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Ring O Fire
A 135-mile ultra circling rugged Welsh coastal cliffs nonstop
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Snowdonia Ultra 100
A 100-mile trek through Snowdonia mountain wilderness
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National 3 Peaks Sea to Summit Ultramarathon Trilogy
Ultramarathon trilogy summiting the highest peaks of Britain
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Snowdonia Sea2Sky
Sea to summit — Barmouth coast into Snowdonia's peaks
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Cardiff 10K
Race past Cardiff Castle and Principality Stadium
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Caernarfon Half Marathon
Flat castle-side half marathon finishing by Caernarfon Castle
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Dragon's Back Race
380km across Wales's mountain spine in six days
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Machlud Trail Race
Sunset trail race skirting the Clwydian Hills
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Abersoch Half Marathon
Winds along the Llyn Peninsula's Irish Sea coast
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Ras Pedol Peris / Peris Horseshoe
Horseshoe ridge race above Llanberis in Snowdonia
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Gower Coastal Trail Races
Coastal trails along Wales rugged Gower Peninsula cliffs and beaches
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Rat Race Sea to Summit - Yr Wyddfa
From sea level to the summit of Snowdon in Wales
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Pembrokeshire Half Marathon & 10K
Country lanes overlooking Milford Haven Waterway
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.