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Llanberis Pass – Pen-y-Pass loop from Cwm Dyli Power Station

Llanberis Pass – Pen-y-Pass loop from Cwm Dyli Power Station

Moderate

106

riders

Llanberis Pass – Pen-y-Pass loop from Cwm Dyli Power Station

01:08

20.7km

410m

Road cycling

Moderate road ride. Good fitness required. Some segments of this route may be unpaved and difficult to ride. The starting point of the route is right next to a parking lot.

Last updated: February 27, 2026

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After 4.99 km for 206 m

Waypoints

Start point

Parking

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1.84 km

Mallory's Café

Highlight • Cafe

Iconic Pen y Pass is the access point to both the Miners’ and Pyg Track trailheads leading to Yr Wyddfa’s summit. At the pass are toilets, a café, and a drinking-water tap.

If you are coming from Nant Peris the average grade of this col is 5.3% with a maximum of 9.6%. The Pen-y-Pass ascent starts at 113 meters and goes to 360 meter at the top, a total of 247 ascending meters.

Tip by

4.11 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

There are more higher up on the hill and you will find boulderars here at most times of the weather permits.

Tip by

5.08 km

Nant Peris Valley

Highlight (Segment) • Viewpoint

Nant Peris valley is a picturesque and enchanting valley located in Snowdonia National Park, Wales. Surrounded by towering mountains and lush greenery, it offers breathtaking natural beauty and a tranquil escape from the hustle and bustle of daily life. The valley is known for its stunning landscape, with cascading waterfalls, sparkling rivers, and rugged cliffs. It provides a haven for outdoor enthusiasts, offering numerous hiking trails and opportunities for rock climbing and mountaineering. Visitors can explore the valley’s scenic beauty, breathe in the fresh mountain air, and immerse themselves in the peaceful serenity of this idyllic setting.

Tip by

10.3 km

Llanberis Village and Llyn Padarn

Highlight • Settlement

Llanberis is synonymous with Yr Wyddfa (Snowdon). It's a popular starting point for some of the easier ways to the roof of Wales. Whether it’s via the Llanberis Path or a ride on the Snowdon Mountain Railway, thousands of people every year head to the village with the summit in their sights.

Long before it was a draw to tourists and hikers, Llanberis was a slate mining town. The Dinorwig Quarry's slate tips are a stark reminder of the region’s heritage.

The village is blessed with several good outdoor gear shops and characterful places to eat and drink.

Tip by

10.4 km

Llanberis Lake Railway

Highlight • Structure

Not been on this myself but on a conversation with a member of the public I'm told it's a wonderful journey around to the north side of the lake away from the hustle and bustle of the South side

Tip by

13.7 km

Llanberis Pass

Highlight • Mountain Pass

The Llanberis Pass is a spectacular road climb in Snowdonia National Park, Gwynedd. It is the pass between Glyderau and Snowdon Massif at 359 metres above sea level. It also houses the Pen-y-Pass Youth Hostel and car park which is a popular starting location for climbing Snowdonia on foot. It's just over 5 miles from Llanberis to Pen-Y-Pass.

Tip by

13.9 km

Llanberis Pass – Pen-y-Pass Climb

Highlight (Segment) • Climb

Awesome mountain road from Nant Peris in the west to the top of Pen-y-pass in the east. It's a long climb up from Nant Peris or an exciting descent in the other direction. The A4086 follows the Llanberis Pass with historically important rock climbing and bouldering on both sides. Snowdon is to the south and the Glyders to the north.
Café and shop at the car park at the top along with the YHA Pen-y-pass. There is a nice pub in Nant Peris and cafes and shops in Llanberis a bit further down the road,

Tip by

18.9 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 the Miners' and Pyg Tracks to Yr Wyddfa, as well as for the exciting scrambles on Crib Goch.

The excellent youth hostel has a rich mountaineering heritage. It was famously the haunt of George Mallory, who became part of Everest legend when he died attempting to be the first person to climb the world's highest peak in 1924. Whether or not he ever made it to the summit is one of the greatest mysteries in adventure history. The hostel's Mallory's Bar, is named in his honour.

Tip by

20.7 km

End point

Parking

Way Types & Surfaces

Way Types

20.3 km

241 m

< 100 m

Surfaces

20.4 km

241 m

< 100 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 (110 m)

Weather

Monday 11 May

11°C

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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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Llanberis Pass – Pen-y-Pass loop from Cwm Dyli Power Station

Mallory's Café

Cromlech Boulders

Nant Peris Valley

Llanberis Village and Llyn Padarn

Llanberis Lake Railway

Llanberis Pass

Llanberis Pass – Pen-y-Pass Climb

Pen-y-Pass

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