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Marathons in Wales in August 2026

Find marathons in Wales in August 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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Take on a stunning marathon journey along the Welsh coastline, from Aberdyfi to finish in style in Barmouth. It's an unforgettable challenge packed with scenery, heritage, and adventure.
  • Sat 15 Aug
  • £44-£45
Aberdovey, Gwynedd

Run to the Castle Ultra | Marathon

Take on a stunning marathon journey along the Welsh coastline, from Aberdyfi to finish in style in Barmouth. It's an unforgettable challenge packed with scenery, heritage, and adventure.

  • 26.2 miles multi terrain running
  • Enter online
  • Hilly
  • Age 18 & over
Who doesn't like cake?! The Great British Bake Run is back for another year with a totally unique baking competition with prizes on the day too!
  • Sat 22 Aug
  • £22-£34
Aberdare, Mid Glamorgan

Great British Bake Run | Wales | Marathon

Who doesn't like cake?! The Great British Bake Run is back for another year with a totally unique baking competition with prizes on the day too!

  • 26.2 miles road running
  • Enter online
  • Age 18 & over

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