Trail Running Calendar Wales 2025-2026

Run the A Nightmare Before Xmas Trail half marathon on 20 December for a festive, challenging trail with mixed terrain and a steep Hill of Doom finish. Enjoy seasonal treats, a finisher medal and a prize for best Christmas fancy dress.

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.

Castle 2 Castle Ultra is a sold out 32 miles run from Powis Estate in Welshpool to Caffi Wylfa in Chirk, blending fast flat paths, rolling footpaths and open views. Prizes await top finishers and everyone gets a finisher plate and goodies.

Run the scenic Brecon to Cardiff Ultra, a fully marked 70 km one way race along the Taff Trail on 1 March 2026. Enjoy epic views, checkpoint support and a finishers medal as you cross the line at Coleg y Cymoedd in Nantgarw.

Take on the Brecon to Cardiff Xtreme, a winter mountain trail offering a challenging 75 km ultra or a 26.2 mile marathon across rugged ridges. Navigation, big climbs and stunning upland views make this a true mountain test.

Join the St David's Day Dragon Run at Dare Valley on 1 March 2026, a relaxed seven hour challenge where you choose how many laps to run. Expect scenic trails, medals from 3 km and tasty goody bags with vegan options.

Hit the trails at Loggerheads Country Park with 5 km, 10 km and Canicross routes over riverside paths, rocky sections and a set of steps to conquer. Organised event with on site facilities and great reviews.

Tackle a scenic but testing 6.8 km fell course around Dolgarrog with 417 m of climb, hosted at Canolfan Porthlwyd. Entry on the day; minimum age 16 makes it perfect for adventurous runners.

Join the Nant Yr Arian Silver Trail Races on 14 March 2026 in the scenic Cambrian Mountains, featuring a trail Half Marathon, 10 km and fun youth races for all ages. Organized by Aberystwyth Athletic Club, the community event supports local..