Trail Marathons in Wales
Find trail marathons in 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
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
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
- Sun 12 Jul
- £59.99-£64.99
Snowdonia Trail Marathon Eryri
The most epic trail marathon in Wales! Iconic and spectacular trails, circumnavigating then climbing the slopes of Wales' highest peak - Yr Wyddfa (Snowdon).
- 27.3 miles trail running + 1685 m ascent
- 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 6 Dec
- £49.50
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!
- 26.2 miles trail running
- Sat 28 Feb
- £35
Ras Dewi Sant | Full Marathon
- 26.2 miles trail running
- Sun 1 Mar
- £45
Brecon to Cardiff Xtreme & Taff Xtreme Marathon | Taff Xtreme Marathon
- 26.2 miles trail running
- Sat 14 Mar
- £50
Brechfa Trail Races: Half Marathon & Marathon | Marathon
- 26 miles trail running
- Sat 25 Apr
- £59
EnduranceLife - Pembrokeshire | Marathon
- 27.3 miles trail running + 3067 ft ascent
- Sat 9 May
- £50
Radyr Trail Races: Half Marathon and Marathon | Marathon
- 26.2 miles trail running
- Sun 20 Dec
- £27-£40
The Snow Globe Gallop Bobble Hat Run - Wales | Marathon
- 26.2 miles trail running