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Trail Half marathons in Wales

Find trail half 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 half 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 | Half Marathon

Come and join the day of running and aim to complete a half 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 17 & over
  • 13.1 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
  • £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
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 | Half 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 17 & over
  • 13.1 miles trail running + 1014 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 | Half 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 17 & over
  • 13.1 miles trail running
Gather on the summit of Moel y Parc at over 1300ft and follow the Offa's Dyke National Trail to the coast to finish line on the beach at Prestatyn.
  • Sun 12 Apr 2026
  • £33.50
Prestatyn, Clwyd, UK

Summit 2 Sea - The Offa's Dyke Half Marathon

Gather on the summit of Moel y Parc at over 1300ft and follow the Offa's Dyke National Trail to the coast to finish line on the beach at Prestatyn.

  • Newcomers
  • Enter online
  • Hilly
  • Event village
  • Rural
  • Coast
  • Mountains
  • Age 17 & over
  • 13.8 miles trail running + 2450 ft ascent
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 | Half 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 17 & over
  • 13.1 miles trail running + 0 ft ascent
  • Sat 18 Oct
Port Talbot, West Glamorgan, UK

Afan forest Half Marathon and 10K | Half Marathon

  • 13.1 miles trail running
  • Sun 19 Oct
Llanwrtyd Wells, Powys, UK

Ron Skilton Memorial Half Marathon | Half Marathon

  • 13 miles trail running
  • Sat 8 Nov
Swansea, West Glamorgan, UK

EnduranceLife - Gower | Half Marathon

  • 14.3 miles trail running + 1916 ft ascent
  • Sun 9 Nov
Llanfairpwllgwyngyll, Isle of Anglesey, UK

Anglesey Trail Half Marathon & 10K | Half Marathon

  • 21.1 km trail running + 544 ft ascent
  • Sat 15 Nov
Port Talbot, West Glamorgan, UK

Margam Park Trail Races | Half Marathon

  • 21.1 km trail running + 750 m ascent
  • Sun 16 Nov
Cardiff, UK

Cardiff Trail Half Marathon

  • 13.1 miles trail running
  • Sat 29 Nov
Mold, Clwyd, UK

Loggerheads Half Marathon

  • 13.1 miles trail running
  • Sat 29 Nov
Caerphilly, Gwent, UK

Machen Trail Races: Half Marathon and Marathon | Half Marathon

  • 14 miles trail running + 2719 ft ascent
  • 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
  • Sat 28 Feb 2026
Haverfordwest, Pembrokeshire, UK

Ras Dewi Sant | Half Marathon

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

Brechfa Trail Races: Half Marathon & Marathon | Half Marathon

  • 13 miles trail running
  • Sat 4 Apr 2026
Aberdyfi, Gwynedd, UK

Aberdyfi Half Marathon | Half Marathon

  • 21.1 km trail running + 850 m ascent
  • Sun 5 Apr 2026
Carmarthen, Dyfed, UK

The Pendine Races | Half Marathon

  • 13.1 miles trail running
  • Sat 11 Apr 2026
Swansea, West Glamorgan, UK

RTT Gower Trail Half Marathon & 10K | Half Marathon

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

Radyr Trail Races: Half Marathon and Marathon | Half Marathon

  • 13.1 miles trail running

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