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 26 Apr
- £15-£35
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
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 20 Dec
- £27-£40
The Snow Globe Gallop Bobble Hat Run - Wales | Marathon
Come and join in for the Christmas Carol Bobble Hat Run in the picturesque Dare Valley in Wales! At this event you can earn yourself a running buff as well as one of the incredible themed medals!!
- 26.2 miles trail running
- Sat 9 May
- £50
Radyr Trail Races: Half Marathon and Marathon | Marathon
- 26.2 miles trail running