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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!

August 2026
Aug
22
Sa

Saturn Running - Cwmdare

Trail Run 3 km 5 km ... 50 km 7 hr
September 2026
Sep
12
Sa

Phoenix Running - Trelewis

Backyard Ultra 5 km 11 km ... Marathon 7 hr
Sep
13
Su

Phoenix Running - Deri

5 km 10 km ... Marathon 7 hr
October 2026
Oct
18
Su

Phoenix Running - Aberfan

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

Marathon Eryri

Marathon
November 2026
Nov
7
Sa

Beacons Ultra

Trail Run 13 mi 26 mi 49 mi
December 2026
Dec
6
Su

Sea 2 Summit - Offa's Dyke Half/Full/Ultra

Trail Run Half Marathon Marathon 56 km
Dec
12
Sa

Celtic Trail Races

Trail Run 13 mi 26 mi 34 mi
Dec
20
Su

Saturn Running - Cwmdare

Trail Run 3 km 5 km ... Marathon 50 km