5
Road Half marathons in South Wales
Find road 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 15 Mar 2026
- £24-£38
Aberdare, Mid Glamorgan, UK
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 4 Oct 2026
- £5-£60
- 15 charities
Cardiff, South Glamorgan, UK
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
Cardiff, UK
The Cardiff 5K, 10K and Half Marathon Winter Warmer Run | Half Marathon
- 13.1 miles road running
- Sun 22 Mar 2026
Merthyr Tydfil, Mid Glamorgan, UK
The Merthyr Half Marathon | Half Marathon
- 13.1 miles road running