Carnedd Dafydd & Carnedd Llewelyn loop from the Ogwen Valley

The most common starting point for this loop is from the Ogwen Valley. You can find parking at the Ogwen Visitor Centre and Snack Bar. Arriving early, especially on weekends or during peak season, is highly recommended as parking spaces can fill up quickly.

While the route is categorized for jogging with an estimated duration of just under 3 hours, for most people, especially considering its 'difficult' grade and challenging terrain, it will take significantly longer. Expect a strenuous walk lasting 6-8 hours, depending on your fitness level, weather conditions, and how often you stop to enjoy the views.

The terrain is diverse and very challenging. You'll encounter significant rocky sections, loose scree, and potentially boggy ground. There are several scrambles, particularly on the ascent to Pen yr Ole Wen and the descent from Carnedd Llewelyn Summit. Paths can be faint along ridges, requiring good route-finding skills, especially in poor visibility. Sturdy shoes and sure-footedness are essential.

This loop offers spectacular panoramic views. You'll pass two of Wales' highest peaks, Carnedd Dafydd and Carnedd Llewelyn Summit. Highlights include breathtaking vistas over Cwm Lloer and Ffynnon Lloer, as well as views of the Glyderau, Tryfan, Anglesey, and the Ffynnon Llugwy lake and reservoir from the summits.

While dogs are generally allowed on trails in Snowdonia National Park, this particular route is very challenging due to scrambles, steep rocky sections, and loose scree. It may not be suitable for all dogs, especially those not accustomed to strenuous mountain terrain. Always keep dogs on a leash, especially near livestock and ground-nesting birds, and be prepared to carry them over difficult sections if necessary.

The best time to tackle this challenging loop is during late spring, summer, or early autumn (May to October) when weather conditions are generally more stable and daylight hours are longer. Avoid winter months unless you have significant winter mountaineering experience, as conditions can be extremely harsh with snow, ice, and rapidly changing weather.

No, you do not need a permit to hike or jog this loop, and there is no entrance fee for Snowdonia National Park itself. However, standard parking fees apply at the Ogwen Visitor Centre and Snack Bar. Please respect the 'leave no trace' principles and follow the Countryside Code.

No, this loop is explicitly rated as 'difficult' and is considered a 'hard run' or 'strenuous walk'. It requires very good fitness, sure-footedness, and experience with mountain terrain and scrambling. It is not suitable for beginners, young children, or families looking for a casual outing.

Yes, sections of this route overlap with several other notable paths. You will find it intersects with parts of the Cambrian Way, the Welsh Three Thousands, and the Snowdonia Slate Trail. Smaller sections also coincide with the Llyn Ogwen Circular Walk and the National Cycle Network National Route 82.

Given the route's difficulty and exposure, essential gear includes sturdy hiking boots with good ankle support, waterproof and windproof layers, a map and compass (and the ability to use them), sufficient food and water, a headlamp, a first-aid kit, and a fully charged phone. Trekking poles can be helpful on steep ascents and descents.

Be prepared for rapid weather changes; conditions can shift quickly from clear to fog, rain, or strong winds. Good navigation skills are crucial, especially in poor visibility, as some paths are faint. The scrambles, particularly on the ascent to Pen yr Ole Wen and the descent from Carnedd Llewelyn, require careful footing. Starting early allows ample time to complete the loop before dark and secure parking.

Yes, the Ogwen Visitor Centre and Snack Bar is located right at the trailhead, offering basic facilities and refreshments. For more options, the nearby villages of Bethesda and Capel Curig have pubs, cafes, and accommodation.