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Marathons in Gwynedd in Summer

Find marathons in Gwynedd in Summer - filter by date, location or category, display on a map or use the advanced search to find your perfect race.

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The most epic trail marathon in Wales! Iconic and spectacular trails, circumnavigating then climbing the slopes of Wales' highest peak - Yr Wyddfa (Snowdon).
  • Sun 12 Jul
  • £59.99-£64.99
Caernarfon, Gwynedd

Snowdonia Trail Marathon Eryri

The most epic trail marathon in Wales! Iconic and spectacular trails, circumnavigating then climbing the slopes of Wales' highest peak - Yr Wyddfa (Snowdon).

  • 27.3 miles trail running + 1685 m ascent
  • Chip timing
  • Enter online
  • Mountainous
  • Age 18 & over
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
  • Sat 6 Jun
  • £54-£64
Pwllheli, Gwynedd

The North Wales Pilgrim Trail Marathon

  • 42 km trail running

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