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Half marathons in Wales

Find half marathons in Wales in 2026/2027 - filter by date, location or category, display on a map or use the advanced search to find your perfect race.

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Come and get involved in the second St David's Day Dragon Run in the beautiful Dare Valley Country Park in, of course, Wales!
  • Sun 1 Mar
  • £16-£35
Aberdare, Mid Glamorgan, UK

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!

  • Trail run
  • 5K run
  • 10K run
  • Half marathon
  • Marathon
  • + 3 more races
  • Families
  • Beginner-friendly
  • Event village
  • Park
  • All ages
The most beautiful half marathon in North Wales! Flanked by breathtaking views of Eryri (Snowdonia), the beauty and uniqueness of this event is what draws people from all over the UK!
  • Sun 1 Mar
  • £46.99-£49.99
Anglesey, Isle of Anglesey, UK

Jones o Gymru Anglesey Half Marathon

The most beautiful half marathon in North Wales! Flanked by breathtaking views of Eryri (Snowdonia), the beauty and uniqueness of this event is what draws people from all over the UK!

  • 13.1 miles road running + 224 m ascent
  • Chip timing
  • Enter online
  • Undulating
  • PB
  • Traffic free
  • Age 17 & over
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!
  • Sun 15 Mar
  • £18-£38
Aberdare, Mid Glamorgan, UK

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!

  • Road run
  • 5K run
  • 10K run
  • Half marathon
  • Marathon
  • + 3 more races
  • Families
  • Beginner-friendly
  • Event village
  • Park
  • All ages
Gather on the summit of Moel y Parc at over 1300ft and follow the Offa's Dyke National Trail to the coast to finish line on the beach at Prestatyn.
  • Sun 12 Apr
  • £33.50
Prestatyn, Clwyd, UK

Summit 2 Sea - The Offa's Dyke Half Marathon

Gather on the summit of Moel y Parc at over 1300ft and follow the Offa's Dyke National Trail to the coast to finish line on the beach at Prestatyn.

  • 13.8 miles trail running + 2450 ft ascent
  • Beginner-friendly
  • Enter online
  • Hilly
  • Event village
  • Rural
  • Coast
  • Mountains
  • Age 17 & over
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!
  • Sun 26 Apr
  • FREE-£35
Aberdare, Mid Glamorgan, UK

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!

  • Trail run
  • 5K run
  • 10K run
  • Half marathon
  • Marathon
  • + 3 more races
  • Families
  • Beginner-friendly
  • Event village
  • Park
  • All ages
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?
  • Sat 30 May
  • £18-£35
Aberdare, Mid Glamorgan, UK

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?

  • Road run
  • 5K run
  • 10K run
  • Half marathon
  • Marathon
  • + 3 more races
  • Families
  • Beginner-friendly
  • Event village
  • Park
  • All ages
Wales' spectacular mountain half marathon! A tough route with over 1,192m of ascent, most of which is up Wales’ highest peak, with incredible views all the way to Anglesey and a downhill finish too.
  • Sun 12 Jul
  • £44.99-£49.99
Caernarfon, Gwynedd, UK

Snowdonia Trail Half Marathon Eryri

Wales' spectacular mountain half marathon! A tough route with over 1,192m of ascent, most of which is up Wales’ highest peak, with incredible views all the way to Anglesey and a downhill finish too.

  • 12.9 miles trail running + 3959 ft ascent
  • Chip timing
  • Enter online
  • Mountainous
  • Age 17 & over
Who hasn't completed a race, sworn they will never run again and then booked onto another one the following day?!
  • Sat 25 Jul
  • £16-£35
Aberdare, Mid Glamorgan, UK

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?!

  • Road run
  • 5K run
  • 10K run
  • Half marathon
  • Marathon
  • + 3 more races
  • Families
  • Beginner-friendly
  • Event village
  • Park
  • All ages
An iconic road race around Wales' capital offering a flat course from the castle to the marina and over the Cardiff Bay barrage!
  • Sun 4 Oct
  • £5-£60
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!

