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Y Garn to Glyder Fach trail running loop — Parc Cenedlaethol Eryri | Snowdonia National Park

Routes

Running trails & routes

Y Garn to Glyder Fach trail running loop — Parc Cenedlaethol Eryri | Snowdonia National Park

Hard

5.0

(1)

runners

Y Garn to Glyder Fach trail running loop — Parc Cenedlaethol Eryri | Snowdonia National Park

02:19

11.5km

930m

Running

Embark on the Y Garn to Glyder Fach trail running loop, a difficult 7.2-mile (11.5 km) adventure in Snowdonia National Park that promises spectacular views and challenging terrain. This route, which typically takes around 2 hours and 19 minutes to complete, features a significant elevation gain of 3066 feet (934…

Last updated: April 23, 2026

Tips

Your route passes through a protected area

Please check local regulations for:

Parc Cenedlaethol Eryri

Waypoints

Start point

Parking

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990 m

Cwm Idwal

Highlight • Lake

A beautiful lake with stunning views to Tryfan and Pen Yr Ole Wen. There is a circular walk from the visitors centre which takes you around the lake or you …

Tip by

3.13 km

Y Garn Summit

Highlight • Summit

Y Garn of the Glyderau is a mountain of two halves. On one side it drops in continuous green slopes to the pass of Llanberis. On its other it’s a …

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4.40 km

Lake of the Dogs

Highlight • Natural

Take some time to enjoy the peaceful atmosphere at this small mountain lake Llyn Y Cwn (Welsh for Lake of the Dogs). The peak of Y Garn rises to the …

Translated by Google •

Tip by

5.49 km

Glyder Fawr summit

Highlight • Summit

The summit of Glyder Fawr is magnificent. On a clear day you will see incredible views of Snowdon, Crib Goch and Garnedd Ugain. At 3,284 feet (1,001 m), it is the highest peak in the Glyderau range.

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7.07 km

Glyder Fach summit and the Cantilever Stone

Highlight • Summit

Home to the impossibly-balanced, much-photographed Cantilever Stone, Glyder Fach is the highlight of the Glyders: a world of jumbled boulders and craggy outcrops, soaring sumptuously above Llyn Ogwen. For an …

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9.14 km

Bwlch Tryfan (Tryfan Pass)

Highlight • Trail

Bwlch Tryfan is the pass between two of Wales' finest mountains: Tryfan and Glyder Fach. A number of trails meet here and the adventures it gives access to are wonderful. …

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11.5 km

End point

Parking

Way Types & Surfaces

Way Types

5.93 km

4.12 km

776 m

674 m

< 100 m

Surfaces

7.13 km

3.60 km

472 m

157 m

< 100 m

Elevation

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

Weather

Tuesday 14 July

26°C

12°C

0 %

Additional weather tips

Max wind speed: 21.0 km/h

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Y Garn to Glyder Fach trail running loop — Parc Cenedlaethol Eryri | Snowdonia National Park

Cwm Idwal

Y Garn Summit

Lake of the Dogs

Glyder Fawr summit

Glyder Fach summit and the Cantilever Stone

Bwlch Tryfan (Tryfan Pass)

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