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Marathon Calendar near Merthyr Tydfil 2025-2026

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Explore the top marathons near Merthyr Tydfil for 2025-2026! We've gathered 20 exciting races in the area. Check out our detailed list below to find your next local race.

December 2025
Dec
6
Sa

Phoenix Running - Aberfan

Backyard Ultra 5 km 10 km ... Marathon 7 hr
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
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
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
July 2026
Jul
25
Sa

Saturn 7 Hour Time Challenge - Aberdare

3 km 7 km ... Marathon 50 km
Jul
25
Sa

Saturn Running - Cwmdare

Trail Run 3 km 7 km ... Marathon 50 km
October 2026
Oct
18
Su

Phoenix Running - Aberfan

Backyard Ultra 3 mi 10 km Half Marathon Marathon