Trail Running Calendar Wales 2025-2026

Serious Santa trail races serve up rugged, scenic runs in the Black Mountains from Cwmdu Village Hall with Half Marathon, Ten Mile and 14 km options. Expect technical trails, festive vibes and handmade finisher trophies.

Hit the Alyn Waters Winter Trails on 6 December 2025 for scenic 5 km and 10 km chip timed trail races, plus a 5 km canicross and a free children's 1 km dash. Friendly, accessible courses with medals for all and marshals throughout.

Sea 2 Summit on 7 December 2025 sets off from Prestatyn seafront along the stunning Offa's Dyke National Trail with half, full and 33 mile ultra options. Expect rugged winter trails, summit finishes and required safety kit; coach return is..

Experience a winter trail and fell race by torchlight in Llangollen this December from Dinas Bran Leisure Centre. The 8 km route includes about 244 m of ascent, a sharp climb up Velvet Hill and faster downhill sections; head torch required.

Recharge in the Black Mountains with a weekend of guided trail runs, morning yoga and inspiring talks. Stay at the atmospheric Dinas Castle bunkhouse with cooked breakfasts and stunning views.

Tackle the rugged Celtic Trail in South Wales, running through Afan Forest and the Rhigos with steep climbs, river crossings and sweeping views toward the Brecon Beacons. Choose Ultra, Marathon or Half distances to test your trail legs.

The Night Nobbler is a 10 km night trail through the woods near Narberth, Wales, returning on 13 December 2025 with a playful RERUN theme. Expect muddy single track, stream crossings and lit sections; bring a torch and join the upcycled fan..

Join the A Nightmare Before Xmas Trail Half Marathon on 20 December 2025 in Bridgend, South Wales. Tackle scenic mixed terrain, muddy forestry trails and climbs, then celebrate with mulled wine, a bespoke medal and a prize for best Christma..

Run Moel Famau's festive Piece of String at Bwlch Penbarras on 20 Dec 2025, a surprise 6 to 12 km trail where the exact route is only revealed near the end. Finishers enjoy a mince pie and festive medal and a canicross race runs before the..

Get into the festive spirit at Santa Run Wales in Dare Valley Country Park, Aberdare, a family friendly fun run with optional fancy dress, Christmas music and mince pies. Every finisher earns a festive medal and goody bag.

Reservoir Roundabout on 10 January 2026 at Elan Valley Visitor Centre offers scenic but challenging upland walks and runs with 20 mile and 12 mile route options. Routes are partly waymarked so map reading and proper kit are required; this n..

Discover the new Cardiff Trail 10k, a scenic 10 km trail run through Fforest fawr near Castell Coch. Expect muddy singletrack, sweeping views and a friendly atmosphere perfect for trail runners looking for a January adventure.

Join a guided 12 km trail run from the village of Pwll Glas exploring Eyarth Rocks and Graig Wyllt, with gentle hills and varied terrain. Enjoy planned stops, scenic views and friendly company on this relaxed outdoor adventure.

Take on the CF64 Winter Race at Cosmeston Lakes Country Park, a scenic 6.4 mile trail through woodland, meadows and marshland on 18 Jan 2026. Enjoy an undulating off road route, marshals, free photos and a friendly trail atmosphere.

Take on the third West Glamorgan cross country race at Margam Park on 18 January 2026, a scenic but testing 5 mile course hosted by Run4All Neath. Pre registration opens 1 January and no on the day entries will be accepted.

Tour De Yr Wyddfa is an epic winter loop around Yr Wyddfa, climbing 2327 m on the full 43.5 km route. Solo, pair or two leg relay entries are welcome, but runners must meet mountain experience and kit requirements for safety.

Take on Spice Up Your Run Wales, a relaxed 7 hour time challenge at scenic Dare Valley Country Park where you pick your distance from 3 km upwards. Enjoy countryside laps, snacks and medals for finishers, with fancy dress warmly encouraged.

Take on the Ras Tarrenhendre Fell Race in Abergynolwyn, Wales on 31 January 2026, a rugged 6 mile course climbing to Tarrenhendre summit with 2000 ft of ascent. Enjoy tough trails, dramatic views and homemade soup back at HQ.

Take on Round 4 of the West Glamorgan XC League at Kenfig Nature Reserve on 1 February 2026, a scenic 4.2 mile cross country hosted by Cornelly Striders. Entries are capped so book in advance to guarantee your place.

Take on the Sorbrook Slog on 22 February 2026, a lively 7 mile multi terrain race through footpaths, fields and gullies around Sorbrook and Sluvad in Cwmbran. Enjoy marshals on course, post race tea and cake and a finishers goodie bag.