Running races in Gwynedd, Wales
Find your next race in Gwynedd, Wales. AthRecs lists 8 events with upcoming dates here. Open a race guide for the location, listed distances and entry information where available.
Upcoming running events include 10K races, 25K races, 5K races, half marathons and marathons.
Events to explore include Marathon Eryri, Slate Trail Ultra & Ultra Tour of the Quarries and Dydd Gŵyl Dewi Half Marathon 2027.
26 listed events · 8 with upcoming dates
Upcoming races
Marathon Eryri
WALLlanberis, Gwynedd
Marathon Eryri — Llanberis, Gwynedd, Wales.
· Marathon
Race details, entry and past editions →Slate Trail Ultra & Ultra Tour of the Quarries
WALBangor, Gwynedd
Long mountain trail routes around the slate landscapes of Eryri.
· 147K · Status TBC
Race details, entry and past editions →Dydd Gŵyl Dewi Half Marathon 2027
WALAberdaron, Gwynedd
Dydd Gŵyl Dewi Half Marathon 2027 — an officially published half-marathon fixture at Llŷn Peninsula from Tudweiliog to Aberdaron.
· Half
Race details, entry and past editions →Race for Life Caernarfon 5K 2027
WALCaernarfon, Gwynedd
Race for Life Caernarfon 5K 2027 — an officially confirmed in-person 5K at Parc Coed Helen.
· 5K
Race details, entry and past editions →Eryri by UTMB®
WALLlanberis, Gwynedd
Eryri by UTMB® — an official UTMB World Series Event.
· 163K
Race details, entry and past editions →Ultra Wales 50
WALGanllwyd, Gwynedd
Ultra Wales 50 in Ganllwyd.
· 51mi
Race details, entry and past editions →Snowdonia Trail Marathon Eryri
WALLlanberis, Gwynedd
Snowdonia Trail Marathon Eryri in Llanberis.
· 9.8K
Race details, entry and past editions →Race the Train Tywyn
WALTywyn, Gwynedd
Race the Train Tywyn in Tywyn.
· 10K · Status TBC
Race details, entry and past editions →Planning your next race
Which running races are coming up in Gwynedd, Wales?
Marathon Eryri is listed for 24 October 2026. Slate Trail Ultra & Ultra Tour of the Quarries is listed for 14 November 2026 (status to be confirmed). Dydd Gŵyl Dewi Half Marathon 2027 is listed for 28 February 2027. Check the race guide and organiser’s latest information before making plans.
What running distances are listed in Gwynedd, Wales?
Look for 10K races, 25K races, 5K races, half marathons and marathons in the upcoming listings. If an event offers several distances, check the individual race guide to choose the edition and distance you want to enter.
Where can I find race entry details for Gwynedd, Wales?
Follow the link from the race guide to the organiser or entry provider, where one is available. Check the entry deadline, eligibility and current availability there. A listed race date does not necessarily mean entries are still open.
Why has a race moved out of the upcoming calendar?
Once its listed dates have passed, a race moves to the past-editions view unless another upcoming edition is recorded. Cancelled events also leave the upcoming list. The race guide stays available, and the event returns when a new date is added.