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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, UK

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
  • Families
  • Recycling
  • Beginner-friendly
  • Plastic bottle free
  • Dogs allowed at venue
  • Music
  • Event village
  • Event expo
  • Mountains
  • Free venue entry
  • Sustainability policy
  • Public transport links
  • Plastic-free event
  • Age 17 & over
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, UK

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
  • Beginner-friendly
  • Music
  • Event village
  • Age 17 & over
  • Sun 1 Mar
  • FREE-£42
Pwllheli, Gwynedd, UK

St Davids Day Celebration North Wales Pilgrims Half Marathon

  • Half marathon
  • Fun run
  • Sat 4 Apr
  • £28-£35
Aberdyfi, Gwynedd, UK

Aberdyfi Half Marathon | Half Marathon

  • 21.1 km trail running + 850 m ascent
  • Sat 6 Jun
  • £54-£64
Pwllheli, Gwynedd, UK

The North Wales Pilgrim Trail Marathon

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

SkyRun Eryri

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

Ring O' Fire | Firelighter 50

  • 47 miles multi terrain running
  • Sat 14 Nov
  • £61.50
Moelfre, Isle of Anglesey, UK

The Anglesey 3 Peaks Run Challenge

  • 55 km trail running

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