South-west ridge from Ogwen and Carneddau ridge up Carnedd Llewelyn: route map, distance and time
1,064 m · Snowdonia
Carnedd Llewelyn is the highest summit of the Carneddau, a broad, stony plateau at the centre of Snowdonia's northern range.
A hard mountain walk to the summit from Ogwen Cottage north-side path.
The South-west ridge from Ogwen and Carneddau ridge starts at about 314 m and gains 911 m over 6.5 km to 1,049 m on the track. It is steep from the start: the first kilometre climbs 404 m (40%). The steepest kilometre is the one ending at 1 km, which climbs 404 m at an average of 40%, with a 500 m stretch from 0.5 km at about 52%. It keeps climbing at 21% to the top. About 28% of the way is steeper than 1 in 5, so expect hands-on-knees going and a slow descent.
South-west ridge from Ogwen and Carneddau ridge at a glance
| Distance | 6.5 km one way, to the top |
|---|---|
| Ascent | 940 m |
| Climb on the track | 911 m up, 178 m down on the way |
| Start and top of the track | 296 m to 1,049 m (summit 1,064 m) |
| Steepest 500 m | About 52%, from 0.5 km |
| Steeper than 1 in 5 | 28% of the way |
| Time up | 2h 50m by Naismith's rule |
| There and back | 4h 10m, down the same way |
| Grade | Hard |
| Start | Ogwen Cottage north-side path, LL57 3LZ |
| Start grid reference | SH 650 604 |
| Summit grid reference | SH 683 643 |
| Parking | Llyn Ogwen / Ogwen Centre car park; the postcode is approximate |
South-west ridge from Ogwen and Carneddau ridge map
The track from the start (green) to the summit (blue), with a marker at each kilometre.
Height profile and getting to the start
Near the start
From OpenStreetMap, within 2 km. Check opening times before you rely on them.
Download the South-west ridge from Ogwen and Carneddau ridge GPX
Ascent only: plan your way down. A planning track, not checked on the ground; it doesn't show safe scrambling moves. Track data © OpenStreetMap contributors (ODbL), heights from a terrain model.
South-west ridge from Ogwen and Carneddau ridge kilometre by kilometre
Height, climb and average gradient for each kilometre of the track, with a grid reference at the end of each one to check your position on the map.
| At | Height | Climb | Gradient | Grid ref |
|---|---|---|---|---|
| 1 km | 718 m | +404 m | 40% steep | SH 652 612 |
| 2 km | 949 m | +231 m | 23% steep | SH 655 619 |
| 3 km | 955 m | +6 m | 1% | SH 658 627 |
| 4 km | 968 m | +13 m | 1% | SH 667 630 |
| 5 km | 930 m | -38 m | -4% | SH 676 632 |
| 6 km | 941 m | +11 m | 1% | SH 682 639 |
| 6.5 km | 1,049 m | +108 m | 21% steep | SH 683 643 |
How long the South-west ridge from Ogwen and Carneddau ridge takes
| Pace | To the top | There and back |
|---|---|---|
| Brisk 6 km/h, 8 min per 100 m up | 2h 20m | 3h 25m |
| Steady (Naismith) 5 km/h, 10 min per 100 m up | 2h 50m | 4h 10m |
| Relaxed 4 km/h, 12 min per 100 m up | 3h 30m | 5h 10m |
Times leave out stops. Coming down the same way, the table counts the ascent once; steep descents on rough ground can be as slow as the climb.
- Today: sunrise 07:48, sunset 18:14. Start by 13:04 to be down before dark, allowing 4h 10m for the walk and an hour for stops.
- Tomorrow: sunrise 07:49, sunset 18:11. Start by 13:01 to be down before dark, allowing 4h 10m for the walk and an hour for stops.
Carnedd Llewelyn summit weather for this route
-
Marginal Today Sunday 18 October
Overcast, up to 4°C at the summit, feeling as cold as -5°C, summit wind 25 mph gusting 32 mph, 21% chance of rain. Rated Marginal. Sunrise 07:48, sunset 18:14.
-
Marginal Tomorrow Monday 19 October
Moderate drizzle, up to 5°C at the summit, feeling as cold as -4°C, summit wind 37 mph gusting 47 mph, 73% chance of rain. Rated Marginal. Sunrise 07:49, sunset 18:11.
Best day of the next seven for the South-west ridge from Ogwen and Carneddau ridge: Sunday 18 October, with summit gusts around 32 mph and a 21% chance of rain.
Cloud inversion tomorrow morning: 2% (Low), best around 05:00. 7-day inversion outlook.
Hour-by-hour Carnedd Llewelyn forecast · 14-day forecast · Is it safe to climb Carnedd Llewelyn?
Before you go, also check: MWIS Snowdonia forecast · Met Office mountain forecast.
What to take today
- An insulated jacket, hat and warm gloves: it feels like -5°C on top.
- A waterproof jacket. It can rain on the tops in any forecast.
- A windproof layer, and poles for balance in gusts to 32 mph.
- Microspikes for icy paths. In snow, an ice axe and crampons and the skills to use them.
- Map and compass, and the skills to use them. A phone is a backup, not a plan.
- A head torch, food, water, a charged phone and a small first aid kit.
About Carnedd Llewelyn
Carnedd Llewelyn is the highest summit of the Carneddau, a broad, stony plateau at the centre of Snowdonia's northern range. More about Carnedd Llewelyn, with the live forecast.
On the lists: Furth, Hewitt, Nuttall, Marilyn, county top.
