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Trail Marathons in Wales

Find trail marathons in Wales 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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Come and join the day of running and aim to complete a marathon at your own pace on a scenic course then receive a fantastic Smurf-themed medal and goody bag at the finish!
  • Sat 22 Nov
  • £22-£35
Aberdare, Mid Glamorgan, UK

Smurf Run | Wales | Marathon

Come and join the day of running and aim to complete a marathon at your own pace on a scenic course then receive a fantastic Smurf-themed medal and goody bag at the finish!

  • Enter online
  • Traffic free
  • Age 18 & over
  • 26.2 miles trail running + 0 ft ascent
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
  • £41.50
Prestatyn, Clwyd, UK

Sea 2 Summit | Offa's Dyke Full 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 18 & over
  • 26.2 miles trail running
If you're looking to spice up your run or you need some running like you've never needed running before, then this is the event for you!
  • Sat 24 Jan 2026
  • £33-£35
Aberdare, Mid Glamorgan, UK

Spice Up Your Run - Wales | Marathon

If you're looking to spice up your run or you need some running like you've never needed running before, then this is the event for you!

  • Enter online
  • Age 18 & over
  • 26.2 miles trail running + 2028 ft ascent
Come and get involved in the second St David's Day Dragon Run in the beautiful Dare Valley Country Park in, of course, Wales!
  • Sun 1 Mar 2026
  • £22-£35
Aberdare, Mid Glamorgan, UK

St Davids Day Dragon Run | Marathon

Come and get involved in the second St David's Day Dragon Run in the beautiful Dare Valley Country Park in, of course, Wales!

  • Enter online
  • Age 18 & over
  • 26.2 miles trail running
Didn't get a ballot entry into The London Marathon 2026? Don't panic, come and run with Saturn Running instead!
  • Sun 26 Apr 2026
  • £22-£35
Aberdare, Mid Glamorgan, UK

The Nearly But Not Quite London Marathon - Wales | Marathon

Didn't get a ballot entry into The London Marathon 2026? Don't panic, come and run with Saturn Running instead!

  • Enter online
  • Age 18 & over
  • 26.2 miles trail running + 0 ft ascent
  • Sat 8 Nov
Swansea, West Glamorgan, UK

EnduranceLife - Gower | Marathon

  • 27.4 miles trail running + 3425 ft ascent
  • Sat 29 Nov
Caerphilly, Gwent, UK

Machen Trail Races: Half Marathon and Marathon | Marathon

  • 26 miles trail running + 4760 ft ascent
  • Sat 13 Dec
Grecynon, Mid Glamorgan, UK

Celtic Trail Races | Marathon

  • 26 miles trail running + 3050 ft ascent
  • Sat 28 Feb 2026
Haverfordwest, Pembrokeshire, UK

Ras Dewi Sant | Full Marathon

  • 26.2 miles trail running
  • Sat 14 Mar 2026
Carmarthen, Dyfed, UK

Brechfa Trail Races: Half Marathon & Marathon | Marathon

  • 26 miles trail running
  • Sun 5 Apr 2026
Carmarthen, Dyfed, UK

The Pendine Races | Marathon

  • 26.2 miles trail running
  • Sat 9 May 2026
Cardiff, UK

Radyr Trail Races: Half Marathon and Marathon | Marathon

  • 26.2 miles trail running

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