  • 13.1 miles road running + 81 m ascent
  • 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
Anglesey's most beautiful trail half, set in the stunning surroundings of Newborough Forest and Traeth Llanddwyn, which once hosted the Commonwealth Mountain and Ultra Distance Running Championships.
  • Sun 1 Nov
  • £39.99-£51.99
Llanfairpwllgwyngyll, Isle of Anglesey, UK

Anglesey Trail Half Marathon

Anglesey's most beautiful trail half, set in the stunning surroundings of Newborough Forest and Traeth Llanddwyn, which once hosted the Commonwealth Mountain and Ultra Distance Running Championships.

  • 21.1 km trail running + 159 m ascent
  • Chip timing
  • Enter online
  • Age 18 & over
The only way is up with this race along the Offas Dyke footpath. The scenery and terrain become more and more beautiful, and challenging as you go!
  • Sun 6 Dec
  • £38.50
Prestatyn, Clwyd, UK

Sea 2 Summit | Offa's Dyke Half Marathon

The only way is up with this race along the Offas Dyke footpath. The scenery and terrain become more and more beautiful, and challenging as you go!

  • 13.1 miles trail running
  • Chip timing
  • Enter online
  • Age 17 & over
  • Sun 1 Feb
  • £30-£35
Cardiff, UK

The Cardiff 5K, 10K and Half Marathon Winter Warmer Run | Half Marathon

  • 13.1 miles road running
  • Sun 8 Feb
  • £42
Llanelli, Dyfed, UK

Llanelli 10K & Half Marathon | Half Marathon

  • 13.1 miles road running + 58 m ascent
  • Sat 28 Feb
  • £25
Haverfordwest, Pembrokeshire, UK

Ras Dewi Sant | Half Marathon

  • 13.1 miles trail running
  • Sun 1 Mar
  • £38-£40
Newport, Gwent, UK

The KLA City of Newport Half Marathon

  • 13.1 miles road running
  • Sun 1 Mar
  • £30-£35
Cardiff, UK

St Davids Day Run | Half Marathon

  • 13.1 miles road running
  • Sun 1 Mar
  • £36-£42
Pwllheli, Gwynedd, UK

St Davids Day Celebration North Wales Pilgrims Half Marathon | Half Marathon

  • 21 km trail running
  • Sun 8 Mar
  • £42
Burry Port, Dyfed, UK

Great Welsh Marathon Events | Half Marathon

  • 13.1 miles road running + 240 ft ascent
  • Sat 14 Mar
  • £40
Carmarthen, Dyfed, UK

Brechfa Trail Races: Half Marathon & Marathon | Half Marathon

  • 13 miles trail running
  • Sun 22 Mar
  • £37-£42
Merthyr Tydfil, Mid Glamorgan, UK

The Merthyr Half Marathon | Half Marathon

  • 13.1 miles road running
  • Sun 29 Mar
  • £40-£42
Llandudno, Clwyd, UK

Llandudno Half Marathon & 10 Mile | Half Marathon

  • 13.1 miles road running
  • Sat 4 Apr
  • £28-£35
Aberdyfi, Gwynedd, UK

Aberdyfi Half Marathon | Half Marathon

  • 21.1 km trail running + 850 m ascent
  • Sun 5 Apr
  • £35
Carmarthen, Dyfed, UK

The Pendine Races | Half Marathon

  • 13.1 miles trail running
  • Sat 11 Apr
  • £39.95
Swansea, West Glamorgan, UK

RTT Gower Trail Half Marathon & 10K | Half Marathon

  • 13.1 miles trail running
  • Sat 25 Apr
  • £47
Haverfordwest, Pembrokeshire, UK

EnduranceLife - Pembrokeshire | Half Marathon

  • 13.4 miles trail running + 1578 ft ascent

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