There are 44 upcoming half marathon races in Wales listed. Next up: RTT Gower Trail Half Marathon & 10K (Sunday, 18 October 2026), Phoenix South Wales - Zombie Run (Saturday, 31 October 2026), The Cardiff 1.5k, 5k, 10k & Half Marathon MoRun (Sunday, 1 November 2026).
Upcoming races only, soonest first. Confirm dates and entry details with the organiser.
Oxwich · Oxwich Bay, Swansea, Wales, SA3 1LS
Coastal trail events from Oxwich Bay on the Gower Peninsula. The half marathon requires self-navigation; the 5K and 10K routes are marked. Starts and registration closing times differ by distance.
£21.99–£41.99
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Pontypridd · Bike Doctor, Pontypridd, CF37 2PE, United Kingdom
Phoenix South Wales - Zombie Run is organised by Phoenix Running South Wales in Pontypridd. Entry options: 7 Hour Timed Challenge Including 5km, 10km, Half Marathon, Marathon, Ultra; NO MEDAL - 7 Hour Timed Event Including 5km, 10km, Half Marathon, Marathon, Ultra.
£22–£35
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Cardiff · North Road, Cardiff CF10 3DX, UK
The Cardiff 1.5k, 5k, 10k & Half Marathon MoRun is organised by The Fix Events UK in Cardiff. Entry options: 5k MoRun; 10k MoRun; Half Marathon. The course surface has not been confirmed.
£30–£35
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Brecon · Talybont-on-Usk, Brecon, Wales, United Kingdom
Beacons Ultra, Marathon & Half Marathon is organised by Andali Events in Brecon. Entry options: Beacons Ultra; Beacons Trail Marathon; Beacons Half Marathon.
£40–£80
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Swansea · Oxwich, Swansea, SA1 1, United Kingdom
Endurancelife Gower is organised by Endurancelife in Swansea. Entry options: 10K; Half Marathon; Marathon; Ultra. The course surface has not been confirmed.
£35–£71
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Oxwich · Oxwich Bay
Coastal trail races based around Oxwich, with 10 km, half-marathon, marathon and ultra categories. Route lengths can differ from standard road-race distances; check the organiser’s course and kit requirements.
£35–£71
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Cardiff · Harbour Drive, Cardiff, CF10 4, United Kingdom
Phoenix South Wales - Lest We Forget 2026 is organised by Phoenix Running South Wales in Cardiff. Entry options: 7 Hour Timed Event Including 5km, 10km, Half Marathon, Marathon, Ultra.
£35
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Port Talbot · Margam Park East gate,
Trail Half Marathon Wales takes place in Port Talbot on 14 November 2026. Organised by Trail Revolution. Published venue: Margam Park East gate,. Check the organiser’s booking page for the full route, start arrangements, age requirements and current entry conditions.
£34–£38
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Conwy · Bridge by Conwy Quayside
A road half marathon from Conwy through Deganwy and Llandudno, around the Great Orme and back to the castle. Expect hills on the Orme and coastal views along the route.
Price not confirmed
Aberdare · Dare Valley Country Park, Aberdare, CF44 7PS
Timed running challenge at Dare Valley Country Park, with distances from 3 km to ultra. Runners and walkers are welcome; age-based distance limits apply.
£18–£34
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Llanferres · Loggerheads Country Park
A half marathon on three laps of a 7K loop at Loggerheads Country Park, with a three-person relay option. The event has a 3.5-hour cut-off and marked trail routes.
£35
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Caerphilly · Machen Village Hall & Social Centre, The Crescent, Caerphilly, CF83 8ND, United Kingdom
Machen Trail Races: Half and Full Marathons is organised by Ridge Runners in Caerphilly. Entry options: Machen Trail Races: Marathon; Machen Trail Races: Half Marathon.
£40–£50
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Treharris · Taff Bargoed Angling Association, Treharris, CF46 6RD, United Kingdom
Phoenix South Wales - Cheeky Fox is organised by Phoenix Running South Wales in Treharris. Entry options: 7 Hour Timed event including 5km, 10km, Half Marathon, Marathon, Ultra.
£35
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Merthyr Tydfil · CF48 1UT, Merthyr Tydfil, United Kingdom
Phoenix South Wales - Christmas Advent Run is organised by Phoenix Running South Wales in Merthyr Tydfil. Entry options: 7 Hour Timed Event Including 5km, 10km, Half Marathon, Marathon, Ultra.
