Cardiff Half Marathon 2025 takes place on Sunday, 5th October 2025, offering runners a fast, flat course through the heart of the Welsh capital. The scenic route passes iconic landmarks like Cardiff Castle, the Principality Stadium, and Cardiff Bay, making it one of the UK's most popular running events.

By running for Sport in Mind, you’ll be supporting a leading mental health charity that uses sport and physical activity to transform the lives of people experiencing mental health challenges. Every step you take helps raise awareness and funds for their vital work in communities across the UK.