Cardiff Half Marathon
When4 October 2026
WhereCity-centre start and finish near Cardiff Castle, CF10 3RB Cardiff
TypeSports event
One of the UK's largest and best-supported road races, with a flat, fast 13.1-mile course through the Welsh capital. The route starts and finishes in the city centre near Cardiff Castle and passes landmarks including the Principality Stadium, Cardiff Bay and Roath Park lake. Tens of thousands of runners and spectators take part each autumn.