Caernarfon Castle – Pen-y-Pass loop from Porthmadog

Mountain biking trails

Caernarfon Castle – Pen-y-Pass loop from Porthmadog

Moderate

riders

Caernarfon Castle – Pen-y-Pass loop from Porthmadog

04:56

80.3km

870m

Mountain biking

Moderate mountain bike ride. Good fitness required. Suitable for all skill levels. The starting point of the route is accessible with public transport.

Last updated: August 21, 2026

Tips

Includes a segment in which cycling is not permitted

After 68.6 km for 61 m

Waypoints

Start point

Train Station

Get Directions

4.45 km

Caernarfon Castle

Highlight • Castle

A medieval fortress situated on the on the banks of the River Seiont, Caernarfon Castle has protected Caernarfon since the 11th century. The magnificent castle is open to visitors from …

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41.4 km

Snowdon Inn Campsite

Highlight • Rest Area

Pretty, spacious campsite located by the river. The highlight is certainly the refreshing morning swim in the “pool” by the river.
The street calms down even at night.

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46.3 km

View of Llyn Peris and Dinorwig Quarry

Highlight • Viewpoint

Excellent sight looking across Llyn Peris which is 503mtrs above sea level. Dinorwig hydroelectric power station is straight across the lake, this generates 1728MW of power. There are 16 kilometres …

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51.4 km

Cromlech Boulders

Highlight • Climb

Right opposite the layby are the two main blocks - a good description and link to the topo is at climber.co.uk/outdoor/bouldering/around-the-bloc-the-cromlech-boulders-llanberis

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53.7 km

Pen-y-Pass

Highlight • Parking

Right in the heart of northern Eryri (Snowdonia), Pen-y-Pass is superbly located for adventures on the Yr Wyddfa (Snowdon) massif and the Glyderau. It is a popular starting point for …

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57.1 km

View of Llyn Gwynant

Highlight • Viewpoint

Beautiful view

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64.6 km

Coed Pant-agored

Forest

67.5 km

View of Stone Houses and River from Beddgelert Bridge

Highlight • Viewpoint

From the bridge you have a beautiful view of the rivers Colwyn and Glaslyn and their banks. The bridge stands over the river Colwyn, which flows into the river Glaslyn a little further on (at the footbridge).

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