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Anglesey Trail Half Marathon & 10K
Woodland trails past Llanddwyn Island toward Snowdonia views
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Cardiff 1 5k 5k 10k Half Marathon Morun
A Movember run through Cardiff's Bute Park
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EnduranceLife Gower
Cliff top trails across Britains first protected coastal landscape
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Coast2Coast Winter Ultra
Crosses the Llŷn Peninsula, coast to coast
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EnduranceLife Or Gower
Cliff top trails across Britains first protected coastal landscape
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Off The Tarmac Ultra Marathon
30-mile ultra through the Brecon Beacons
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Beacons Ultra, Marathon & Half Marathon
Ultra and marathon trails through the wild Brecon Beacons peaks
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Dirt Half Marathon
Towpaths and the Greensand Ridge near Leighton Buzzard
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Afan Forest Trail Half Marathon & 10K
Trail race through Afan Forest Park's valleys
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Slate Trail Ultra
Conquer Snowdonia slate quarries on an epic ultra trail
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Conwy Half Marathon
Race the Welsh coast beneath Conwy Castle and Snowdonia
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Machen Trail Races
Trail marathon and half over the Caerphilly hills
Save any of these to your season in RunCalendar and hear the morning entries open. Free on iPhone, no account needed.
Every race here is published by its organiser; RunCalendar checks the date and the entry window against the organiser's own page and rebuilds this calendar every night. A confirmed date shows its day; a provisional one shows only its month. Last updated 22 October 2026.