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Trail runs in Gwynedd

Find trail runs near me in Gwynedd for 2025/2026 - search by date or place, display on a map or use the advanced search to find your perfect race.

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Events near me

Click an event for full event details, location, route, sustainability, what's included and how to enter.

The original Snowdonia Ultra Marathon. A beautiful route boasting stunning views, a hearty ascent of Yr Wyddfa (Snowdon) and a thrilling 7km descent to a heroes' welcome at the finish line!
  • Sat 12 Jul
  • £94.99-£104.99
  • Sat 12 Jul
  • £94.99-£104.99
Caernarfon, Gwynedd, UK

XTERRA Snowdonia Ultra Trail Marathon Eryri

The original Snowdonia Ultra Marathon. A beautiful route boasting stunning views, a hearty ascent of Yr Wyddfa (Snowdon) and a thrilling 7km descent to a heroes' welcome at the finish line!

  • Chip timing
  • Enter online
  • Mountainous
  • Age 20 & over
  • 57 km trail running + 7257 ft ascent
The most epic trail marathon in Wales! Iconic and spectacular trails, circumnavigating then climbing the slopes of Wales' highest peak - Yr Wyddfa (Snowdon).
  • Sat 12 Jul
  • £57.99-£61.99
  • Sat 12 Jul
  • £57.99-£61.99
Caernarfon, Gwynedd, UK

XTERRA 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).

  • Chip timing
  • Enter online
  • Mountainous
  • Age 18 & over
  • 27.3 miles trail running + 5482 ft ascent
A beautiful 10K with something for all runners on a mixture of road, track and trail and takes in the beautiful lower slopes of Yr Wyddfa (Snowdon), with a stunning downhill to the finish line.
  • Sat 12 Jul
  • £31.99-£37.99
  • Sat 12 Jul
  • £31.99-£37.99
Caernarfon, Gwynedd, UK

XTERRA Snowdonia Trail 10K Eryri

A beautiful 10K with something for all runners on a mixture of road, track and trail and takes in the beautiful lower slopes of Yr Wyddfa (Snowdon), with a stunning downhill to the finish line.

  • Chip timing
  • Enter online
  • Hilly
  • Age 17 & over
  • 9.8 km trail running + 1335 ft ascent
Wales' spectacular mountain half marathon! A tough route with over 1,192m of ascent, most of which is up Wales’ highest peak, with incredible views all the way to Anglesey and a downhill finish too.
  • Sat 12 Jul
  • £44.99-£49.99
  • Sat 12 Jul
  • £44.99-£49.99
Caernarfon, Gwynedd, UK

XTERRA Snowdonia Trail Half Marathon Eryri

Wales' spectacular mountain half marathon! A tough route with over 1,192m of ascent, most of which is up Wales’ highest peak, with incredible views all the way to Anglesey and a downhill finish too.

  • Chip timing
  • Enter online
  • Mountainous
  • Age 17 & over
  • 12.9 miles trail running + 3959 ft ascent
Yr Wyddfa (Snowdon) is the highest mountain in England and Wales. Your challenge is to ascend and descend as many times as possible in 24 hours - solo or as a relay team.
  • Sat 12 - Sun 13 Jul
  • £121.99-£251.99
  • Sat 12 - Sun 13 Jul
  • £121.99-£251.99
Caernarfon, Gwynedd, UK

Black Diamond Yr Wyddfa Snowdon24

Yr Wyddfa (Snowdon) is the highest mountain in England and Wales. Your challenge is to ascend and descend as many times as possible in 24 hours - solo or as a relay team.

  • Chip timing
  • Enter online
  • Mountainous
  • Relay
  • Age 18 & over
  • 24 hrs trail running + 3182 ft ascent
This new Ultra distance event urges you to get to know this river and the great, varied country which accompanies it.
  • Fri 5 Sep
  • £195-£295
  • Fri 5 Sep
  • £195-£295
Llanuwchllyn, Gwynedd, UK

The Dee Way 120

This new Ultra distance event urges you to get to know this river and the great, varied country which accompanies it.

  • Enter online
  • GPS tracking
  • Age 18 & over
  • 50 hrs trail running
  • Sat 15 Nov
Bangor, Gwynedd, UK

Slate Trail Ultra | Slate Trail Ultra

  • 145 km trail running + 3900 m ascent
  • Sat 15 Nov
Bangor, Gwynedd, UK

Slate Trail Ultra | Ultra Tour of The Quarries

  • 88 km trail running + 2700 m ascent

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