The Cardiff Half Marathon 2027 is not the sort of event that tiptoes into Cardiff. It arrives with intent. Thousands of runners, large spectator crowds and a city-centre route mean this is one of those Sundays when the Welsh capital has to bend around the race rather than the other way round.
And the key detail is simple: the main race starts in Castle Street at 10am on Sunday, October 4, while the elite wheelchair race gets underway slightly earlier at 9.57am. That staggered schedule is not an afterthought. It is part of how the event manages a huge flow of runners and keeps the city moving as safely as possible.
What time does Cardiff Half Marathon 2027 start?
The headline time is 10am. That is when the Cardiff Half Marathon begins in Castle Street on Sunday, October 4. For anyone planning to watch, race, or simply get around Cardiff that morning, that is the moment the city starts to change shape.
The elite wheelchair race begins at 9.57am, just before the main field. That slight gap matters because the event is built around control as much as competition. With so many runners on the course, small scheduling decisions help reduce congestion and keep the race flowing.
What is the Cardiff route?
The course runs past several Cardiff landmarks and through Cardiff Bay before ending in the city centre. That is exactly why the race draws such a big crowd: it is not confined to one stretch of road, but threads through the most recognisable parts of the city.
Along the way, the race passes places such as Cardiff Castle, the Senedd, the Wales Millennium Centre, the Norwegian Church, Roath Park Lake, Penarth Marina and both the Principality Stadium and Cardiff City Stadium. It is a route that gives the event its character as well as its scale.
This is not just a run. It is a citywide stage, with Cardiff itself becoming part of the spectacle.
When does it finish?
The race is likely to finish at 2pm or shortly afterwards, with a four-hour cut-off time in place. That cut-off is there for a reason: it helps the event manage the course, protect the runners and allow roads to reopen safely once the bulk of the field has passed through.
So if the start is the signal that the day has begun, the finish is the point when Cardiff can start to breathe again. Until then, the city is all in.
