Llyn Cowlyd and the Crafnant valley loop
Llyn Cowlyd and the Crafnant valley loop
4.2
(13)
75
riders
02:36
27.5km
680m
Mountain biking
Tackle the Llyn Cowlyd and Crafnant valley loop, a challenging 17.1-mile mountain biking route in Eryri (Snowdonia) National Park.
Last updated: February 26, 2026
Tips
Includes a very steep uphill segment
You may need to push your bike.
After 21.9 km for 686 m
Waypoints
Start point
Parking
Get Directions
380 m
Highlight (Segment) • Trail
Tip by
7.17 km
Highlight (Segment) • Trail
Tip by
22.5 km
Highlight • Climb
Tip by
24.6 km
Highlight (Segment) • Trail
Tip by
26.5 km
Highlight • Cafe
Tip by
27.5 km
End point
Parking
Way Types & Surfaces
Way Types
12.7 km
9.87 km
2.81 km
1.70 km
417 m
Surfaces
15.4 km
9.87 km
1.86 km
272 m
104 m
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Elevation
Highest point (420 m)
Lowest point (50 m)
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Weather
Powered by Foreca
Thursday 7 May
13°C
3°C
32 %
Additional weather tips
Max wind speed: 20.0 km/h
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This route was planned by komoot.
This route is considered challenging and requires good fitness and advanced riding skills. While komoot rates it as 'moderate', be prepared for technical singletrack, significant climbs, and sections that may require 'hike-a-bike' due to boggy ground or steep, rocky terrain. It's a true mountain adventure, not a trail center ride.
The terrain is highly varied and often technical. You'll encounter a mix of surfaces including technical singletrack, particularly along Llyn Cowlyd, which can be tricky. There are sections of boggy ground, stiff road climbs, steady road climbs into the Llyn Crafnant Valley, and challenging grassy climbs. Descents can be rocky, rough, and require careful navigation, especially when rocks are slippery in wet conditions. Expect some tarmac country lanes and forest roads too.
The route often starts and finishes near the Moel Siabod Café in Capel Curig. This is a popular spot, so arriving early is advisable, especially during peak season, to secure parking.
No, there are no specific permits or entrance fees required to access and mountain bike on public rights of way within Eryri (Snowdonia) National Park. However, always respect the countryside code and any local signage.
The best time to ride this loop is during drier periods, typically late spring, summer, and early autumn. Wet conditions can make the already technical and rocky sections very slippery and increase the likelihood of boggy ground, making the ride significantly harder and less enjoyable. The scenery is stunning year-round, but for riding, aim for dry weather.
Yes, dogs are generally welcome on this route, but they must be kept under close control, preferably on a lead, especially around livestock and ground-nesting birds. Remember to clean up after your dog and ensure they are fit enough for a challenging, long ride.
You'll be immersed in dramatic and stunning Welsh mountain scenery. The route offers magnificent views around the iconic lakes of Llyn Cowlyd and Llyn Crafnant, nestled amidst majestic mountains and picturesque valleys. You'll also get views towards Tryfan and the Glyder range, experiencing a wild and remote feel away from the crowds.
Yes, the route also passes through sections of the Snowdonia Slate Trail, Llwybr yr Arweinydd, and Pont y Bedol.
Absolutely! The route features several highlights including the Ogwen Valley Byway (Eastern Section), the Llyn Cowlyd Bridleway, and a View of Llyn Crafnant from the Col Beside Crimpiau. You'll also experience the rewarding Crimpiau Singletrack Descent. For post-ride refreshments, the Siabod Cafe is a popular spot near the start/finish.
Given the challenging and remote nature of the trail, it's essential to be well-prepared. Bring plenty of water and snacks, appropriate mountain biking gear, a repair kit, and navigation tools (a 1:25,000 map is recommended as navigation can be awkward in places). Layered clothing is wise, as weather in the mountains can change quickly. A first-aid kit is also highly advisable.
No, this route is not recommended for families with young children or beginner mountain bikers. Its challenging terrain, significant elevation gain, and technical sections require advanced skills and good physical fitness. There are more suitable, less demanding trails in Eryri (Snowdonia) National Park for those new to mountain biking or riding with family.
This trail is very technical in places, and if it was in a bike park, it would be graded black definitely not for the beginner.