Atlas of Wales

Eryri · Gwynedd · Mountain

Cadair IdrisPenygadair · 893 m · the Chair of Idris

Two official routes climb into a glacier-carved cwm on the roof of southern Eryri, and low cloud hides the summit more often than it shows it. What the day asks depends on the line you choose.

Choose your lineChoose your route Is today the day?

The Chair of Idris: an 893 m mountain in the south of Eryri, its summit cwm holding the lake Llyn Cau, reached by two officially graded National Park routes, the steep Minffordd Path and the popular Pony Path. Both are Hard/Strenuous with sections of scrambling, so read the routes before you read the weather.

Height
893 m
Ways up
Three · Minffordd, Pony, Llanfihangel-y-Pennant
Commitment
About 5–7 hrs across the three lines
Terrain
Steep steps, rim scrambling on graded routes
Exposure & navigation
Exposed on the Minffordd rim

Choose your lineChoose your route

Two official ways up. Pick your line before you pick your day.

Eryri National Park publishes two graded routes to Penygadair: the short, steep Minffordd Path and the longer, popular Pony Path, with a longer southern alternative besides. The board below redraws to your line: its terrain, its shape, its numbers.

Walking routes

The steep steps and the rim above Llyn Cau
Your line
1 2 3 4 5
  1. 1
    Dôl IdrisThe start on the A487. The National Park's shortest route up, and its steepest: the stone steps begin almost at once.
  2. 2
    Into Cwm CauThe path climbs into the glacial amphitheatre that gives the mountain its shape.
  3. 3
    Llyn CauThe cirque lake, the classic Cadair set-piece. Last easy retreat.
  4. 4
    The cwm rimA rocky, exposed rim with sections of scrambling as the path gains the ridge.
  5. 5
    893 mPenygadair summitTrig point and an exposed stone shelter. On a clear day, the Llŷn to the Brecon Beacons, but low cloud hides it more often than not.
1 2 3 4 5
  1. 1
    Tŷ NantThe start a stone's throw from Dolgellau, through small woodland along a stream.
  2. 2
    The northern slopesOut of the trees onto open, rock-clad ground: the popular, steadier line up.
  3. 3
    Llyn y GadairThe lake on the northern side, below the summit crags.
  4. 4
    The upper mountainThe ground steepens, with sections of scrambling near the top.
  5. 5
    893 mPenygadair summitTrig point and shelter, shared with the Minffordd Path.
1 2 3 4
  1. 1
    Llanfihangel-y-PennantThe start in the quiet southern valley: the longest way up, but the gentlest gradient for most of the way.
  2. 2
    The long southern approachA gradual pull across the southern flank of the mountain.
  3. 3
    The upper mountainThe ground steepens toward the summit, with a scramble near the top as on every route.
  4. 4
    893 mPenygadair summitTrig point and shelter. The National Park publishes no grade or figures for this line. Treat the numbers as approximate.

Practical brief

Your lineroute in practice ·

The short, steep climb into Cwm Cau and up the rim above Llyn Cau.

Start point
Dôl Idris car park, on the A487 between Dolgellau and Machynlleth: open the parking area
Parking / booking
No booking system. A parking charge applies (Blue Badge parking; card / contactless). Check the current tariff on arrival.
Public transport
The T2 bus (Aberystwyth–Bangor) stops nearby at "Minffordd, Hotel for Cader Idris". Check Traveline Cymru for times.
Facilities
Accessible toilet in the Dôl Idris car park. Nothing on the route itself.
Return / descent
Reverse the route. Do not descend the Fox's Path: it is loose scree and not a recommended line.
Avoid this route if
Poor visibility on the exposed rim, or winter conditions without the specialist equipment the National Park warns may be required.

The popular northern route from near Dolgellau: longer, but steadier.

Start point
Tŷ Nant car park, a stone's throw from Dolgellau
Parking / booking
No booking system. An Eryri National Park car park: a charge applies.
Public transport
Dolgellau is the nearest town; check Traveline Cymru for local services.
Facilities
Nothing confirmed on the route; nearest facilities in Dolgellau.
Return / descent
Reverse the route. Don't drop down the Fox's Path scree on the far side of the summit.
Avoid this route if
Snow and ice on the upper mountain without full winter kit, or low cloud you can't navigate off the summit in.

A longer, gentler-gradient southern approach: the least steep, but the longest day.

Start point
Llanfihangel-y-Pennant, in the southern valley
Parking / booking
No booking system. Listed by the National Park as free and 24-hour, but village space is limited. Check locally before you set out.
Public transport
No direct service confirmed; check Traveline Cymru.
Facilities
None confirmed on the route.
Return / descent
Reverse the route; don't descend the Fox's Path scree.
Avoid this route if
You want an officially graded route: the National Park publishes no grade or figures for this line (the distance and time are approximate, from Visit Wales).

Route figures, parking, transport and facilities: Eryri National Park Authority (Minffordd Path, Pony Path), Natural Resources Wales and Visit Wales, checked 14 July 2026. The Llanfihangel-y-Pennant figures are approximate and carry no National Park grade. Parking tariffs, fares and seasonal hours change. Confirm current details before you go.

