Running in Cardiff

Known in Welsh as Caerdydd, also searched as Cardiff Bay.

A capital city built around a runnable river. The Taff Trail links parkland, the Bay and the hills to the north into one connected network, almost all of it traffic-free.

Cardiff is a capital city with a river running through the middle of it, and almost everything about running here follows from that. The Taff Trail traces the River Taff from the Bay in the south up through the city centre and out into the valleys to the north, giving you flat, mostly traffic-free mileage that starts at your door and ends, eventually, in the hills.

Bute Park and the Taff Trail

Bute Park and the string of green space along the river - Sophia Gardens, Pontcanna Fields, Llandaff Fields - form the heart of the city's running. From here the Taff Trail runs south to the Bay and north through Llandaff, Radyr and beyond, entirely on path away from traffic. It is the run most people in Cardiff default to, for good reason.

Cardiff Bay

South of the castle, the trail reaches the Cardiff Bay barrage, and the loop around the Bay - out along the barrage to Penarth and back via the water's edge - gives you a flat, scenic four or five miles with the sea close by, even though the Bay itself is a freshwater lake now, sealed off from the tide.

Getting some vert

Cardiff is flat, so climbing means heading for the edges. Caerphilly Mountain and the Wenallt, both on the northern fringe above Rhiwbina and Thornhill, give you woodland climbs and, from the top, a clear view back down over the whole city to the Bristol Channel. Neither is large, but they are enough to break up a week of riverside flat running.

Bases nearby: Cardiff · Penarth · Caerphilly · Llandaff

Guides for Cardiff

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Cardiff

Winter running routes around Cardiff

My favourite winter running routes for South Wales & Cardiff including personal experiences, plus the kit that holds up in a Welsh winter.

Cardiff

Cardiff parkruns, reviewed

All six parkruns in and around Cardiff, run and rated - course, PB potential, winter conditions and parking, from someone who has run every one of them.

Cardiff

Five Running Routes from Lisvane

Five real running routes from Lisvane in north Cardiff - a flat reservoir loop, a hilly trail over Caerphilly Mountain, and the Taff Trail run into the city centre.

Races around Cardiff

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10 kmCardiff

Cardiff 10k

A guide to the Cardiff 10k - around 9 m of climbing from the Civic Centre, making it the flattest 10k course in Wales, plus when it runs and what it costs.

Half marathonCardiff

Cardiff Half Marathon

A guide to the Cardiff Half Marathon - the October half from Castle Street, how the ballot works, what a place costs, and when entries open for the next one.

MarathonNewport

Newport Marathon

A guide to the ABP Newport Marathon Festival - the flat April marathon along the Usk, when it runs, what entry costs and how to get in before it sells out.

10KBarry

Barry Island 10K

A guide to the Barry Island 10K: the May seafront race from Whitmore Bay, what it costs and when entries close, plus the Romilly Park climb, Harbour Road parking and traffic from two years running it.

10KPorthcawl

Porthcawl 10k

A course guide to the Brecon Carreg Porthcawl 10K: closed roads, a seafront finish and a second-half drag that stops it being a PB race. Next edition Sunday 27 June 2027.

Runs logged here

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Cardiff

Dragon 50: my first ultra

Second place in 8:23 over 80 km of the Glamorgan coast - going out far too fast, running out of water in the heat, and what an ultra actually asks of you.

Cardiff

Dragon 50 Training Recap - Injury Recovery 2026

A six-week durability-over-fitness rebuild back from a knee injury, ahead of an 80 km ultra - the fuelling plan, the kit list, and the pacing target for the Dragon 50.

Cardiff

Porthcawl 10k race report

A first-person report from the Porthcawl 10k - the figure-of-eight course, the town-centre climb, the wind off the bay, and a 34:00 PB three weeks before an ultra.