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

November 2025
Nov
15
Saturday

Margam Trail Races

Trail Run 5 km 10 km 21 km
Nov
16
Sunday

Conwy Half Marathon

13 mi
Nov
16
Sunday

Cardiff Trail Half Marathon

Trail Run 13 mi
Nov
29
Saturday

Loggerheads Half Marathon

Trail Run 21 km
December 2025
Dec
6
Saturday

Secret Santa Tinsel Half Marathon

Trail Run 14 km 10 mi 13 mi
Dec
7
Sunday

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

Trail Run 13 mi 26 mi 33 mi
Dec
13
Saturday

Celtic Trail Races

Trail Run 13 mi 26 mi 34 mi
Dec
20
Saturday

Nightmare before Xmas Trail ½ Marathon

Trail Run 13 mi
Dec
21
Sunday

Saturn Running - Aberdare

Backyard Ultra 5 km 4 mi ... 26 mi 50 km
March 2026
Mar
1
Sunday

Jones O Gymru Anglesey Half Marathon

10 km 13 mi
Mar
1
Sunday

Saturn Running - Aberdare

Backyard Ultra 5 km 7 km ... 26 mi 50 km
Mar
14
Saturday

Nant yr Arian Silver Trail

Trail Run 2 mi 10 km 21 km
Mar
22
Sunday

Merthyr Half Marathon

13 mi
April 2026
Apr
5
Sunday

Pendine Sands Races

Trail Run 5 km 10 km 13 mi 26 mi
Apr
12
Sunday

Summit 2 Sea - The Offa's Dyke Half Marathon

Trail Run 13 mi
Apr
19
Sunday

Newport Wales Marathon

10 km 13 mi 26 mi
Apr
25
Saturday

Endurancelife | Pembrokeshire

Trail Run 10 km 13 mi 26 mi 34 mi
May 2026
May
10
Sunday

Snowdonia Half Marathon

13 mi
September 2026
Sep
13
Sunday

Lake Vyrnwy Half Marathon

13 mi
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