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Trail Running Calendar Wales 2025-2026

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Explore the best trail runs in Wales for 2025-2026! Our updated list features 117 exciting races across the region. Find your next race in Wales below and join the running community at these great events!

December 2025
Dec
7
Su

Sea 2 Summit - Offa's Dyke Half/Full/Ultra

Trail Run Half Marathon Marathon 33 mi
Dec
12
Fr

Trail by Torchlight

Trail Run 8 km
Dec
12
Fr

Brecons Fell-Running, Trail and Yoga Camp

Trail Run 10 mi 15 mi
Dec
13
Sa

Celtic Trail Races

Trail Run 13 mi 26 mi 34 mi
Dec
13
Sa

The Night Nobbler

Trail Run 10 km
Dec
20
Sa

Nightmare before Xmas Trail ½ Marathon

Trail Run 13 mi
Dec
20
Sa

Moel Famau Festive 'Piece of String' Race

Trail Run 12 km
Dec
20
Sa

Saturn Running - Cwmdare

Trail Run 3 km 5 km
January 2026
Jan
10
Sa

Reservoir Roundabout

Trail Run 12 mi 20 mi
Jan
18
Su

Cardiff Trail 10k

Trail Run 10 km
Jan
18
Su

Guided Trail Run - Eyarth Rocks and Graig Wyllt

Trail Run 12 km
Jan
18
Su

CF64 Winter Race

Trail Run 6 mi
Jan
18
Su

West Glamorgan XC League - Margam Park

Trail Run 5 mi
Jan
24
Sa

Tour De Yr Wyddfa

Trail Run 44 km
Jan
24
Sa

Saturn Running - Cwmdare

Trail Run 3 km 7 km ... Marathon 50 km
Jan
31
Sa

Tarrenhendre Fell Race

Trail Run 6 mi
February 2026
Feb
1
Su

West Glamorgan XC League - Kenfig Nature Reserve

Trail Run 4 mi
Feb
22
Su

Sorbrook Slog

Trail Run 7 mi
Feb
28
Sa

Castle2Castle #Ultra

Trail Run 32 mi
March 2026
Mar
1
Su

Brecon to Cardiff Classic

Trail Run 70 km