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Half Marathon Calendar Wales 2025-2026

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Explore the best half marathons in Wales for 2025-2026! Our updated list features 44 exciting races across the region. Find your next race in Wales below and join the running community at these great events!

December 2025
Dec
6
Sa

Secret Santa Tinsel Half Marathon

Trail Run 14 km 10 mi Half Marathon
Dec
6
Sa

Phoenix Running - Aberfan

Backyard Ultra 5 km 10 km ... Marathon 7 hr
Dec
7
Su

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

Trail Run Half Marathon Marathon 33 mi
Dec
7
Su

Phoenix Running - Merthyr Tydfil

5 km 10 km Half Marathon Marathon
Dec
13
Sa

Celtic Trail Races

Trail Run 13 mi 26 mi 34 mi
Dec
20
Sa

Nightmare before Xmas Trail ½ Marathon

Trail Run 13 mi
January 2026
Jan
24
Sa

Saturn Running - Cwmdare

Trail Run 3 km 7 km ... Marathon 50 km
Jan
24
Sa

Saturn Running - Aberdare

Backyard Ultra 3 km 5 km ... Marathon 50 km
Jan
25
Su

Chepstow Running Festival Half Marathon

5 km 10 km Half Marathon
February 2026
Feb
1
Su

The Cardiff Half Marathon Winter Warmer Run

5 km 10 km Half Marathon
March 2026
Mar
1
Su

Jones O Gymru Anglesey Half Marathon

10 km Half Marathon
Mar
1
Su

St David's Day Run

5 km 10 km Half Marathon
Mar
1
Su

City Of Newport Half Marathon

Half Marathon
Mar
1
Su

Saturn Running - Cwmdare

Trail Run 3 km 7 km ... Marathon 50 km
Mar
1
Su

Phoenix Running - Cardiff Bay

5 km 10 km Half Marathon Marathon
Mar
14
Sa

Nant yr Arian Silver Trail

Trail Run 2 mi 3 mi 10 km Half Marathon
Mar
22
Su

Merthyr Half Marathon

Half Marathon
Mar
29
Su

Llandudno Half Marathon

10 mi Half Marathon
April 2026
Apr
5
Su

Pendine Sands Races

Trail Run 5 km 10 km Half Marathon Marathon
Apr
11
Sa

RTT Gower Trail Half Marathon

Trail Run 5 km 10 km Half Marathon