The Llanberis Pass (Welsh: Bwlch Llanberis; alternative English name, Pass of Llanberis) in Snowdonia carries the main road (A4086) from the south-east to Llanberis, over Pen-y-Pass, between the mountain ranges of the Glyderau and the Snowdon massif. At the bottom of the pass is the small village of Nant Peris.
The Llanberis Pass lies between the mountain massifs of Snowdon and the Glyderau in the county of Gwynedd, in northwestern Wales. The summit of the pass is 359 m (1,178 ft) above sea level, and is the site of the Pen-y-Pass Hotel, now a Youth Hostel. The A4086 road traverses the pass. The Nant Peris valley lies to the northwest descending to the town of Llanberis, the Llyn Peris and Llyn Padarn lakes and continues on as the Afon Rhythallt to Caernarfon and the Menai Strait. The valley is narrow, straight and steep-sided, with rocky crags and boulders on either side of the road.
About one mile to the east of Pen-y-Pass is the Pen-y-Gwryd Hotel. To the east of this are the headwaters of the Dyffryn Mymbyr, a tributary of the River Llugwy which it joins at Capel Curig. To the south of Pen-y-gwryd are the headwaters of the Afon Glaslyn which flows southwestwards towards Beddgelert.
Many fine crags are easily accessible from the road, and the area is very popular with rock climbers and abseilers. On the north side, the principal crags are: Dinas y Gromlech (bearing the famous line of Cenotaph Corner), Carreg Wastad (flat rock), Clogwyn y Grochan (these are together called the Three Cliffs); and further down the valley, Craig Ddu (black rock). On the south side, the principal 'roadside' cliff is Dinas Mot.
The Cromlech Boulders are used for bouldering. These roadside boulders were saved from destruction in a 1973 road widening scheme by a six-year protest by local people, climbers, historians, conservationists and geologists.
Climbers particularly associated with the area include John Menlove Edwards (in the 1930s and 1940s) and Joe Brown (in the 1950s and 1960s). The British 1953 Everest expedition also trained in the area, and were based at the Pen-y-Gwryd Hotel at the eastern end of the pass.
At Pen-y-Pass there is a car park and a cafe, and three different footpaths set off up Snowdon, as well as two others to the east leading to the summits of Glyder Fawr and Glyder Fach. the car park is usually full and a shuttle bus service from Llanberis, with a park and ride runs from near the Vaynor Arms. The Snowdonia Sherpa bus service network run by Express Motors and GHA Coaches operates frequent services between Betws-y-Coed, Capel Curig, Pen-y-Gwryd and Pen-y-Pass and also between Pen-y-Pass, Nant Peris (where there are park and ride facilities) and Llanberis.
- Landranger 115: Snowdon & surrounding area. Ordnance Survey. ISBN 0-319-22115-6.
- Reeves, Mark (1 March 2010). "Llanberis Pass - The fast beating heart of Welsh rock climbing". Retrieved 30 April 2016.
- Lloyd, Harvey (14 May 2004). "The battle of the boulder". Snowdonia: The adventure destination. Retrieved 30 April 2016.
- Walley, Noel. "Places arounf Pen-y-Pass". Retrieved 1 May 2016.
- Robert Andrews (2004). The Rough Guide to Britain: North Wales. Rough Guides. p. 876. ISBN 978-1-84353-301-6.
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