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Mountain biking trails

Caernarfon Castle – Pen-y-Pass loop from Porthmadog

Routes

Mountain biking trails

Caernarfon Castle – Pen-y-Pass loop from Porthmadog

Moderate

riders

Caernarfon Castle – Pen-y-Pass loop from Porthmadog

04:54

79.8km

860m

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: May 10, 2026

Tips

Includes a segment in which cycling is not permitted

After 68.1 km for 61 m

Waypoints

Start point

Train Station

Get Directions

4.45 km

View of Porthmadog

Highlight • Viewpoint

31.9 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 …

Tip by

41.0 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.

Translated by Google •

Tip by

45.8 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 …

Tip by

51.0 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

Tip by

53.3 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 …

Tip by

56.6 km

View of Llyn Gwynant

Highlight • Viewpoint

Beautiful view

Translated by Google •

Tip by

59.2 km

View of the Winding Road in Eryri National Park

Highlight • Viewpoint

winding area

Translated by Google •

Tip by

64.1 km

Coed Pant-agored

Forest

71.3 km

Parc y Llŷs

Forest

77.3 km

Coed Tremadog National Nature Reserve

Nature Reserve

79.8 km

End point

Train Station

Way Types & Surfaces

Way Types

29.9 km

23.3 km

13.3 km

6.97 km

3.08 km

3.05 km

279 m

Surfaces

63.1 km

8.11 km

3.73 km

2.97 km

1.03 km

877 m

Elevation

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

Highest point (360 m)

Lowest point (0 m)

Weather

Wednesday 1 July

19°C

13°C

0 %

Additional weather tips

Max wind speed: 14.0 km/h

to get more detailed weather forecasts along your route

Comments

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Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.

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Caernarfon Castle – Pen-y-Pass loop from Porthmadog

View of Porthmadog

Caernarfon Castle

Snowdon Inn Campsite

View of Llyn Peris and Dinorwig Quarry

Cromlech Boulders

Pen-y-Pass

View of Llyn Gwynant

View of the Winding Road in Eryri National Park

Nearby routes

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