5
Half marathons in South Wales in Spring
Find half marathons in South Wales in Spring - 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 2026
- £22-£35
Aberdare, Mid Glamorgan, UK
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 26 Apr 2026
- £22-£35
Aberdare, Mid Glamorgan, UK
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 22 Mar 2026
Merthyr Tydfil, Mid Glamorgan, UK
The Merthyr Half Marathon | Half Marathon
- 13.1 miles road running
- Sat 11 Apr 2026
Swansea, West Glamorgan, UK
RTT Gower Trail Half Marathon & 10K | Half Marathon
- 13.1 miles trail running
- Sat 9 May 2026
Cardiff, UK
Radyr Trail Races: Half Marathon and Marathon | Half Marathon
- 13.1 miles trail running