Half marathons in South Wales

Find half marathons near me in South Wales for 2025/2026 - filter by date or location, display on a map or use the advanced search to find your perfect race.

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Welcome to a 7-hour timed running event where you can run a half marathon at your own pace on a looped route, with fuel stations each lap, and a medal and goody bag at the finish.

Sat 20 Sep
£22-£35

Aberdare, Mid Glamorgan, UK

Fraggle Run | Wales | Half Marathon

Welcome to a 7-hour timed running event where you can run a half marathon at your own pace on a looped route, with fuel stations each lap, and a medal and goody bag at the finish.

Enter online
Traffic free
Age 17 & over

13.1 miles trail running

Entries closed

An iconic road race around Wales' capital offering a flat course from the castle to the marina and over the Cardiff Bay barrage!

Sun 5 Oct
FREE-£45

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
Wheelchair users
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

Come and join Saturn Too for our spooky Scare Bear Run!

Sat 18 Oct
£22-£35

Aberdare, Mid Glamorgan, UK

Scare Bear Run - Wales | Half Marathon

Come and join Saturn Too for our spooky Scare Bear Run!

Enter online
Age 17 & over

13.1 miles road running

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!

Sat 8 Nov
£30-£35

Cardiff, UK

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

Come and join this Smurf Run at the picturesque Dare Valley in Wales! Who doesn't love those little blue characters and therefore a medal reflecting how adorable they are!

Sat 22 Nov
£22-£35

Aberdare, Mid Glamorgan, UK

Smurf Run - Wales | Half Marathon

Come and join this Smurf Run at the picturesque Dare Valley in Wales! Who doesn't love those little blue characters and therefore a medal reflecting how adorable they are!

Enter online
Age 17 & over

13.1 miles trail running + 0 ft ascent

Come and join in Christmas Carol Bobble Hat Run in the picturesque Dare Valley in Wales! At this event you can earn yourself a bobble hat as well as one of the incredible themed medals!!

Sun 21 Dec
£27-£40

Aberdare, Mid Glamorgan, UK

A Christmas Carol Bobble Hat Run - Wales | Half Marathon

Come and join in Christmas Carol Bobble Hat Run in the picturesque Dare Valley in Wales! At this event you can earn yourself a bobble hat as well as one of the incredible themed medals!!