Running races in Gwynedd, Wales
Find running races in Gwynedd, Wales. Compare 8 upcoming events by date and location. Open a race guide for the course, recorded editions and official 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 running races
8 matching events, earliest date first. Entry availability is shown separately.
Marathon Eryri
WALLlanberis, Gwynedd
Marathon Eryri — Llanberis, Gwynedd, Wales.
· Marathon
Race details, entry and past editions →Entry information ↗Slate Trail Ultra & Ultra Tour of the Quarries
WALBangor, Gwynedd
Long mountain trail routes around the slate landscapes of Eryri.
· 147K / 80K · 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 marathon
Race details, entry and past editions →Entry information ↗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 →Entry information ↗Eryri by UTMB®
WALLlanberis, Gwynedd
Eryri by UTMB® — an official UTMB World Series Event.
· 163K / 78K
Race details, entry and past editions →Entry information ↗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 / 14mi / 3.3mi / 5.5mi · Status TBC
Race details, entry and past editions →Race archive
Past races and previous editions
Looking back at a race? Browse the guides below for recorded editions. This section also includes events awaiting a new date and cancelled editions. Previous editions of races in the upcoming calendar are available through their race guides above.
Bangor City 10K & Half Marathon
WALBangor, Gwynedd
Bangor City 10K & Half Marathon — coastal city races forming part of the Four Castles Series.
Next date not listed
Race guide and recorded editions →Pedol Peris 2026
WALLlanberis, Gwynedd
Pedol Peris 2026 — an officially published 17.5mi race at Padarn Lake Hotel.
Next date not listed
Race guide and recorded editions →Pen LLyn Ultras Summer Editions — PLU 50
WALAbererch, Gwynedd
Historical results collected from the UTMB Index.
Next date not listed
Race guide and recorded editions →RunThrough Snowdonia Sea2Sky
WALBarmouth, Gwynedd
RunThrough Snowdonia Sea2Sky in Barmouth.
Next date not listed
Race guide and recorded editions →RunThrough Trails Snowdonia Sea2Sky — SNOWDONIA SEA2SKY 53K
WALBarmouth, Gwynedd
Historical results collected from the UTMB Index.
Next date not listed
Race guide and recorded editions →SkyRun Eryri® — COPPER SKYTRAIL™
WALRhyd-Ddu, Gwynedd
Historical results collected from the UTMB Index.
Next date not listed
Race guide and recorded editions →Choosing a race in Gwynedd
The unfiltered upcoming calendar includes events in Llanberis (3), Aberdaron (1), Bangor (1). Use the town filter to compare locations, then check the race guide for the start venue and organiser’s travel information.
Questions about running races in Gwynedd
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.