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

July 2026
Jul
25
Saturday

Saturn 7 Hour Time Challenge - Aberdare

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

Saturn Running - Aberdare

Backyard Ultra 3 km 7 km ... Marathon 50 km
August 2026
Aug
15
Saturday

Run to the Castle Ultra

26 mi 42 mi
December 2026
Dec
19
Saturday

Nightmare before Xmas Trail ½ Marathon

Trail Run Marathon
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