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Trail Half marathons in Wales in December 2025

Find trail half marathons in Wales in December 2025 - filter by date, location or category, display on a map or use the advanced search to find your perfect race.

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The only way is up with this race along the Offas Dyke footpath. The scenery and terrain become more and more beautiful, and challenging as you go!
  • Sun 7 Dec
  • £31.50
Prestatyn, Clwyd, UK

Sea 2 Summit | Offa's Dyke Half Marathon

The only way is up with this race along the Offas Dyke footpath. The scenery and terrain become more and more beautiful, and challenging as you go!

  • Chip timing
  • Enter online
  • Age 17 & over
  • 13.1 miles trail running
  • Sat 6 Dec
Crickhowell, Powys, UK

Secret Santa Figgy Pud 14K, Turkey Ten Mile & Half Marathon Du Mulled Wine | Half Marathon Du Mulled Wine

  • 13.82 miles trail running + 4013 ft ascent
  • Sat 13 Dec
Neath, West Glamorgan, UK

Celtic Trail Races | Half Marathon

  • 13 miles trail running + 2200 ft ascent

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