5.0
(2)
90
hikers
9
hikes
Mountaineering around Llyn Eigiau is characterized by its location within a dramatic glaciated valley on the fringes of the Carneddau mountain range in Snowdonia National Park. This area features rugged terrain and challenging ascents to prominent peaks like Carnedd Llewelyn, Wales' second-highest mountain. The landscape is defined by high, remote mountains, crags, and ridges, offering a true wilderness experience for mountaineers.
Last updated: June 24, 2026
9
hikers
8.69km
03:50
580m
580m
Hard mountaineering route. Good fitness required. Sure-footedness, sturdy shoes and alpine experience required.
2
hikers
8.15km
02:20
180m
180m
Moderate mountaineering route. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

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5.0
(1)
24
hikers
7.22km
03:10
580m
580m
Hard mountaineering route. Good fitness required. Sure-footedness, sturdy shoes and alpine experience required.
36
hikers
6.74km
03:34
610m
610m
Hard mountaineering route. Good fitness required. Sure-footedness, sturdy shoes and alpine experience required.
5.0
(1)
10
hikers
3.80km
02:44
550m
550m
Hard mountaineering route. Good fitness required. Sure-footedness, sturdy shoes and alpine experience required.
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Huge angled boulder that you can see from the valley below. It can be climbed with care, but is polished these days.
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Rhaeadr Idwal is the scenic waterfall formed as the outflow of Llyn Idwal tumbles toward the Ogwen Valley. Cascading over ancient volcanic rock, it is a highlight of the approach path from Ogwen Cottage. Nearby, the Devilโs Appendix plunges 93 meters down the cliffs of Twll Du, making it the tallest single-drop waterfall in Wales. These falls are most dramatic after heavy rain or when frozen into spectacular ice columns in winter.
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Llyn Ogwen is a wonderful place - just avoid it at all costs on Bank Holiday weekends!!
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See this write up - https://www.komoot.com/tour/2449300285 It explains why this route is so good.
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This route is so much fun - and is part of what is probably the best grade 1 scramble in Snowdonia.
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The south ridge is the easier way to reach the top of Tryfan, but it still has it's moments near the top.
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There are over 20 mountaineering routes around Llyn Eigiau, catering to various skill levels. You'll find 4 moderate routes and 18 difficult routes, offering plenty of options for exploration.
Mountaineering around Llyn Eigiau is characterized by its rugged, glaciated valley terrain and the high Carneddau mountains. Routes often involve significant elevation gain and can be quite challenging. Many are classified as 'difficult', requiring very good fitness, sure-footedness, and sturdy gear. Some routes, like the ascent from Bwlch Eryl Farchog, may even include light scrambling sections.
While many routes are challenging, there are a few moderate options available. For instance, the View of the Carneddau Range โ Llyn Geirionydd loop from Trefriw is a moderate 5.1-mile trail that offers views of the Carneddau without the extreme difficulty of some other ascents. It's a good way to experience the area's beauty.
For experienced mountaineers seeking a challenge, routes like the Llyn-y-Foel โ Moel Siabod Summit loop from Capel Curig offer significant elevation gain and panoramic summit views. Another demanding option is the Tryfan Scramble โ Tryfan Summit loop from Capel Curig, which involves scrambling sections to the rugged summit of Tryfan. The Cwm Eigiau Horseshoe is also a classic high-level walk traversing several prominent peaks.
The area is rich in dramatic natural features. You can encounter prominent peaks like Carnedd Llewelyn (Wales' second-highest mountain), Foel Grach with its mountain refuge, and Craig Eigiau with its distinctive tilted slab. Beyond Llyn Eigiau itself, you might also discover remote bodies of water such as Llyn Melynllyn and Dulyn Reservoir. The remains of the breached dam at Llyn Eigiau also serve as a poignant historical landmark.
Many routes in Snowdonia National Park are dog-friendly, but it's crucial to keep dogs under close control, especially in areas with livestock or ground-nesting birds. Some challenging routes with scrambling sections might not be suitable for all dogs. Always check local signage and be prepared to keep your dog on a lead.
While many routes are demanding, families with older, experienced children might enjoy some of the moderate trails. The glaciated valley offers a dramatic backdrop, but ensure your family has good fitness and appropriate gear for the terrain. For younger children, gentler walks might be more suitable than full mountaineering ascents.
Yes, many of the mountaineering routes around Llyn Eigiau are designed as loops, allowing you to start and finish at the same point. Examples include the Llyn-y-Foel โ Moel Siabod Summit loop from Capel Curig and the Tryfan Scramble โ Tryfan Summit loop from Capel Curig. The Cwm Eigiau Horseshoe is also a classic circular high-level walk.
The best time for mountaineering in Llyn Eigiau is typically from late spring to early autumn (May to October) when the weather is generally more stable, and daylight hours are longer. However, the Carneddau can experience rapid weather changes, so always be prepared for all conditions, even in summer. Winter mountaineering is possible but requires significant experience, specialist equipment, and an understanding of avalanche risks.
Parking is generally available at key access points around the Llyn Eigiau area, often near trailheads or villages like Capel Curig and Trefriw, which serve as starting points for many routes. Specific parking details can vary by trailhead, so it's advisable to check the route description for the exact starting point you plan to use.
Public transport options to the more remote trailheads around Llyn Eigiau can be limited. However, villages like Capel Curig and Trefriw, which serve as starting points for some routes, are generally better connected by local bus services within Snowdonia National Park. Planning your journey in advance is recommended if relying on public transport.
The Llyn Eigiau area is highly rated by the komoot community, with an average score of 4.8 stars from more than 20 reviews. Mountaineers often praise the area for its true wilderness experience, the dramatic glaciated valleys, and the challenging ascents to prominent, remote peaks, offering a sense of solitude compared to other parts of Snowdonia.
Yes, the eastern approaches to the Carneddau from Llyn Eigiau are notably less trodden than other popular areas of Snowdonia, such as the Glyderau or Snowdon itself. This makes it an excellent choice if you're seeking a greater sense of wilderness and solitude during your mountaineering adventures.
While Llyn Eigiau itself is quite remote, nearby villages like Capel Curig and Trefriw offer options for pubs, cafes, and accommodation. These villages serve as common starting or finishing points for many routes, making them convenient for refreshments after a day in the mountains.
Llyn Eigiau and other remote lakes like Llyn Melynllyn and Dulyn Reservoir offer picturesque settings for wild swimming. However, always exercise caution, be aware of water temperatures, potential currents, and submerged hazards. Respect the natural environment and ensure you leave no trace.


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