The park was originally a private estate owned by Thomas Prosser before being acquired by Cardiff Corporation in 1946.
It is a registered Grade II site on the Cadw/ICOMOS Register of Parks and Gardens of Special Historic Interest in Wales.
The valley stream feeds a series of ornamental ponds that act as focal points along the primary pathways.
The park’s elevation provides a natural microclimate that supports mature specimens of Himalayan cedar and Western hemlock.
It connects directly to the Cefn Onn woodland trail, leading hikers toward the ridgelines of the Garth mountain range.
Parc Cefn Onn is a 17-acre Grade II listed woodland park situated on the northern edge of Cardiff. Originally created by businessman Thomas Prosser in the early 20th century, the park features a landscape of exotic trees, streams, and woodland walks. The park is managed by Cardiff Council and is known for its collection of rare rhododendrons, azaleas, and Japanese maples. It serves as an accessible gateway to the lower slopes of Caerphilly Mountain. The layout emphasizes the natural topography, utilizing the deep valley and the stream that runs through its center. It is a designated Site of Importance for Nature Conservation (SINC) due to its diverse habitats. The park provides a quiet, sheltered environment distinct from the city center's urban landscape.
The wooden bridge crossing the stream in the lower valley offers the most iconic perspective of the woodland canopy.
Wear waterproof footwear as the valley floor paths can become muddy and slick after rainfall.
Follow the circular 'Dingle' path to see the most varied botanical collections.
Bring a picnic, as the designated lawn areas near the entrance are popular for quiet breaks.
Do not attempt to hike to the top of Caerphilly Mountain in street shoes or casual footwear, as the terrain becomes steep and uneven outside the park boundaries.
Dogs must be kept under control, and visitors are expected to follow 'Leave No Trace' principles to protect the SINC habitat.
