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.
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- Sat 24 Jan
- £33-£35
Spice Up Your Run | Wales | Half Marathon
If you're looking to spice up your run or you need some running like you've never needed running before, then this is the event for you! Come and celebrate all things Spice Girls!
- Enter online
- Age 17 & over
- 13.1 miles trail running + 1014 ft ascent
- 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!
- Families
- Beginner-friendly
- Event village
- Park
- All ages
- Trail run
- 5K run
- 10K run
- Half marathon
- Marathon
- + 3 more races
- 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.
- Beginner-friendly
- Enter online
- Hilly
- Event village
- Rural
- Coast
- Mountains
- Age 17 & over
- 13.8 miles trail running + 2450 ft ascent
- 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!
- Families
- Beginner-friendly
- Event village
- Park
- All ages
- 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.
- Chip timing
- Enter online
- Mountainous
- Age 17 & over
- 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.
- Chip timing
- Enter online
- Age 18 & over
- 21.1 km trail running + 159 m ascent
- Sun 1 Mar
St Davids Day Celebration North Wales Pilgrims Half Marathon | Half Marathon
- 21 km trail running
- Sat 14 Mar
Brechfa Trail Races: Half Marathon & Marathon | Half Marathon
- 13 miles trail running
- Sat 4 Apr
Aberdyfi Half Marathon | Half Marathon
- 21.1 km trail running + 850 m ascent
- Sat 11 Apr
RTT Gower Trail Half Marathon & 10K | Half Marathon
- 13.1 miles trail running
- Sat 25 Apr
EnduranceLife - Pembrokeshire | Half Marathon
- 13.4 miles trail running + 1578 ft ascent
- Sat 9 May
Radyr Trail Races: Half Marathon and Marathon | Half Marathon
- 13.1 miles trail running
- Sat 6 Jun
Midnight Mountain Marathon | Half Marathon
- 13.1 miles road running + 1425 ft ascent