Ridge Runners
Cardiff
Ridge Runners is a not-for-profit trail race organiser set up by two Cardiff trail runners, Mark and Elinor. Their races run on the hills and woods around Cardiff and Caerphilly, plus a forest event at Brechfa in Carmarthenshire: Caerphilly 5k and 10k in February, Brechfa half and marathon in March, Radyr half and marathon in May, the Black Cattle point-to-point ultra along the Cambrian Way in August, and Machen half and marathon in November. Expect hilly, varied ground with lots of woodland singletrack and mud. Half marathons and shorter races are marked, but the Machen and Radyr marathons and the Black Cattle ultra need self-navigation, with marshals only at key junctions. Kit checks are strict ('no kit, no entry'), and profits go to local causes chosen by volunteers.
Their races
Pins sit on the start. Open one to see the course.
28
Nov
2026

Machen Trail Races
Machen Welfare Ground, Tyn-y-Waun Road, Machen · Ridge Runners
Winter trail half and marathon over Rudry Common and Machen Mountain
HARD TO VERY HARD
Not open yet
£40–£50
14
Feb
2027

Caerphilly Trail 5k and 10k
Van Community Centre, Clos Guto, Caerphilly · Ridge Runners
Short, hilly marked trail races over Rudry mountain near Caerphilly
MODERATE
Not open yet
£26–£30
13
Mar
2027

Brechfa Trail Races
Keepers Car Park, Brechfa Forest · Ridge Runners
Marked half and marathon on forest tracks in Brechfa Forest
HARD
Not open yet
£40–£50
8
May
2027

Radyr Trail Races
Cardiff Harlequins RFC, Diamond Ground, Forest Farm Road, Whitchurch, Cardiff · Ridge Runners
Half and marathon from Radyr over the Garth and Castell Coch woods
HARD TO VERY HARD
Not open yet
£40–£50
no date
yet

Black Cattle Ultra (Gwartheg Duon)
Llanthony Priory (44 mile) or Abergavenny (33 mile); finish Cardiff Harlequins RFC, Forest Farm Road, Whitchurch, Cardiff CF14 7JN · Ridge Runners
44 or 33 mile point-to-point ultra along the Cambrian Way to Cardiff