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Marathon Calendar Wales 2025-2026

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Explore the best marathons in Wales for 2025-2026! Our updated list features 27 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

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
January 2026
Jan
10
Sa

The Winter Run to the Castle Ultra

Marathon 42 mi
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
March 2026
Mar
1
Su

Brecon to Cardiff Xtreme

Trail Run Marathon 75 km
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
15
Su

Saturn Running - Cwmdare

Trail Run 3 km 7 km ... Marathon 50 km
April 2026
Apr
5
Su

Pendine Sands Races

Trail Run 5 km 10 km Half Marathon Marathon
Apr
19
Su

Newport Wales Marathon

10 km Half Marathon Marathon
Apr
26
Su

Saturn 7 Hour Time Challenge - Aberdare

3 km 7 km ... Marathon 50 km
Apr
26
Su

Saturn Running - Cwmdare

Trail Run 3 km 7 km ... Marathon 50 km
Apr
26
Su

St David's Day Run

5 km 10 km Half Marathon Marathon
May 2026
May
16
Sa

OTT Marathon

Trail Run 10 mi 26 mi
May
16
Sa

True Grit Trail Half Marathon

Trail Run 26 mi
May
30
Sa

Saturn Running - Cwmdare

Trail Run 3 km 7 km ... Marathon 50 km
June 2026
Jun
6
Sa

Midnight Mountain Marathon

Trail Run Half Marathon Marathon