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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 38 exciting races across the region. Find your next race in Wales below and join the running community at these great events!

April 2025
Apr
13
Sunday

The Pendine Sands Races

Trail Run 5 km 10 km 13 mi 26 mi
Apr
13
Sunday

Summit 2 Sea - The Offa's Dyke Half Marathon

Trail Run 13 mi
Apr
13
Sunday

Newport Wales Marathon

10 km 13 mi 26 mi
Apr
26
Saturday

Endurancelife | Pembrokeshire

Trail Run 10 km 13 mi 26 mi 34 mi
May 2025
May
10
Saturday

Cadair X

Trail Run 13 mi
May
10
Saturday

Afan Chase Trail Races

Trail Run 10 km 13 mi
May
11
Sunday

Snowdonia Half Marathon

13 mi
May
31
Saturday

Saturn Running - Aberdare

Backyard Ultra 5 km 7 km ... 26 mi 50 km
June 2025
Jun
7
Saturday

Conquer Cardiff Summer 5k 10k and Half Marathon

5 km 10 km 13 mi
Jun
7
Saturday

Midnight Mountain Marathon

Trail Run 13 mi 26 mi
Jun
8
Sunday

Swansea Half Marathon

13 mi
Jun
14
Saturday

Black Mountains 50

Trail Run 13 mi 26 mi 32 mi 50 mi
Jun
14
Saturday

Limitless Trails - Black Mountains

Trail Run 13 mi 26 mi 50 km 80 km
Jun
14
Saturday

True Grit Trail Half Marathon

Trail Run 13 mi
July 2025
Jul
12
Saturday

Xterra Snowdonia Trail Marathon Eryri

Trail Run 10 km 13 mi 26 mi 57 km
Jul
19
Saturday

Saturn Running - Aberdare

Backyard Ultra 5 km 7 km ... 26 mi 50 km
Jul
27
Sunday

Pen Y Fan Challenge

Trail Run 5 mi 13 mi
September 2025
Sep
7
Sunday

Caernarfon Half Marathon

13 mi
Sep
20
Saturday

Abersoch Half Marathon

Trail Run Road Race 13 mi
Sep
21
Sunday

Pumsaint Trail Half Marathon

Trail Run 10 km 21 km
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