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Routes
Mountain biking trails
United Kingdom
Wales
North Wales
Conwy
Capel Curig

Llyn Cowlyd and the Crafnant valley loop

Moderate

4.2

(13)

75

riders

Llyn Cowlyd and the Crafnant valley loop

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

A

Start point

Parking

Get Directions

1

380 m

Ogwen Valley Byway (Eastern Section)

Highlight (Segment) • Trail

Blue grade double track leading you from Capel Curig into the Ogwen valley. Classic views of Tryfan and the Carneddau await. After heavy rain it can become a bit muddy in places.

Tip by

2

7.17 km

Llyn Cowlyd Bridleway

Highlight (Segment) • Trail

Loads of absorbing bog, in mid August!

Tip by

3

22.5 km

A challenging but definitely worth it climb up from the A5 some tricky sections that may result in a hike a bike.

Tip by

4

24.6 km

Crimpiau Singletrack Descent

Highlight (Segment) • Trail

Technical rocky single track leads you down from the footbridge in the mountains towards the village of Capel Curig. With only one small section of hike a bike required by most users, it feels hard for a red grade route.

Tip by

5

26.5 km

Siabod Cafe

Highlight • Cafe

This cafe has won many awards.
Unfortunately the have now closed this site from 8th January 2024.
Gutted.

Tip by

B

27.5 km

End point

Parking

Loading

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

Elevation

Nothing selected – click and drag below to see the stats for a specific part of the route.

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

to get more detailed weather forecasts along your route

This route was planned by komoot.

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Frequently Asked Questions

How challenging is the Llyn Cowlyd and Crafnant valley loop for mountain biking?

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.

What is the terrain like on this mountain bike loop?

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.

Where can I park to access the Llyn Cowlyd and Crafnant valley loop?

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.

Are there any permits or entrance fees required for mountain biking in Eryri (Snowdonia) National Park?

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.

What is the best time of year to mountain bike this route?

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.

Is the Llyn Cowlyd and Crafnant valley loop dog-friendly?

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.

What kind of scenery can I expect on the trail?

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.

Does the trail intersect other well-known paths?

Yes, the route also passes through sections of the Snowdonia Slate Trail, Llwybr yr Arweinydd, and Pont y Bedol.

Are there any notable points of interest or highlights along the way?

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.

What should I bring for a mountain bike ride on this loop?

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.

Is this route suitable for families or beginners?

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.

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Trail Reviews

Paul Harvey
January 30, 2022, capel curig to llyn cowlyd clockwise

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.

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