£35
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Prestatyn · Prestatyn Nova Centre
Sea 2 Summit - Offa's Dyke Half/Full/Ultra takes place in Prestatyn on 06 December 2026. Organised by Out Fit. Published venue: Prestatyn Nova Centre. Check the organiser’s booking page for the full route, start arrangements, age requirements and current entry conditions.
£38.50–£59.50
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Aberdare · Dare Valley Country Park
Trail Race organised by Run Walk Crawl in Aberdare. Minimum age: 18 or older. Online entry deadline: Wednesday 16th September 2026 at 08:00. Published meeting-location reference: ///horns.grumbles.award. Race HQ and finish are at Dare Valley Country Park; the half marathon starts in Resolven.
£42–£62
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Aberdare · Dare Valley Country Park, Aberdare, CF44 7PS
The Snow Globe Gallop Bobble Hat Run - Wales takes place in Aberdare on 20 December 2026. Organised by Saturn Running. Published venue: Dare Valley Country Park, Aberdare, CF44 7PS. Check the organiser’s booking page for the full route, start arrangements, age requirements and current entry conditions.
£18–£39
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Pontypridd · Connected Kerb, Gyfeillon Road, Pontypridd, CF37 2PP, United Kingdom
Phoenix South Wales - Frozen Phoenix 2026 is organised by Phoenix Running South Wales in Pontypridd. Entry options: 7 Hour Timed event including 5km, 10km, Half Marathon, Marathon, Ultra.
£35
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Chepstow · Chepstow Racecourse, Chepstow, Monmouthshire, NP16 6EH
Races at Chepstow Racecourse on a mixture of tarmac and trail, starting and finishing in front of the grandstand.
£29.40–£35.70
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Aberdare · Dare Valley Country Park, Aberdare, CF44 7PS
The Milkshake Meander - Wales takes place in Aberdare on 24 January 2027. Organised by Saturn Running. Published venue: Dare Valley Country Park, Aberdare, CF44 7PS. Check the organiser’s booking page for the full route, start arrangements, age requirements and current entry conditions.
£18–£35
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Cardiff · Bute Park, North Road, Cardiff, UK
The Cardiff 5k, 10k and Half Marathon Winter Warmer Run is organised by The Fix Events UK in Cardiff. Entry options: 5 km; 10 km; Half Marathon. The course surface has not been confirmed.
£25–£30
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Tudweiliog · Cwt Tatws
Dydd Gŵyl Dewi Half Marathon 2027 takes place in Tudweiliog on 28 February 2027. Check the organiser’s page for the route, start arrangements and eligibility.
£39.95
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Aberdare · Dare Valley Country Park, Dare, Aberdare, Wales, CF44 7PS
St David's Day Dragon Run 2027 takes place in Aberdare on 28 February 2027. Organised by Saturn Running. Published venue: Dare Valley Country Park, Dare, Aberdare, Wales, CF44 7PS. Check the organiser’s booking page for the full route, start arrangements, age requirements and current entry conditions.
£18–£35
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Wrexham · Queensway Stadium, Wrexham LL13 8UH, UK
A closed-road race starting and finishing at Queensway Stadium.
£50.40
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Carmarthen · Keeper's Lodge, Carmarthen, SA32 7, United Kingdom
Brechfa Trail Races is organised by Ridge Runners in Carmarthen. Entry options: Brechfa Forest Half; Brehfa Forest Marathon.
£45–£55
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Aberdare · Dare Valley Country Park, Aberdare, CF44 7PS
Running 9 to 5 - Wales takes place in Aberdare on 14 March 2027. Organised by Saturn Running. Published venue: Dare Valley Country Park, Aberdare, CF44 7PS. Check the organiser’s booking page for the full route, start arrangements, age requirements and current entry conditions.
£18–£35
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Llandudno · Venue Cymru, Llandudno
Llandudno Half Marathon & 10 Mile takes place in Llandudno on 21 March 2027. Organised by Run Wales. Published venue: Venue Cymru, Llandudno. Check the organiser’s booking page for the full route, start arrangements, age requirements and current entry conditions.
£42
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Swansea · Oystermouth Road
Mizuno Swansea Half Marathon 2027 takes place in Swansea on 21 March 2027. Check the organiser’s page for the route, start arrangements and eligibility.
Price not confirmed
Pontypridd · Connected Kerb, Gyfeillon Road, Pontypridd, CF37 2PP, United Kingdom
Phoenix South Wales - Hedgie Hog Jog is organised by Phoenix Running South Wales in Pontypridd. Entry options: 7 Hour Timed event including 5km, 10km, Half Marathon, Marathon, Ultra.
