Crib Lem / Llech Ddu Spur and Carnedd Dafydd 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 grade 1 scramble to the summit from Gerlan public footpath.
Crib Lem / Llech Ddu Spur and Carnedd Dafydd starts at about 282 m and gains 981 m over 9.2 km to 1,049 m on the track. The first 5 km are the easy part, averaging 5%. The steepest kilometre is the one ending at 6 km, which climbs 460 m at an average of 46%, with a 500 m stretch from 5.5 km at about 59%. It keeps climbing at 15% to the top. About 15% of the way is steeper than 1 in 5, so expect hands-on-knees going and a slow descent.
Crib Lem / Llech Ddu Spur and Carnedd Dafydd at a glance
| Distance | 9.2 km one way, to the top |
|---|---|
| Ascent | 1,000 m |
| Climb on the track | 981 m up, 217 m down on the way |
| Start and top of the track | 214 m to 1,049 m (summit 1,064 m) |
| Steepest 500 m | About 59%, from 5.5 km |
| Steeper than 1 in 5 | 15% of the way |
| Time up | 3h 30m by Naismith's rule |
| There and back | 5h 20m, down the same way |
| Grade | Scramble |
| Start | Gerlan public footpath |
| Start grid reference | SH 638 663 |
| Summit grid reference | SH 683 643 |
| Parking | No checked car park for this start; find lawful parking nearby |
Crib Lem / Llech Ddu Spur and Carnedd Dafydd 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
- Douglas Arms1.4 km
- Cwrw Tŷ Mo1.6 km
- Y Sior1.6 km
- Caffi Seren1.6 km
- Coed y Brenin1.7 km
- Public toilets1.7 km
- Ogwen Bank Holiday Park & Country Club1.4 km
From OpenStreetMap, within 2 km. Check opening times before you rely on them.
Download the Crib Lem / Llech Ddu Spur and Carnedd Dafydd 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.
Crib Lem / Llech Ddu Spur and Carnedd Dafydd 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 | 230 m | -52 m | -5% | SH 636 660 |
| 2 km | 328 m | +98 m | 10% | SH 643 655 |
| 3 km | 420 m | +91 m | 9% | SH 652 651 |
| 4 km | 447 m | +27 m | 3% | SH 659 644 |
| 5 km | 539 m | +93 m | 9% | SH 664 637 |
| 6 km | 999 m | +460 m | 46% steep | SH 664 631 |
| 7 km | 959 m | -40 m | -4% | SH 670 630 |
| 8 km | 909 m | -50 m | -5% | SH 679 634 |
| 9 km | 1,023 m | +114 m | 11% | SH 683 642 |
| 9.2 km | 1,049 m | +26 m | 15% | SH 683 643 |
How long Crib Lem / Llech Ddu Spur and Carnedd Dafydd takes
| Pace | To the top | There and back |
|---|---|---|
| Brisk 6 km/h, 8 min per 100 m up | 2h 50m | 4h 25m |
| Steady (Naismith) 5 km/h, 10 min per 100 m up | 3h 30m | 5h 20m |
| Relaxed 4 km/h, 12 min per 100 m up | 4h 20m | 6h 35m |
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 11:54 to be down before dark, allowing 5h 20m for the walk and an hour for stops.
- Tomorrow: sunrise 07:49, sunset 18:11. Start by 11:51 to be down before dark, allowing 5h 20m 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 Crib Lem / Llech Ddu Spur and Carnedd Dafydd: 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 Gerlan public footpath
Routes in Peakify's guides that start within 500 m of this one, for another day from the same car park.
- Crib Lem / Llech Ddu Spur up Carnedd Dafydd
- Gerlan via Yr Elen north-west ridge up Yr Elen
- Gerlan via Yr Elen and the high Carneddau up Foel Meirch
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 |
| South-west ridge from Ogwen and Carneddau ridge | 6.5 km one way | 940 m | 2h 50m | Hard |
| 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 |
| 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 638 663, 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.
Crib Lem / Llech Ddu Spur and Carnedd Dafydd: questions and answers
How far is Crib Lem / Llech Ddu Spur and Carnedd Dafydd?
Crib Lem / Llech Ddu Spur and Carnedd Dafydd is 9.2 km one way to the summit of Carnedd Llewelyn, with 1,000 m of ascent. There and back by the same way is about 18.4 km.
How long does Crib Lem / Llech Ddu Spur and Carnedd Dafydd take?
About 3h 30m to the summit of Carnedd Llewelyn and 5h 20m 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 6h 35m for the round trip.
How steep is Crib Lem / Llech Ddu Spur and Carnedd Dafydd?
The steepest 500 m averages about 59%, starting 5.5 km from the start, and 15% of the way is steeper than 1 in 5. Crib Lem / Llech Ddu Spur and Carnedd Dafydd climbs 981 m in all on the track.
Where do you park for Crib Lem / Llech Ddu Spur and Carnedd Dafydd?
Crib Lem / Llech Ddu Spur and Carnedd Dafydd starts from Gerlan public footpath. The grid reference is SH 638 663. No checked car park for this start; find lawful parking nearby
Is Crib Lem / Llech Ddu Spur and Carnedd Dafydd suitable for beginners?
No. It is a scramble: you use your hands on rock, often with big drops below. Go with someone experienced, on a dry and calm day, or take Ogwen via Carnedd Dafydd instead.
What time should I start Crib Lem / Llech Ddu Spur and Carnedd Dafydd today?
By 11:54 at the latest. Sunset on Carnedd Llewelyn today is 18:14, Crib Lem / Llech Ddu Spur and Carnedd Dafydd takes about 5h 20m there and back, and that leaves an hour for stops. Start earlier in winter or if the forecast turns.
Is there a GPX for Crib Lem / Llech Ddu Spur and Carnedd Dafydd?
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.