At a glance
South Snowdonia's most famous mountain at 893 m — three waymarked paths, spectacular Cardigan Bay views, the dramatic cliff-backed Llyn Cau, and the legend that sleeping on the summit makes you a poet or a madman.
About Cadair Idris
Cadair Idris — the Chair of Idris — rises to 893 m at its highest point, Penygadair, above the market town of Dolgellau in the southern part of Eryri (Snowdonia) National Park. It is one of the most evocative and brooding mountains in Wales, with steeply glaciated cwms on its northern flank containing cold dark lakes, dramatic cliff-lines, and an atmosphere that seems charged with legend even in clear weather.
The mountain is bounded to the north by the Mawddach estuary and to the south by the Tal-y-llyn valley — a glacially over-deepened trough holding Tal-y-llyn lake at its base. The northern escarpment is particularly impressive: Cwm Cau, a near-perfect glacial corrie enclosed by 300-metre cliffs, contains Llyn Cau — one of the most dramatically situated mountain lakes in Wales. The Minffordd Path ascends through this cwm and is the most scenically rewarding route.
Three waymarked routes ascend the mountain: the Minffordd Path from the south (the most dramatic, via Llyn Cau), the Pony Path from the northwest (the most popular and gradual), and the Fox's Path from Dolgellau directly up the northern cwm (the steepest and requiring most care). All three converge near the summit ridge and are clearly marked throughout.
The three routes up Cadair Idris
- Minffordd Path
- 7 miles return · 5–6 hours · starts Minffordd car park (SY20 9DH). The finest route — through oak woodland, past the dramatic Llyn Cau cwm, and up the south ridge. Best for experienced walkers wanting the most scenic circuit.
- Pony Path
- 10 miles return · 5–7 hours · starts Dol Idris car park near Llanfihangel y Pennant. The most gradual ascent — well-maintained path, good for first-timers and those with dogs. Views to Barmouth and Cardigan Bay throughout.
- Fox's Path
- 6 miles return · 4–5 hours · starts Dolgellau (SY20 8DX). Steep direct ascent up the northern cwm — loose ground on upper section. For experienced walkers only; good descent route if combined with Minffordd ascent.
Safety information
Welsh mountains demand respect. Conditions can change in minutes — even Snowdon in July sees casualties from inadequate kit and unexpected weather.
Carry: waterproofs, walking boots, warm layer, hat & gloves, OS Explorer OL17 (Snowdonia) or OL18 (Harlech & Bala), 1.5 L water, charged phone, head torch. Check the weather at mwis.org.uk on the morning. In an emergency call 999, ask for Police / Mountain Rescue, give your what3words location. Local team: Aberdyfi Search and Rescue Team.
Find it on the map
Frequently asked questions
Cadair Idris (Penygadair, the highest point) stands at 893 metres — the fifth-highest mountain in Wales. It lies in the southern part of Eryri (Snowdonia) National Park above the market town of Dolgellau and is a prominently visible landmark from the Cardigan Bay coast.
Cadair Idris translates as "the Chair of Idris" in Welsh — a reference to the legendary giant Idris Gawr, a poet-warrior of Welsh mythology who supposedly sat here to study the stars. The summit plateau (Penygadair) contains a large natural hollow that, with some imagination, resembles the seat of an enormous chair.
Welsh legend holds that anyone who sleeps a night on the summit of Cadair Idris will wake in the morning either a poet or a madman — or, in some versions, not wake at all. The origin of the legend is uncertain, but it speaks to the mountain's powerful and brooding atmosphere, particularly in mist or storm.
The Pony Path (also called the Llanfihangel y Pennant route) from Dol Idris car park is the most gradual and beginner-friendly — a 10-mile return with 850 m of ascent, well-maintained path. The Minffordd Path is shorter (7 miles return) but steeper and more dramatic, passing Llyn Cau in a dramatic cliff-backed cwm. The Fox's Path from Dolgellau is steep and requires care on loose ground.
On a clear day, yes — Cardigan Bay is directly visible to the west from the summit, with the Llŷn Peninsula stretching north and the Pembrokeshire coast visible to the south. The famous Barmouth Viaduct (the long Victorian railway bridge) is clearly visible below to the northwest.
For a summer weekend, start by 08:00–09:00. Minffordd and Dol Idris car parks fill by mid-morning in July and August. In good weather, the summit is usually clear until afternoon cloud builds in — aim to reach the top by midday and begin descending before 14:00. Always check the mountain weather at mwis.org.uk on the morning.