Cardiff Half Marathon 2026

The Cardiff Half Marathon is a road race through Wales’ capital, run each year with a sell-out field of about 27,500 runners. It started in 2003 with 1,500 runners and is now the UK’s second largest half marathon, as well as Wales’ biggest mass-participation and multi-charity fundraising event. The course is flat and fast, passing Cardiff Castle, the Principality Stadium, the Civic Centre and Cardiff Bay. The field stretches from first-timers and charity fundraisers to club runners and world-class athletes, with separate elite races for men, women and wheelchair racers. Crowds line the route in large numbers, and the race also sits in the SuperHalfs series alongside Lisbon, Prague, Berlin, Copenhagen and Valencia.