Trail Half marathons in Wales
Find trail half 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.
Filter by place
Filter by date
Filter by category
MapEvent listings
Select an event for photos, video, route, location, reviews, entry fees and how to enter.
- Sun 12 Apr
- £33.50
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.
- 13.8 miles trail running + 2450 ft ascent
- 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
- Sun 12 Jul
- £44.99-£49.99
Snowdonia Trail Half Marathon Eryri
Wales' spectacular mountain half marathon! A tough route with over 1,192m of ascent, most of which is up Wales’ highest peak, with incredible views all the way to Anglesey and a downhill finish too.
- 12.9 miles trail running + 3959 ft ascent
- Sun 1 Nov
- £39.99-£51.99
Anglesey Trail Half Marathon
Anglesey's most beautiful trail half, set in the stunning surroundings of Newborough Forest and Traeth Llanddwyn, which once hosted the Commonwealth Mountain and Ultra Distance Running Championships.
- 21.1 km trail running + 159 m ascent
- Sat 28 Nov
- £35-£60.50
Loggerheads Half Marathon
Take on a scenic, looped, North Wales trail challenge with varied terrain, lots of support through Loggerheads Country Park, and the option to race solo or in a three-person relay.
- 13.1 miles trail running
- Sun 6 Dec
- £38.50
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!
- 13.1 miles trail running
- Sun 20 Dec
- £27-£40
The Snow Globe Gallop Bobble Hat Run - Wales | Half 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!!
- 13.1 miles trail running
- Sat 25 Apr
- £47
EnduranceLife - Pembrokeshire | Half Marathon
- 13.4 miles trail running + 1578 ft ascent
- Sat 9 May
- £40
Radyr Trail Races: Half Marathon and Marathon | Half Marathon
- 13.1 miles trail running
- Sat 6 Jun
- £45
Midnight Mountain Marathon | Half Marathon
- 13.1 miles road running + 1425 ft ascent