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Trail Marathons in South Wales
Find trail marathons 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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- Sun 1 Mar
- £16-£35
Aberdare, Mid Glamorgan, UK
St Davids Day Dragon Run
Come and get involved in the second St David's Day Dragon Run in the beautiful Dare Valley Country Park in, of course, Wales!
- Trail run
- 5K run
- 10K run
- Half marathon
- Marathon
- + 3 more races
- Sun 26 Apr
- FREE-£35
Aberdare, Mid Glamorgan, UK
The Nearly But Not Quite London Marathon | Wales
Didn't get a ballot entry into The London Marathon? Don't panic, come and experience this event instead and earn a fantastic London-themed medal!
- Trail run
- 5K run
- 10K run
- Half marathon
- Marathon
- + 3 more races
- Sat 18 Jul
- £89
Swansea, West Glamorgan, UK
Gower Peninsula Ultra Challenge | Marathon 42K Loop
A classic distance from Penrice Castle on a loop featuring Oxwich Bay and its nature reserve, the stunning Wales Coast Path, picnic at Rhossili, the Gower Way then a celebration and medal!
- 42 km multi terrain running + 900 m ascent
- Sun 1 Mar
- £45
Merthyr Tydfil, Mid Glamorgan, UK
Brecon to Cardiff Xtreme & Taff Xtreme Marathon | Taff Xtreme Marathon
- 26.2 miles trail running
- Sat 9 May
- £50
Cardiff, UK
Radyr Trail Races: Half Marathon and Marathon | Marathon
- 26.2 miles trail running
- Sun 20 Dec
- £27-£40
Aberdare, Mid Glamorgan, UK
The Snow Globe Gallop Bobble Hat Run - Wales | Marathon
- 26.2 miles trail running