Half marathons in South Wales
Find half marathons in South Wales in 2025/2026 - 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 8 Nov
- £30-£35
Cardiff MoRun | Half Marathon
MoRunning brings everyday people together with the focus being to inspire you, your family, your kids and your friends to have the best time running! Get ready for the half marathon, Cardiff!
- Chip timing
- Enter online
- Flat
- Age 17 & over
- 13.1 miles road running
- Sat 22 Nov
- £22-£35
Smurf Run | Wales | Half Marathon
Come and join the day of running and aim to complete a half marathon at your own pace on a scenic course then receive a fantastic Smurf-themed medal and goody bag at the finish!
- Enter online
- Traffic free
- Age 17 & over
- 13.1 miles trail running + 0 ft ascent
- Sun 21 Dec
- £27-£40
A Christmas Carol Bobble Hat Run | Wales | Half Marathon
Welcome to a 7-hour timed running event where you can run a half marathon at your own pace on an out-and-back route, with fuel stations each lap, and a bobble hat, medal and goody bag at the finish.
- Enter online
- Age 17 & over
- 13.1 miles road running
- Sat 24 Jan 2026
- £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!
- Enter online
- Age 17 & over
- 13.1 miles trail running + 1014 ft ascent
- Sun 1 Mar 2026
- £22-£35
St Davids Day Dragon Run | Half Marathon
Come and get involved in the second St David's Day Dragon Run in the beautiful Dare Valley Country Park in, of course, Wales!
- Enter online
- Age 17 & over
- 13.1 miles trail running
- Sun 15 Mar 2026
- £24-£38
The Dashing Dog Charity Run - Wales | Half Marathon
Come and join for Dashing Dog Charity run in the beautiful Dare Valley Country Park in Wales, not only is the scenery beautiful and you will earn one of the awesome medals...
- Enter online
- Age 17 & over
- 13.1 miles road running + 135 ft ascent
- Sun 26 Apr 2026
- £22-£35
The Nearly But Not Quite London Marathon - Wales | Half Marathon
Didn't get a ballot entry into The London Marathon 2026? Don't panic, come and run with Saturn Running instead!
- Enter online
- Age 17 & over
- 13.1 miles trail running + 0 ft ascent
- Sun 4 Oct 2026
- £58
- 9 charities
Oysho Cardiff Half
An iconic road race around Wales' capital offering a flat course from the castle to the marina and over the Cardiff Bay barrage!
- Families
- Carbon offset
- Venue accessible
- Recycling
- Entertainment
- Music
- Chip timing
- Enter online
- Flat
- PB
- Traffic free
- Fancy dress
- Event village
- Urban
- Coast
- Sustainability policy
- Public transport links
- Age 17 & over
- 13.1 miles road running + 81 m ascent
- Sat 8 Nov
EnduranceLife - Gower | Half Marathon
- 14.3 miles trail running + 1916 ft ascent
- Sat 15 Nov
Margam Park Trail Races | Half Marathon
- 21.1 km trail running + 750 m ascent
- Sat 29 Nov
Machen Trail Races: Half Marathon and Marathon | Half Marathon
- 14 miles trail running + 2719 ft ascent
- Sat 13 Dec
Celtic Trail Races | Half Marathon
- 13 miles trail running + 2200 ft ascent
- Sun 1 Feb 2026
The Cardiff 5K, 10K and Half Marathon Winter Warmer Run | Half Marathon
- 13.1 miles road running
- Sun 22 Mar 2026
The Merthyr Half Marathon | Half Marathon
- 13.1 miles road running
- Sat 11 Apr 2026
RTT Gower Trail Half Marathon & 10K | Half Marathon
- 13.1 miles trail running
- Sat 9 May 2026
Radyr Trail Races: Half Marathon and Marathon | Half Marathon
- 13.1 miles trail running