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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- Sun 21 Dec
- £27-£33
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! Come and celebrate all things Spice Girls!
- Enter online
- Age 17 & over
- 13.1 miles trail running + 1014 ft ascent
- Sun 1 Mar 2026
- £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 15 Mar 2026
- £18-£38
The Dashing Dog Charity Run | Wales
Come and join the Dashing Dog Charity run in the picturesque Dare Valley Country Park. Not only is the scenery beautiful but you will earn one of these awesome medals!
- Families
- Beginner-friendly
- Event village
- Park
- All ages
- Road run
- 5K run
- 10K run
- Half marathon
- Marathon
- + 3 more races
- Sun 26 Apr 2026
- 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
- Sat 30 May 2026
- £18-£35
Rocky at 50 Run | Wales
Come and celebrate 50 years since the release of the iconic Rocky film! Have you got the Eye of The Tiger, the guts to get the glory and the will to rise up to the challenge and run?
- Families
- Beginner-friendly
- Event village
- Park
- All ages
- Road run
- 5K run
- 10K run
- Half marathon
- Marathon
- + 3 more races
- Sat 25 Jul 2026
- £16-£35
Ooops I Ran It Again | Wales
Who hasn't completed a race, sworn they will never run again and then booked onto another one the following day?!
- Families
- Beginner-friendly
- Event village
- Park
- All ages
- Road run
- 5K run
- 10K run
- Half marathon
- Marathon
- + 3 more races
- Sun 4 Oct 2026
- £5-£60
- 18 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
- 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
- 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