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Trail 10K runs in South Wales

Find trail 10k runs in South Wales in 2026/2027 - 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 get involved in the second St David's Day 10K Dragon Run in the beautiful Dare Valley Country Park in, of course, Wales!
  • Sun 1 Mar
  • £22-£27
Aberdare, Mid Glamorgan, UK

St Davids Day Dragon Run | 10K

Come and get involved in the second St David's Day 10K Dragon Run in the beautiful Dare Valley Country Park in, of course, Wales!

  • 10 km trail running
  • Enter online
  • Traffic free
  • Age 16 & over
Didn't get a ballot entry into The London Marathon? Don't panic, come and experience this 10K event instead and earn a fantastic London-themed medal!
  • Sun 26 Apr
  • £22-£27
Aberdare, Mid Glamorgan, UK

The Nearly But Not Quite London Marathon | Wales | 10K

Didn't get a ballot entry into The London Marathon? Don't panic, come and experience this 10K event instead and earn a fantastic London-themed medal!

  • 10 km trail running
  • Enter online
  • Traffic free
  • Age 16 & over
A perfect Saturday trail 10K from Penrice Castle on a loop towards Oxwich Bay then back to the event hub for a medal, a picnic lunch and to enjoy the whole Ultra Challenge atmosphere.
  • Sat 18 Jul
  • £49
Swansea, West Glamorgan, UK

Gower Peninsula Ultra Challenge | 10K Loop

A perfect Saturday trail 10K from Penrice Castle on a loop towards Oxwich Bay then back to the event hub for a medal, a picnic lunch and to enjoy the whole Ultra Challenge atmosphere.

  • 10 km multi terrain running + 250 m ascent
  • Enter online
  • Undulating
  • Age 8 & over
  • Sat 11 Apr
  • £29.95
Swansea, West Glamorgan, UK

RTT Gower Trail Half Marathon & 10K | 10K

  • 10 km trail running
  • Sun 20 Dec
  • £26-£36
Aberdare, Mid Glamorgan, UK

The Snow Globe Gallop Bobble Hat Run - Wales | 10K

  • 10 km trail running

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