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Hiking trails & Routes

Cefn Onn Quarry – Caerphilly Mountain Summit loop from Caerphilly

Hiking trails & Routes

Cefn Onn Quarry – Caerphilly Mountain Summit loop from Caerphilly

Moderate

Cefn Onn Quarry – Caerphilly Mountain Summit loop from Caerphilly

03:14

11.5km

240m

Hiking

Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels. The starting point of the route is accessible with public transport.

Last updated: April 2, 2026

Waypoints

A

Start point

Bus stop

Get Directions

1

2.67 km

Wern Ddu Clay Pit Nature Reserve

Highlight • Historical Site

Wern Ddu is an SSSI, the quarry workings being around 150 years old and leaving exposed geology that is a little bit older (estimated 300 million years previous).

Tip by

2

3.95 km

Cefn Onn Quarry

Highlight • Structure

Cefn Onn Quarry is a former slate quarry in Cardiff. It is situated next to Coed Tranch-yr-Hebog and Wern Ddu forests. Enjoy some lovely views from here over the surrounding Vale of Glamorgan and nearby towns.

Tip by

3

4.09 km

Coed Tranch-yr-Hebog Quarry

Highlight (Segment) • Structure

Not too difficult - just be careful as you are close to the quarry edge.

Tip by

4

4.76 km

Technical Forest Trail

Highlight (Segment) • Forest

Technical (but fun) trail. Rocky, rooty, and sometimes muddy following rain. Keep alert for your line choice.

Tip by

5

6.84 km

Caerphilly Mountain Snack Bar

Highlight • Cafe

6

7.28 km

Caerphilly Mountain Summit

Highlight • Viewpoint

Great little view point with a nearby cafe and large car park. Top spot.

Tip by

B

11.5 km

End point

Bus stop

Way Types & Surfaces

Way Types

4.03 km

3.22 km

2.02 km

1.45 km

725 m

Surfaces

3.04 km

2.10 km

2.04 km

1.98 km

1.28 km

1.01 km

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Elevation

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

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Weather

Powered by Foreca

Wednesday 1 July

21°C

12°C

0 %

Additional weather tips

Max wind speed: 16.0 km/h

to get more detailed weather forecasts along your route

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