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Caernarfon Castle – Snowdon Summit (Yr Wyddfa) loop from Caernarfon

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Running trails & routes

Caernarfon Castle – Snowdon Summit (Yr Wyddfa) loop from Caernarfon

Hard

174

runners

Caernarfon Castle – Snowdon Summit (Yr Wyddfa) loop from Caernarfon

06:44

52.4km

1,620m

Running

Hard run. Very good fitness required. Sure-footedness, sturdy shoes and alpine experience required. The starting point of the route is accessible with public transport.

Last updated: July 28, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

Gwarchodfa Natur Genedlaethol Yr Wyddfa

Parc Cenedlaethol Eryri

Waypoints

Start point

Bus stop

Get Directions

673 m

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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18.4 km

Cwm Maesgwm (Telegraph Valley)

Highlight • Trail

Cwm Maesgwm is known as Telegraph Valley because of the power lines that run up it. It's a great way of gaining height out of Llanberis without using the busy …

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21.4 km

Steep Section of the Snowdon Ranger Path

Highlight (Segment) • Trail

The Snowdon Ranger Path climbs Yr Wyddfa (Snowdon) from the Snowdon Ranger Youth Hostel in the west. It's about 4 miles (6.5km) each way with 3,071 feet (936m) of ascent. …

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23.6 km

Bwlch Glas Pass

Highlight • Natural Monument

The finger stone at Bwlch Glas marks the point at which the Pyg and Miners' Tracks reach the summit ridge and join the Crib Goch, Ranger and Llanberis Paths. Particularly helpful in poor visibility.

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24.2 km

Snowdon Summit (Yr Wyddfa)

Highlight • Summit

Snowdon (Yr Wyddfa) is perhaps the most ascended mountain in the world, and with good reason. This is a majestic mountain, as is befitting of Wales' highest point.

Its glory …

Tip by

24.8 km

View of the Pyg Track and Lakes in Snowdonia National Park

Highlight • Trail

planned to take this route but parking is scarce, so be careful

Tip by

33.0 km

Ruins

35.3 km

View of the Lake and Mountains

Highlight • Mountain Pass

35.5 km

View of Llyn Padarn from the Old Quarry Hospital

Highlight • Viewpoint

Great lake in llanberis that is just the right length for an evening stroll, some fantastic views from the north side over the lake, and if you go through the …

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36.0 km

Viewpoint

52.4 km

End point

Bus stop

Way Types & Surfaces

Way Types

19.4 km

12.4 km

11.7 km

3.16 km

2.25 km

1.27 km

Surfaces

16.0 km

10.6 km

10.0 km

6.75 km

5.17 km

3.87 km

Elevation

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

Highest point (1,040 m)

Lowest point (0 m)

Weather

Monday 10 August

26°C

11°C

0 %

Additional weather tips

Max wind speed: 19.0 km/h

to get more detailed weather forecasts along your route

Comments

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Caernarfon Castle – Snowdon Summit (Yr Wyddfa) loop from Caernarfon

Caernarfon Castle

Cwm Maesgwm (Telegraph Valley)

Steep Section of the Snowdon Ranger Path

Bwlch Glas Pass

Snowdon Summit (Yr Wyddfa)

View of the Pyg Track and Lakes in Snowdonia National Park

View of the Lake and Mountains

View of Llyn Padarn from the Old Quarry Hospital

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