There are 28 upcoming marathon races in Wales listed. Next up: Marathon Eryri (Saturday, 24 October 2026), Phoenix South Wales - Zombie Run (Saturday, 31 October 2026), Beacons Ultra, Marathon & Half Marathon (Saturday, 7 November 2026).
Upcoming races only, soonest first. Confirm dates and entry details with the organiser.
Llanberis · Race headquarters: former Electric Mountain Visitor Centre, Llanberis, LL55 4TA
Mountainous marathon around Yr Wyddfa, mainly on roads with farm-track and unmetalled sections. Starts on the A4086 outside Llanberis and finishes in the village. Ballot entry and transfers have closed.
£50
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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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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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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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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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Aberdyfi · Aberdovey Village Hall, Neuadd Dyfi, Aberdyfi, Aberdovey LL35 0NR
The Winter Run to the Castle Ultra takes place in Aberdyfi on 16 January 2027. Organised by How Hard Can It Be Events. Published venue: Aberdovey Village Hall, Neuadd Dyfi, Aberdyfi, Aberdovey LL35 0NR. Check the organiser’s booking page for the full route, start arrangements, age requirements and current entry conditions.
£45–£66
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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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Nantgarw · Coleg y Cymoedd, Heol Cronchendy, Parc Nantgarw, Nantgarw, Wales
Brecon to Cardiff Xtreme & Taff Xtreme Marathon takes place in Nantgarw on 14 February 2027. Check the organiser’s page for the route, start arrangements and eligibility.
£53.42–£95.82
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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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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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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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Brecon
Ultra Running organised by Run Walk Crawl in Brecon. The event runs from 2027-04-02 to 2027-04-03. Minimum age: 18 or older. Online entry deadline: Wednesday 16th September 2026 at 20:00. Published meeting-location reference: ///unloaded.liberty.awoken.
£50–£99
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Newport
A flat festival of running in Newport with marathon, 10K and mile races.
Price not confirmed
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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Merthyr Tydfil · Parkwood Dolygaer, Merthyr Tydfil, CF48 2UR
Trail Race organised by OTT Events Limited in Merthyr Tydfil. Minimum age: 18 or older. Online entry deadline: Saturday 8th May 2027. Published meeting-location reference: ///mandolin.campers.stump.
£23–£59
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Aberdare · Dare Valley Country Park, Aberdare, CF44 7PS
Welsh Festival Of Running - Pure24 takes place in Aberdare on 29 May 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.
£34–£120
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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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Aberdyfi · Aberdovey Village Hall, Aberdovey LL35 0NR
Run to the Castle Ultra takes place in Aberdyfi on 14 August 2027. Organised by How Hard Can It Be Events. Published venue: Aberdovey Village Hall, Aberdovey LL35 0NR. Check the organiser’s booking page for the full route, start arrangements, age requirements and current entry conditions.
£45–£70
See entry options & fees
Work out your target marathon time and pace.