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Trail runs in Gwynedd

Find trail runs in Gwynedd 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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Your chance to take on one of the UK’s most demanding and spectacular trail races, set deep in the heart of Eryri (Snowdonia) National Park, offering a true mountain challenge.
  • Sat 11 - Sun 12 Jul
  • £31.99-£319.99
Caernarfon, Gwynedd

Snowdonia Trail Marathon Eryri Events

Your chance to take on one of the UK’s most demanding and spectacular trail races, set deep in the heart of Eryri (Snowdonia) National Park, offering a true mountain challenge.

  • 10K run
  • Half marathon
  • Marathon
  • Ultra run 2
Nestled in the hills of the Brecon Beacons, run or walk through wild hills on marked, rugged trails, with big views and remote landscapes in a supportive, adventure-focused trail running experience.
  • Sat 25 - Sun 26 Jul
  • FREE-£280
Brecon, Powys

Ultra X Wales

Nestled in the hills of the Brecon Beacons, run or walk through wild hills on marked, rugged trails, with big views and remote landscapes in a supportive, adventure-focused trail running experience.

  • Ultra run 4
  • Multi-terrain run 2
Immerse yourself in the stunning views of Abersoch bay at this iconic event which is well and truly on the trail running map, including 20K and 10K distances along tracks, trails and beach.
  • Fri 18 - Sat 19 Sep
  • £5-£35
Pwllheli, Gwynedd

Dioni Abersoch Coast Trail

Immerse yourself in the stunning views of Abersoch bay at this iconic event which is well and truly on the trail running map, including 20K and 10K distances along tracks, trails and beach.

  • Fun run 2
  • 10K run
  • Trail run
Anglesey's most beautiful trail race, 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
  • £28.99-£51.99
Llanfairpwllgwyngyll, Isle of Anglesey

Anglesey Trail Half Marathon & 10K

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

  • 10K run
  • Half marathon
Run the three peaks of Anglesey: a guided 55km ultra linking the island’s highest summits on spectacular coastal and inland trails, finishing at beautiful Lligwy Beach.
  • Sat 14 Nov
  • £61.50
Moelfre, Isle of Anglesey

The Anglesey 3 Peaks Run Challenge

Run the three peaks of Anglesey: a guided 55km ultra linking the island’s highest summits on spectacular coastal and inland trails, finishing at beautiful Lligwy Beach.

  • 55 km trail running
  • Sat 4 Apr
  • £28-£35
Aberdyfi, Gwynedd

Aberdyfi Half Marathon | Half Marathon

  • 21.1 km trail running + 850 m ascent
  • Sun 19 Apr
  • £24-£26
Blaenau Ffestiniog, Gwynedd

Trawsfynydd Lake Race | 8.6 Mile

  • 8.6 miles multi terrain running
  • Sat 6 Jun
  • £54-£64
Pwllheli, Gwynedd

The North Wales Pilgrim Trail Marathon

  • 42 km trail running
  • Sat 15 Aug
  • £39-£139
Caernarfon, Gwynedd

SkyRun Eryri

  • Trail run 3
  • 50K ultra run
  • Fri 4 Sep
  • £125-£150
Holyhead, Isle of Anglesey

Ring O' Fire | Firelighter 50

  • 47 miles multi terrain running

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