Routes up
Craig Cwm Silyn routes: 3 ways to the top
Nantlle Ridge from Rhyd DduHiking · 5.4 km one way · from Rhyd Ddu westbound public pathHard
Nantlle Ridge from NeboHiking · 5.8 km one way · 600 m ascent · ~2h 10m · from Llyn Cwmdulyn road-end car park, NeboHard
Llynnau Cwm Silyn approachHiking · 7.0 km one way · 690 m ascent · ~2h 35m · from Llyn Cwmdulyn road-end car park, NeboHard
Summit today
Is it safe to climb Craig Cwm Silyn today?
Loading the summit forecast…
Cloud inversion · 7 days
The chance of standing above a sea of cloud on Craig Cwm Silyn each morning this week, from overnight temperature, humidity and low cloud below the 734m summit.
Dark sky · 7 days
How dark the sky gets over Craig Cwm Silyn each night this week, from cloud cover, moonlight and local light pollution.
Snow · 7 days
Snowfall and lying snow at the summit over the next 7 days.
Sun today
Sunrise 07:07, sunset 16:53
9h 47m of daylight. Golden hour ends 07:57 and starts 16:02. From the summit you see the sun 07:01 to 16:59.
Nearby summits
Close to Craig Cwm Silyn
About Craig Cwm Silyn
Craig Cwm Silyn is the highest summit on the Nantlle Ridge, the line of hills running west from Rhyd Ddu towards the Llŷn. Garnedd-goch lies 1.6 km south-west, and Mynydd Tal-y-mignedd and Trum y Ddysgl stand to the north-east. Moel Hebog, the nearest higher hill, is 5.1 km south-east.
Below the north face sit the Llynnau Cwm Silyn, two lakes under the cliffs of the Great Slab, a well-known rock climbing crag. The quickest way up starts from the road end above the lakes and climbs the grassy flank to the stony summit plateau. Many walkers instead cross the whole Nantlle Ridge from Rhyd Ddu, which has short scrambling steps on its eastern half and needs transport at the far end.
The summit is a broad stony top with views across Caernarfon Bay and over to Yr Wyddfa (Snowdon).
Craig Cwm Silyn is 734 m (2,408 ft) high with 398 m of prominence. It is in Snowdonia, Wales. It is the 53rd highest of the 152 summits Peakify lists in Snowdonia. The nearest summits are Mynydd Tal-y-mignedd (1.5 km), Garnedd-goch (1.6 km) and Trum y Ddysgl (2.4 km).
What is the highest point of the Nantlle Ridge?
Craig Cwm Silyn, at 734 m, is the highest summit on the Nantlle Ridge.
What is the easiest way up Craig Cwm Silyn?
The route from the road end near the Llynnau Cwm Silyn is the shortest, on grass and stones without scrambling.
Can you climb Craig Cwm Silyn and Garnedd-goch together?
Yes. Garnedd-goch is 1.6 km south-west along the ridge.
How high is Craig Cwm Silyn?
Craig Cwm Silyn is 734 metres high with 398 metres of prominence.
Where is Craig Cwm Silyn?
Craig Cwm Silyn is listed in Snowdonia, Wales.
Are there routes for Craig Cwm Silyn?
Peakify lists 3 routes for Craig Cwm Silyn, including available distance, ascent, start point, and difficulty details. The easiest is Nantlle Ridge from Rhyd Ddu (5.4 km one way, Hard).
Is it safe to climb Craig Cwm Silyn today?
Peakify rates each day on the summit Good, Marginal or Poor from the forecast summit wind, gusts, chance of rain and wind chill. Wind of 40 mph or gusts of 65 mph make it Poor; wind of 25 mph, gusts of 45 mph, a 60% chance of rain or a feels-like temperature of -8°C or below make it Marginal. Today's and tomorrow's ratings are at the top of this page. The rating covers the weather only: also check your route, daylight, kit and experience, and in winter whether you need an ice axe and crampons.
What weather information is shown for Craig Cwm Silyn?
The page includes cached mountain forecast context, snow outlook, dark-sky signals, cloud-inversion information, sunrise, sunset, and summit planning details where available.
Peakify is run by Sam Tyler, who has climbed Yr Wyddfa 22 times. The forecast refreshes every hour; how our forecast works.
