Wales
Trail Running Calendar Wales 2026-2027
Explore the best trail runs in Wales for 2026-2027! Our updated list features 210 exciting trail runs across the region. Find your next trail run in Wales below and join the trail community at these great events!
November 2026
Two long distance trail races on the Snowdonia Slate Trail that pass slate heritage sites, include aid stations, GPS tracking and strict mountain safety requirements.
Fully marked trail races at Margam Park including a half marathon and a 10k, running through woodland, parkland and the deer park with coastal views; entries include parking, timing, a medal and download photos.
Trail Half Marathon Wales at Margam Country Park on 14 November 2026 features fully marked forest races over 21.1 km and 10.2 km with checkpoints and included parking.
A guided 55 km linear run across Anglesey with over 2000 m of ascent, five supported sections, and entry options including a member rate.
A 16.1 km fell race around Penmaenmawr with 594 m ascent, partial route marking and an early start option for slower runners; entry is online only (£12).
A 7 hour time challenge at Dare Valley Country Park with flexible lap distances from 3 km to 50 km, themed medals, distance pins, goody bags and aid stations.
Community Santa run at Montgomery School with 1 and 3 mile routes, optional Christmas dress, on-site refreshments and free parking; children under 14 must be accompanied.
A trail half marathon at Loggerheads Country Park with solo and teams of three relay options, varied terrain and feed stations each 7 km lap.
A 5.7 km fell race in Llanfoist with 485 m ascent, limited to 120 runners; entry fees £6/£4 and no entries on the day.
Two trail distances on 28 November 2026 around Machen, featuring wooded single track, ridgeway exposure and steep climbs. The half course is fully marked while the marathon requires self navigation with marshals at key points.
Lap-based timed event at Parc Taf Bargoed on 28 November 2026 offering flexible distances from a 5.3 km lap up to ultra, with medal and no medal entry options.
A fully marked 10km night trail run near Narberth with light installations, a LIGHT fancy dress theme, mandatory torch and mobile phone, and prizes for best costumes.
Final race of the 2026 RTT Series in Afan Forest offering 5 km and 10 km trail routes with chip timing, medals and water stations at Bryn Bettws Lodge.
A club organised race at Blaenwern Holiday Centre in Llanybydder on 29 November 2026 covering 6.5 miles on mixed surfaces; junior and senior categories are included and past results are archived online.
A guided 10 km trail run from the Sychnant Pass summit featuring runnable terrain, regular stops and a steady group pace on an upland route.
December 2026
Fell race on 4 December 2026 at Llandegla Forest covering 6.4 km with 229 m climb; Category BS, partially marked course and compulsory headtorch, minimum age 16.
Winter trail races at Alyn Waters offering fully marked 5k and 10k courses with chip timing, medals for finishers and a free 1km children's dash.
Night orienteering on Mumbles Hill near Swansea, part of the SBOC WOA club league; family friendly and suitable for newcomers with coaching available.
Trail races from Prestatyn seafront along Offa's Dyke offering half, full and a 55.5 km ultra finishing at Horseshoe Pass.