Before you go

Need the exact mountain details?

Parking, buses, toilets, route starts, weather, dogs, emergency and descent planning: checked before you go.

Parking & booking
  • Dôl Idris · Minffordd Path. On the A487 between Dolgellau and Machynlleth (postcode LL36 9AJ). A parking charge applies; card / contactless. Blue Badge parking and an accessible toilet in the car park. Open parking area (opens in a new tab).
  • Tŷ Nant · Pony Path. An Eryri National Park car park near Dolgellau; a charge applies. Open parking area (opens in a new tab).
  • Llanfihangel-y-Pennant · the southern approach. The National Park lists a free, 24-hour car park here, but gives no capacity, no facilities and no location pin for its free car parks, so none is offered. Space in the village is limited; check locally before you set out.

Tariffs change — the National Park reviews them; confirm the current charge on arrival or via Natural Resources Wales — Cadair Idris (opens in a new tab).

Public transport

The TrawsCymru T2 (opens in a new tab) (Bangor–Aberystwyth via Dolgellau and Machynlleth, run by Lloyds Coaches) stops at Minffordd Hotel, a short walk from the Dôl Idris start. Dolgellau, the nearest town, is the base for the Pony Path.

Frequencies and times change with the season. Check the current service before you travel rather than relying on a fixed timetable.

Toilets, food & water
  • Dôl Idris · an accessible toilet in the car park; picnic areas in the parkland at the foot of the mountain.
  • On the mountain · no toilets and no reliable water on any route between the car park and the summit.
  • Summit · nothing at the top: the stone shelter is exposed, not a facility. Carry what you need, and carry it out.
Dogs & livestock

Dogs must be on a lead of no more than 2 metres on open access land between 1 March and 31 July, and under close control near livestock at all times: a farmer may legally act against a dog attacking livestock.

Routes & approach differences

The Minffordd Path and Pony Path are the two National Park-graded routes (both Hard/Strenuous): Minffordd the steeper, more direct climb through Cwm Cau; the Pony Path longer but steadier from near Dolgellau. The Llanfihangel-y-Pennant approach is a real, longer southern line with the gentlest gradient for most of its length, but it carries no National Park grade: its distance and time come from Visit Wales rather than an official register, so treat its figures as approximate. All three converge on the same scramble near the summit and the same Fox's Path hazard on the way down.

Weather, visibility & winter conditions

Losing the line off the summit in mist is what leads people onto the Fox's Path scree by mistake: navigation, not the climbing, is the real hazard up here. Wind accelerates hard on the exposed rim above Cwm Cau, well past anything felt in the valley, and wet rock adds real difficulty to the rim scramble on the Minffordd Path. Snow and ice reach the upper mountain in winter, and the National Park's own route guidance warns specialist equipment may be needed: an ice axe, crampons and the skill to use them, depending on conditions.

The Met Office publishes a location forecast named for Cadair Idris (opens in a new tab), and a separate Eryri/Snowdonia mountain forecast (opens in a new tab) carrying the chance of a cloud-free summit, wind at altitude and the freezing level: figures a location forecast doesn't carry; MWIS (opens in a new tab) adds a written regional view. Read them together: none of them replaces your own judgement about summit wind, cloud, visibility, snow and ice.

Descent planning & route mistakes

No escape route off Cadair Idris is documented. Plan to reverse the way you came up, and identify your line down before you leave the summit, especially in cloud.

Do not descend the Fox's Path: it drops the north face on steep, loose scree and is not a recommended route. It looks direct on a map and catches tired walkers out.

Emergency & what not to rely on

Dial 999 or 112 and ask for Police, then Mountain Rescue. Register for emergencySMS in advance so you can text 999 if you can't get a voice signal. Give your location, what's happened, and how many are in your group.

The buses and car parks run to a timetable, not to you: none is a rescue plan. AdventureSmart (opens in a new tab) sets out the basics: the right knowledge and skills, the right weather, the right gear.

Accessibility & realistic limitations

All three lines are graded or treated as Hard/Strenuous, with sections of scrambling: there is no step-free or easy way to the summit on any of them. The short, accessible-graded parkland trails at Dôl Idris are the family-friendly option at the foot of the mountain, not a substitute for the summit routes.

Sourced from Eryri National Park Authority (route pages, safety, dogs, camping), Natural Resources Wales and Visit Wales, checked 14 July 2026. Wild camping is not permitted anywhere in Eryri without the landowner's permission. Parking tariffs and bus times change. Confirm before you travel.

The reckoning

Now: is today the day?

You have seen the line and the climb; the last question is the weather. Cadair Idris is a fair-weather mountain: low cloud hides the summit more often than it shows it, and the higher you go the less the valley forecast means.

Cadair Idris forecast (opens in a new tab) MWIS regional forecast (opens in a new tab)

The Met Office link is a location forecast named for Cadair Idris; MWIS is a regional mountain forecast for Eryri/Snowdonia. Read them together: a location forecast is not a substitute for judging summit wind, cloud, visibility, snow and ice yourself. Valley sunshine does not guarantee a clear summit, and a late start eats the daylight you need to get down. Judge the day by the top, not the car park.

