Course
Key dates
- ✓Entries openedSat 17 Oct 2026
- ★Race daySun 17 Oct 2027
About
The Great Welsh Marathon and Half Marathon is South Wales' oldest and most beloved running event, taking place in the stunning Carmarthenshire countryside. Runners of all levels can challenge themselves on the scenic, rolling course, with the option to tackle the full marathon or the half marathon distance. This is a must-do event for any runner seeking an unforgettable experience in the heart of the Welsh countryside.
Save Great Welsh Marathon and Half Marathon to your season and RunCalendar reminds you the morning entries open and before they close. Free on iPhone, no account needed.
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Abergele 5K & 10K
Runs the coastal promenade between Abergele and Pensarn
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Ron Skilton Half Marathon
Runs from Llanwrtyd Wells, Britain's smallest town
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The Severn Challenge
Britain's longest riverside path, from source toward sea
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Mtc Cerridwen
Day two of Wales end-to-end, Caernarfon to Barmouth
A confirmed date shows its day; a provisional one shows only its month, because we won't claim a day we don't have. This page is rebuilt every night from the RunCalendar catalogue.