Caernarfon
Trail Running Calendar near Caernarfon 2026-2027
Explore the top trail runs near Caernarfon for 2026-2027! We've gathered 34 exciting trail runs in the area. Check out our detailed list below to find your next local trail run.
July 2027
Trail races in Eryri from 10K to ultra start and finish in Llanberis, with mountain routes, on course support, an event village and a kids fun run supporting local rescue.
A 15.35 km mountain race on 17 July 2027 with 994 m of ascent; entrants must be over 18 and have mountain running experience.
Mountain races in Eryri's Ogwen Valley offering 40K, 25K and 15K routes from Plas y Brenin with marked trails, on course support and chip timing.
August 2027
A Backyard Ultra on the Llŷn Peninsula in August 2027 where runners complete an hourly loop until they stop; entry includes support, refreshments, a medal and free camping.
September 2027
A 45-mile mountain ultramarathon across Snowdonia, following high trails over Tryfan and Yr Wyddfa with five checkpoints and required mountain kit.
Six-day mountain event from Conwy to Cardiff, featuring The Dragon at 380 km and 16,400 m ascent, plus two-day Fire and Tail options.
A 24 hour multi-lap endurance race on a 5 km coastal trail at Abersoch, with solo and two-person relay options and on-site support.
A fully waymarked, fully supported sea to summit ultramarathon from Caernarfon Castle to Rhyd Ddu covering 29 miles and about 5600 ft of ascent.
October 2027
November 2027
A 60 km winter coastal loop on the Llŷn Peninsula starting and finishing at Tafarn Y Fic, offered as an individual ultra or a team of four relay with checkpoints and support.