Races 10K · Cardiff, UK
Cardiff 10K
Cardiff 10K is a flat 10K in Cardiff, UK, held each September. A city-centre loop past Cardiff Castle and the Principality Stadium, over the River Taff to Pontcanna Fields and Sophia Gardens. The organiser calls it flat and fast. It finishes at the Civic Centre. Early September in Cardiff is usually mild and often breezy, with temperatures of 11 to 19°C. On a course as flat as Cardiff 10K, even splits are everything; the classic mistake is banking time in the first third.
Page rebuilt 2026-11-14 · race facts not independently verified — confirm dates and entries on the official race site
When
September
next: Sunday 5 September 2027
Course
flat
10K
Conditions
Early September in Cardiff is usually mild and often breezy, with temperatures of 11 to 19°C.
Racing this course well
A city-centre loop past Cardiff Castle and the Principality Stadium, over the River Taff to Pontcanna Fields and Sophia Gardens. The organiser calls it flat and fast. It finishes at the Civic Centre.
On a course as flat as Cardiff 10K, even splits are everything; the classic mistake is banking time in the first third.
Getting a place
- How you get in
- Open entry: first come, first served
- Entries open
- Entries for the next race were open in November 2026
- Price
- £35 general, £33 for UK club-affiliated runners (2027 race)
Official Cardiff 10K site →Checked November 2026
Race day
- Next race
- Sunday 5 September 2027
- Pacers
- Finish-time pacers in each start wave
- Also on the day
- 2k
The course in numbers
The route crosses the River Taff towards Pontcanna and Llandaff, runs through Pontcanna Fields and past Sophia Gardens, then returns by the castle to the Civic Centre finish.
- Surface
- Closed city roads and park paths
Worth knowing
- First run in 1986.
- Run 4 Wales took over the race in 2023 and revived it.
- The route passes Cardiff Castle twice, near the start and again on the way back.
Pick your goal for Cardiff
Pace charts, weekly structure and timelines for the most common 10K goals:
The date shown is the one the organiser has announced. Change it if yours differs.
Build your training around Cardiff 10K.
RunV works backwards from race day to today. Your plan adapts when life interrupts, and you approve every change. It does not adapt to this specific course — the pacing guidance above is where the course knowledge is.
Everything above stays free and complete — this is an optional next step, not a paywall.
Asked often
- When is the Cardiff 10K?
- The next Cardiff 10K is on Sunday 5 September 2027 in Cardiff, UK. It is held each September.
- Is the Cardiff 10K course flat?
- A city-centre loop past Cardiff Castle and the Principality Stadium, over the River Taff to Pontcanna Fields and Sophia Gardens. The organiser calls it flat and fast. It finishes at the Civic Centre.
- How do I enter the Cardiff 10K?
- Open entry: first come, first served. Entries for the next race were open in November 2026. Price: £35 general, £33 for UK club-affiliated runners (2027 race).
- How should I train for the Cardiff 10K?
- Train specifically for Cardiff — terrain, conditions, goal pace — and let the plan flex around real life. With RunV Premium you can adapt your plan to fit your week.
Not sure what to target? Predict your 10K time from a recent race →
More 10K races
Supplements research for this distance
Build for Cardiff — around your actual life
RunV engineers your block backwards from race day in September — and adapts it when training doesn't go to script. You approve every change.
