Now!
Sunday 6 September 2026
The CDF 10K is an iconic and historic event, celebrating its 40th anniversary in 2026. The atmosphere is electric and the course journeys through the heart of the Welsh capital, taking in all of the highlights including Cardiff Castle and the Principality Stadium.
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Registered Runners
Year History
Kilometre Race
Organised by Run 4 Wales (R4W)
The CDF 10K is operated by R4W, a not-for-profit social enterprise that works in partnership with London Marathon Events (LME).
Its portfolio of major sporting events includes the iconic Cardiff Half Marathon, ABP Newport Marathon Festival, Porthcawl 10K, Barry Island 10K and more.
Check out a full calendar of events, and find your next challenge!
Run for Lead Charity Kidney Wales!
Run for #TeamKW and help raise vital funds for those living with chronic kidney disease in Wales.
Those opting to raise money for Kidney Wales can enter for just £5, when pledging to raise £125.
News
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Entries now open for the 2026 R4W 10K Series
Entries are now open for the 2026 Run 4 Wales 10K Series for keen runners looking to complete the set
Lab 22 team win Scimitar Business Challenge
A team from Lab 22 have claimed the top spot in the 2025 Scimitar Business Challenge at the Brecon Carreg
Largest ever Brecon Carreg CDF 10K takes to the streets of Cardiff
It was the biggest ever Brecon Carreg CDF 10K event, with thousands of runners and spectators taking over the Welsh
2025 Elite Race Preview
Omar Ahmed will look to seal a second consecutive R4W 10K Series victory on Sunday. Olivia Tsim is the fastest
2025 Brecon Carreg CDF 10K: Everything You Need To Know
The 39th Brecon Carreg CDF 10K is returning to the Welsh capital on Sunday 7 September 2025. This year will
Man to take on Brecon Carreg CDF 10K in wetsuit in memory of best friend
A father-of-four from Caerphilly will be donning his wetsuit to run the Brecon Carreg CDF 10K in memory of his
ROUTE
ROUTE
The CDF 10K takes runners on a sightseeing tour of the city, with highlights including Cardiff Castle and the Principality Stadium. The race journeys through the heart of central Cardiff, before crossing the River Taff and heading towards the leafy suburb of Pontcanna and the grade 2 listed parkland of Llandaff and Pontcanna Fields. Runners will then pass Sophia Gardens, the home of Welsh cricket, before a grandstand finish in the Edwardian Civic Centre.
GALLERY
GALLERY
BUSINESS CHALLENGE
The Scimitar Business Challenge is a fantastic opportunity for teams to compete to win prizes whilst taking advantage of additional event experience benefits.
UP TO
40
CHALLENGE TEAMS
UP TO
300
CHALLENGE RUNNERS
PARTNERS
