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Marathon Calendar Wales 2026-2027

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Monthly updates for Wales

Get new running races (and updates) in your inbox every month.

Explore the best marathons in Wales for 2026-2027! Our updated list features 29 exciting races across the region. Find your next race in Wales below and join the running community at these great events!

March 2026
Mar
1
Su

Brecon to Cardiff Xtreme

Trail Run Marathon 75 km
Mar
1
Su

Saturn Running - Cwmdare

Trail Run 3 km 5 km ... 50 km 7 hr
Mar
15
Su

Saturn Running - Cwmdare

Trail Run 3 km 5 km ... Marathon 50 km
Mar
29
Su

Phoenix Running - Trelewis

Backyard Ultra 5 km 10 km Half Marathon Marathon
April 2026
Apr
5
Su

Pendine Sands Races

Trail Run 5 km 11 km ... Marathon 53 km
Apr
19
Su

Newport Wales Marathon

10 km Half Marathon Marathon
Apr
25
Sa

Phoenix Running - Trelewis

Backyard Ultra 5 km 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 5 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 5 km ... 50 km 7 hr
May
30
Sa

Phoenix Running - Trelewis

Backyard Ultra 5 km 10 km ... Marathon 7 hr
June 2026
Jun
6
Sa

Midnight Mountain Marathon

Trail Run 13 mi 26 mi
July 2026
Jul
8-12
We - Su

Severn Challenge

Trail Run 26 mi 30 mi ... 59 mi 220 mi
Jul
18-19
Sa - Su

Gower Peninsula Ultra Challenge

Trail Run 10 km 25 km ... 75 km 100 km
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 5 km ... 50 km 7 hr
August 2026
Aug
15
Sa

Run to the Castle Ultra

Marathon 42 mi