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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!

July 2026
Jul
8-12
We - Su

Severn Challenge

Trail Run 26 mi 30 mi ... 57 mi 59 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 7 km ... Marathon 50 km
August 2026
Aug
15
Sa

Run to the Castle Ultra

26 mi 42 mi
October 2026
Oct
18
Su

Phoenix Running - Aberfan

Backyard Ultra 5 km 10 km Half Marathon Marathon
Oct
24
Sa

Marathon Eryri

Marathon