The A4086 through the Llanberis Pass is the road riders come to north Wales for: a narrow, straight-sided glacial valley between the Snowdon massif and the Glyderau, climbing to Pen-y-Pass at 359 m (1,178 ft) and dropping to Nant Peris and Llanberis on the other side. It sits inside a national park of 823 square miles (2,130 km²) that contains all fifteen Welsh mountains over 3,000 feet, including Yr Wyddfa (Snowdon) at 1,085 m (3,560 ft). One thing to get right before you plan a trip: since 2022 the park authority has used the Welsh names Eryri and Yr Wyddfa in its own communications, so signage, maps and official pages increasingly say Eryri rather than Snowdonia. And you ride on the left here, at speeds posted in miles per hour.
Eryri or Snowdonia, and why it matters on the road
The national park was designated in October 1951, the first of the three Welsh national parks and the third in the UK. In November 2022 the park authority voted to use Yr Wyddfa rather than Snowdon, and Eryri rather than Snowdonia, in all its official communication, after a petition signed by around 5,000 people. In 2024 the authority described the change as a success and confirmed it would continue. Practically this means the name on a park sign, a car park board or a park website may not match the name on your older map or in your satnav's place database. Search for both.
The names themselves are unrelated. Snowdon comes from Old English elements meaning snow hill and is first recorded as Snawdune in 1095, while Eryri is first recorded in 1191 and probably derives from eryr, meaning ridge, with a popular reading of place of the eagle. Yr Wyddfa is the Welsh name for the mountain and has nothing to do with either.
Route at a glance
| Road | Summit or length | Character | Start and end |
|---|---|---|---|
| A4086 Llanberis Pass | Pen-y-Pass at 359 m (1,178 ft) | Straight-sided valley, rock and boulders to the roadside, heavy walker traffic | Capel Curig area to Llanberis via Pen-y-Pass and Nant Peris |
| A498 Nant Gwynant | Roughly 12 miles (19 km) | Lakes, forest and open flanks below Yr Wyddfa, flowing curves | Pen-y-Gwryd down to Beddgelert |
| A470 through the park | The main north-south spine of Wales | Faster A-road, narrow and twisting on the older sections, limited overtaking | Betws-y-Coed south towards Dolgellau |
| Bwlch y Groes | Summit at 545 m (1,788 ft) | Second highest public road pass in Wales, single-track minor roads, severe gradients | Dinas Mawddwy to Llanuwchllyn or Lake Vyrnwy |
| Cadair Idris and the south of the park | Southern third of the national park | Quieter, wider valleys, coast between Porthmadog and Aberdyfi | Dolgellau to the Dyfi estuary |
Open the Llanberis Pass crossing in Google Maps — Capel Curig over Pen-y-Pass and down to Llanberis, ready to send to your navigation.
The A4086 over Pen-y-Pass
The Llanberis Pass — Bwlch Llanberis in Welsh — carries the A4086 from the south-east over Pen-y-Pass and down into Llanberis, running between the Glyderau on one side and the Snowdon massif on the other. The valley is narrow, straight and steep-sided, with crags and boulder fields coming right down to the road edge on both sides. It is short, and it is not technically demanding, but it is one of the few roads in Britain that puts genuine mountain terrain within a metre of your handlebars.
The complication is people. At Pen-y-Pass there is a car park, a cafe and the trailheads for three routes up Yr Wyddfa plus two more onto Glyder Fawr and Glyder Fach. The car park is usually full, so a park-and-ride shuttle runs from Llanberis and the Sherpa bus network runs services between Betws-y-Coed, Capel Curig, Pen-y-Gwryd, Pen-y-Pass, Nant Peris and Llanberis. Some 543,541 people walked up Yr Wyddfa in 2022, and a fair share of them arrive by road. Expect parked cars on the verges, walkers crossing without looking, and buses using the full width on the bends. Ride it early or ride it in October.
About a mile east of Pen-y-Pass is the Pen-y-Gwryd Hotel, which is the traditional stopping point and the junction where most riders turn south onto the A498 down Nant Gwynant to Beddgelert. That descent, with the lakes on your right and the flank of Yr Wyddfa above, is the section people usually rate higher than the pass itself.
Bwlch y Groes and the quieter south
If the central passes are too busy, the answer is the southern half of the park. Bwlch y Groes, the pass of the cross, is the second highest public road mountain pass in Wales at 545 m (1,788 ft), beaten only by the Gospel Pass in the south of the country. It sits on minor roads linking Dinas Mawddwy via Llanymawddwy with Llanuwchllyn and Lake Vyrnwy, and the view from the summit takes in the Dyfi valley, Cadair Idris and a close look at Aran Fawddwy. A cross just below the summit marks the pass's place on an old pilgrim route from north Wales.