£35
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Merthyr Tydfil · Merthyr College, Merthyr Tydfil
Road Race organised by The Merthyr Tydfil Half Marathon in Merthyr Tydfil. Online entry deadline: Sunday 28th March 2027. Published meeting-location reference: ///truck.fluid.gums.
£41–£43
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Prestatyn · Nova Centre, Prestatyn
Summit 2 Sea - The Offa's Dyke Half Marathon takes place in Prestatyn on 11 April 2027. Organised by Out Fit. Published venue: Nova Centre, Prestatyn. Check the organiser’s booking page for the full route, start arrangements, age requirements and current entry conditions.
£36.50
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Carmarthen · Pendine Sands, Carmarthen, UK
The Pendine Sands Races is organised by Every Mile Counts in Carmarthen. Entry options: Half Marathon; 10 km; 5 km. The course surface has not been confirmed.
£30–£40
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Haverfordwest · Little Haven, Haverfordwest, Wales, United Kingdom
Endurancelife Pembrokeshire is organised by Endurancelife in Haverfordwest. Entry options: 10K; Half Marathon; Marathon; Ultra.
£35–£71
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Llanrwst · Llanrwst
Snowdonia Half Marathon takes place in Llanrwst on 09 May 2027. Organised by Run Wales. Published venue: Llanrwst. Check the organiser’s booking page for the full route, start arrangements, age requirements and current entry conditions.
£46
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Margam · Margam Country Park, Wales
MARGAM PARK - WILD TRAIL RUNS 2027 takes place in Margam on 23 May 2027. Organised by Wild Deer Events. Published venue: Margam Country Park, Wales. Check the organiser’s booking page for the full route, start arrangements, age requirements and current entry conditions.
£24–£28
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Treharris · B4255, Treharris, CF46 6, United Kingdom
PHOENIX - South Wales - D-Day Military Series Run is organised by Phoenix Running South Wales in Treharris. Entry options: 7 Hour Timed event including 5km, 10km, Half Marathon, Marathon, Ultra; NO MEDAL - 7 hour timed challenge including 5km, 10km, Half Marathon, Marathon, Ultra.
£22–£35
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Bangor · Bangor, Gwynedd, North Wales. LL57 1NW
Bangor City 10K & Half Marathon takes place in Bangor on 13 June 2027. Organised by Run Wales. Published venue: Bangor, Gwynedd, North Wales. LL57 1NW. Check the organiser’s booking page for the full route, start arrangements, age requirements and current entry conditions.
£36–£48
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Prestatyn · The Nova
Nova Coast Half Marathon 2027 takes place in Prestatyn on 27 June 2027. Check the organiser’s page for the route, start arrangements and eligibility.
£34.65–£36.75
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Llanberis · Llanberis
Snowdonia Trail Half Marathon Eryri takes place in Llanberis on 11 July 2027. Organised by Always Aim High Events. A mountain half marathon starting and finishing in Llanberis, with approximately 1,250 metres of climbing. Start time will be confirmed in final instructions. Check the organiser for final race-day instructions.
£47.99–£49.99
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Chepstow · Chepstow Racecourse, Chepstow, Monmouthshire, NP16 6EH
Races at Chepstow Racecourse on a mixture of tarmac and trail, starting and finishing in front of the grandstand.
£29.40–£35.70
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Ffairfach · Ysgol Bro Dinefwr, Ysgol Bro Dinefwr, Ffairfach, Llandeilo, SA19 6PE
A 21.1km road half-marathon through the Tywi Valley, starting at Ysgol Bro Dinefwr in Ffairfach. Separate Friday festival races have been announced, but their dates and entry details are not confirmed.
£28.88–£36.46
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Caernarfon · Caernarfon
Caernarfon Half Marathon takes place in Caernarfon on 05 September 2027. Organised by Run Wales. Published venue: Caernarfon. Check the organiser’s booking page for the full route, start arrangements, age requirements and current entry conditions.
£47
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Dale · Dale, Haverfordwest, SA62 3RB
Pembrokeshire Half Marathon & 10K takes place in Dale on 26 September 2027. Organised by Pembrokeshire Tri Club. Published venue: Dale, Haverfordwest, SA62 3RB. Check the organiser’s booking page for the full route, start arrangements, age requirements and current entry conditions.
£30–£35
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Cardiff
One of the UK's biggest half marathons, through the Welsh capital.
Price not confirmed
Work out your target half marathon time and pace.