Extend the walk: tops near the summit
- Yr Elen (962 m), 1.2 km north-west
- Foel Grach (975 m), 1.6 km north
- Pen yr Helgi Du (833 m), 1.9 km south-east
- Carnedd Dafydd (1,044 m), 2.5 km south-west
- Garnedd Uchaf (925 m), 2.6 km north
- Foel Meirch (799 m), 2.6 km west
Challenges that include Carnedd Llewelyn
- Welsh 3000s · 15
- Welsh 100 Challenge · 100
- Welsh 1000m Peaks · 5
- Snowdonia 900m Peaks · 16
- Carneddau Traverse · 7
- Paddy Buckley Round · 47
- Furths · 34
- Hewitts · 523
- Nuttalls · 442
- Marilyns · 1,555
More walks from Ogwen Cottage north-side path
Routes in Peakify's guides that start within 500 m of this one, for another day from the same car park.
- South-west ridge from Ogwen and Carneddau ridge up Carnedd Dafydd
- Ogwen via Y Garn and Mynydd Perfedd up Elidir Fawr
- Devil's Kitchen / Twll Du and plateau traverse up Glyder Fach
- Senior's Gully and Ridge and plateau traverse up Glyder Fach
- Y Gribin and plateau traverse up Glyder Fach
- Bristly Ridge up Glyder Fach
- Devil's Kitchen / Twll Du up Glyder Fawr
- Senior's Gully and Ridge up Glyder Fawr
- Y Gribin up Glyder Fawr
- Bristly Ridge and plateau traverse up Glyder Fawr
- South-west ridge from Ogwen up Pen yr Ole Wen
- North East Ridge up Y Garn
Other routes up Carnedd Llewelyn
| Route | Distance | Ascent | Time up | Grade |
|---|---|---|---|---|
| Ogwen via Carnedd Dafydd | 7.4 km one way | 910 m | 3h 0m | Moderate |
| Gerlan via Yr Elen north-west ridge | 6.7 km one way | 890 m | 2h 50m | Hard |
| Cwm Eigiau via the eastern Foel Grach ridge | 12.0 km one way | 830 m | 3h 45m | Hard |
| Rachub via Drosgl and Yr Aryg flanks, via Bera Bach | 9.8 km one way | 830 m | 3h 20m | Hard |
| Bwlch y Ddeufaen via Drum and northern ridge | 11.1 km one way | 840 m | 3h 35m | Hard |
| Llanfairfechan via Drum and northern ridge | 11.7 km one way | 1,000 m | 4h 0m | Hard |
| Abergwyngregyn via Drum via Drum and northern ridge | 11.3 km one way | 960 m | 3h 50m | Hard |
| Ogwen via Pen yr Helgi Du | 8.3 km one way | 879 m | 3h 10m | Scramble |
| East Ridge via Ffynnon Lloer and Carneddau ridge | 7.4 km one way | 920 m | 3h 0m | Scramble |
| Crib Lem / Llech Ddu Spur and Carnedd Dafydd | 9.2 km one way | 1,000 m | 3h 30m | Scramble |
| Cwm Llugwy and Craig yr Ysfa | 5.0 km one way | 780 m | 2h 20m | Scramble |
| Cwm Eigiau via Bwlch Eryl Farchog and Craig yr Ysfa | 9.7 km one way | 930 m | 3h 30m | Scramble |
In an emergency
Call 999, ask for the police and then mountain rescue. Give your location (the start is at SH 650 604, the summit at SH 683 643), what happened and how many are in your group. If you have no signal for a call, a text to 999 works once you have registered your phone with emergencySMS: text "register" to 999 before you go.
South-west ridge from Ogwen and Carneddau ridge: questions and answers
How far is the South-west ridge from Ogwen and Carneddau ridge?
The South-west ridge from Ogwen and Carneddau ridge is 6.5 km one way to the summit of Carnedd Llewelyn, with 940 m of ascent. There and back by the same way is about 13.0 km.
How long does the South-west ridge from Ogwen and Carneddau ridge take?
About 2h 50m to the summit of Carnedd Llewelyn and 4h 10m there and back by Naismith's rule (5 km/h plus 10 minutes per 100 m of ascent), before stops. A relaxed group takes nearer 5h 10m for the round trip.
How steep is the South-west ridge from Ogwen and Carneddau ridge?
The steepest 500 m averages about 52%, starting 0.5 km from the start, and 28% of the way is steeper than 1 in 5. The South-west ridge from Ogwen and Carneddau ridge climbs 911 m in all on the track.
Where do you park for the South-west ridge from Ogwen and Carneddau ridge?
The South-west ridge from Ogwen and Carneddau ridge starts from Ogwen Cottage north-side path (postcode LL57 3LZ). The grid reference is SH 650 604. Llyn Ogwen / Ogwen Centre car park; the postcode is approximate
Is the South-west ridge from Ogwen and Carneddau ridge suitable for beginners?
Not as a first mountain. Peakify grades it Hard: steep, rough ground where a slip matters. Build up on an easier route first, such as Ogwen via Carnedd Dafydd.
What time should I start the South-west ridge from Ogwen and Carneddau ridge today?
By 13:04 at the latest. Sunset on Carnedd Llewelyn today is 18:14, The South-west ridge from Ogwen and Carneddau ridge takes about 4h 10m there and back, and that leaves an hour for stops. Start earlier in winter or if the forecast turns.
Is there a GPX for the South-west ridge from Ogwen and Carneddau ridge?
Yes. Download it from this page. It is an ascent-only planning track from the start to the summit, plotted on OpenStreetMap paths and not checked on the ground.