This is single-track riding with passing places, sharp gradients and gates, and it is the opposite experience to the A4086: you may not see another vehicle for twenty minutes. The park also runs much further south than the name suggests, taking in the Rhinogydd, Cadair Idris, the Aran range, the Dyfi Hills and most of the coast between Porthmadog and Aberdyfi. Riders who only do the Llanberis Pass see maybe a fifth of it.
Riding rules that catch out visitors
You ride on the left. Obvious in principle, less obvious at seven in the morning pulling out of an empty car park, or at a junction after a fuel stop. The two moments visiting riders most often get it wrong are leaving a stop and entering a roundabout, which here goes clockwise and gives way to traffic from the right.
Speed limits are in miles per hour. All UK signs are mph, and so are the distances on direction signs. On a bike, the national speed limit is 60 mph on a single carriageway and 70 mph on a dual carriageway or motorway. Neither is remotely achievable on the roads in the table.
Wales has a default 20 mph limit in built-up areas. On 17 September 2023 the Welsh Government changed the default limit on restricted roads — broadly, residential and built-up streets with street lighting — from 30 mph to 20 mph. It is not a blanket limit on all roads, and some routes have been returned to 30 mph by local authorities since, but the default through villages such as Llanberis, Beddgelert and Betws-y-Coed is now 20 mph unless signed otherwise. This is the single most common way a visiting rider collects a ticket in Wales.
Passing places are for passing, not parking. On the single-track roads in the south of the park, a passing place exists to let oncoming vehicles through and to let faster traffic behind you get past. Pull in and wave people through if someone has been sitting behind you. Never stop in one for a photograph, and never block one — farm vehicles need them and the local view of visitors depends on it. If the passing place is on your right, stop opposite it rather than crossing into it.
Sheep. Unfenced upland roads here have sheep on them, and they move without warning, particularly at dawn and dusk and in fog. They are also the reason gates across minor roads exist — leave them as you found them.
Practical details
Season. The park is rideable all year and nothing closes seasonally, but winter brings ice on the high sections and short daylight. May, June and September are the best combination of weather, daylight and traffic. Rain should be assumed in any month; this is one of the wettest parts of Britain.
Fuel. Llanberis, Betws-y-Coed, Beddgelert and Dolgellau have fuel. Between them, in the south of the park especially, stations are sparse and many close early and on Sundays. Fill up when you see one rather than when you need one.
Parking. Pay-and-display is the norm at every trailhead and viewpoint, and Pen-y-Pass in particular is pre-booked in season. Verge parking is increasingly enforced.
Signal. Mobile coverage is poor to non-existent in the valleys, and the pass itself is a black spot. Do not rely on live routing.
Gear notes for Eryri
Two things about north Wales shape what you want fitted. The first is coverage: routing that depends on a live data connection stops working somewhere around Nant Peris and does not come back reliably until you are down in Betws-y-Coed, so download the whole area before you leave — our offline navigation guide covers doing that properly, and a riding system display stays legible in the rain that a phone screen cannot cope with. The second is that a lot of your riding here happens on single-track roads with hedges, gates and sheep, where a recorded account of a near miss is worth having; riders touring on the JADO S6 get map, tyre pressures and dash cam footage on one screen. Cold, wet mountain air also moves tyre pressures more than riders expect, which is the mechanism set out in our guide to pressure drops in cold weather, and a TPMS sensor makes it a number rather than a guess. If Eryri is one leg of a British trip, our England and Wales roads overview and the Scottish roads guide cover what to add.
FAQ
Is it called Snowdonia or Eryri now?
Both names are in use, but the national park authority has used Eryri and Yr Wyddfa in its official communication since a vote in November 2022, and reaffirmed that policy in 2024. Signage and official maps increasingly use the Welsh names, so search for both when planning.
What is the best motorcycle road in the park?
The A4086 through the Llanberis Pass is the famous one, but many riders prefer the A498 down Nant Gwynant to Beddgelert, which flows better and is less clogged with walker traffic. For solitude, Bwlch y Groes in the south of the park.
What speed limits apply?
All limits are in mph. Since September 2023 the default on Welsh restricted roads — built-up streets — is 20 mph rather than 30 mph, so village limits through Llanberis and Beddgelert are lower than visitors expect. Outside built-up areas the national limit for a motorcycle is 60 mph on single carriageways.
When should you avoid the Llanberis Pass?
Summer weekends and bank holidays. With over half a million people a year walking up Yr Wyddfa, the Pen-y-Pass car park fills early and the road fills with shuttle buses, parked cars and pedestrians. Early mornings and midweek autumn days are a different road entirely.
How many days do you need?
Two days covers the central passes — Llanberis, Nant Gwynant and the roads around Capel Curig. Four to five days lets you include Bwlch y Groes, Cadair Idris, the coast to Aberdyfi and the Llŷn peninsula to the west.
