + 3959 ft 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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