  • Cloudbase decides the view

    The summit sits in cloud on many days. The Met Office mountain forecast publishes the chance of a cloud-free summit: a figure a valley forecast simply doesn't carry.

  • Wind funnels on the ridges

    Bwlchau and ridge lines accelerate the wind well past the valley reading. On the exposed sections it turns people back before the gradient does.

  • Low cloud on the top

    The summit sits in cloud on many days. In mist, finding the right line off Penygadair matters far more than the view, and drifting the wrong way leads onto the Fox's Path scree.

Winter is a different mountain. Snow and ice reach the upper mountain, and the National Park's route guidance warns that specialist equipment may be required: axe, crampons, and the skills to use them. Don't attempt the summit without them.

Good fit for

  • Walkers ready for a long, strenuous day with scrambling near the rim
  • Anyone wanting a choice of three genuinely different approaches
  • Parties confident holding their line off the summit in cloud

Think twice if

  • You want an easy or step-free way to the top: none of the three lines offers one
  • You're bringing a family expecting a gentle walk: the Dôl Idris parkland trails are the option at the foot, not the summit
  • You're uneasy with exposure on the Minffordd rim

The summit

What the climb gives back.

You climb for the view, but Cadair Idris doesn't always give it up. On clear days the panorama opens from the Llŷn peninsula to the Brecon Beacons; on cloud days, the trig point and the ground underfoot are the only things you're guaranteed.

The rocky summit of Cadair Idris (Penygadair) on a clear day: the trig point on its cairn, and a walker standing on the boulders, under blue sky
Penygadair, the summit of Cadair Idris

At the top

The trig point

The trig pillar on Penygadair, 893 m, set on its cairn of stones: the highest point of the Cadair Idris range, and the summit marker for one of Eryri's best-known peaks.

Underfoot

A broad, rocky dome

Shattered rock covers the whole summit: room to stand and take it in, but ground that wants care, especially with low cloud down or the Fox's Path scree close by on the way off.

Weather permitting

The view, when it comes

On a clear day the panorama reaches from the Llŷn peninsula to the Brecon Beacons, but low cloud hides Cadair Idris's summit more often than visitors expect, so treat a clear top as a bonus, not something to plan the day around.

The way down

Before you leave the summit.

Before you leave the summit, confirm your descent route. Most of the day's trouble comes after the top. Read the notices, then make the call.

A steep, loose path falling away down the flank of Cadair Idris under a grey sky
Summit noticeboard
1

Wrong path down

Even experienced walkers take the wrong line when tired.

  • Check the route before you set off.
  • Do not follow vague trods or other groups.
  • If unsure, stop and re-check.
Common mistake
2

Fading light

Conditions change quickly. Do not get caught out.

  • Turn around early enough to avoid a late finish.
  • Keep headtorches ready.
  • Plan for slower progress than you expect.
Turn back early
3

Tired group

Fatigue slows decisions and increases risk.

  • Watch for lagging, quiet, unsteady people.
  • Take a proper break.
  • If needed, choose the easier, safer option.
Know your limits
4

Transport is not rescue

Buses and parking run to timetables, not to you.

  • Plan your exit before you start.
  • Do not rely on signal, luck, buses or trains.
  • Self-reliance keeps the group safe.
Plan, don't rely

The Fox's Path, not a way downThe direct-looking line off the north face is steep, loose scree and not a recommended route. Don't be tempted to descend it. Reverse your ascent instead.

Back in the valley.

The mountain casts a long day. These are the places around it.

The stone market town of Dolgellau below the northern side of Cadair Idris
Pony Path town

Dolgellau

The stone market town below the mountain's northern side, a stone's throw from the Pony Path start.

Read the guide →
Barmouth Bridge, the timber railway viaduct crossing the Mawddach estuary
The estuary mouth

Barmouth

The seaside town at the mouth of the Mawddach, where the timber viaduct crosses: the coast end of the same estuary the Pony Path looks down.

Read the guide →
The Coed y Brenin Visitor Centre building among the trees, Gwynedd
North of Dolgellau

Coed y Brenin

Nine thousand acres of working forest north of Dolgellau: Britain’s first mountain-bike forest, and a low-level day when the summit is in cloud.

Read the guide →
Aberdyfi's painted seafront terraces seen from the sand, walkers on the beach and the jetty at the far end
The Dyfi estuary

Aberdyfi

A village one street long on the north shore of the Dyfi, south of the Minffordd side: a bronze bell on the jetty the tide rings by itself, and the evening after.

Read the guide →

On the Atlas

Continue from Cadair Idris.

Above Dolgellau, on the roof of southern Eryri.

Open Cadair Idris on the map

Continue exploring

The cwm closes behind you.Cadair Idris lingers beyond the descent.

Carry the scale of the cwm into the wider landscape of Gwynedd.

Open Cadair Idris on the map Open Gwynedd Atlas