4.8
(36)
383
riders
26
rides
Gravel biking in Gwynedd offers a compelling blend of rugged landscapes and a diverse network of trails. The region is dominated by Snowdonia National Park, featuring towering mountains, dramatic valleys, and numerous glacial lakes. Extensive forested areas like Coed y Brenin Forest Park and Beddgelert Forest provide prime locations for off-road cycling. Gwynedd's coastline along the Llŷn Peninsula and estuaries like the Mawddach Estuary offer contrasting scenery, while former industrial sites provide unique networks of tracks.
Last updated: July 24, 2026
4.0
(1)
14
riders
39.9km
03:49
990m
990m
Embark on a challenging gravel biking adventure with the Cregennan Lakes and Mawddach Trail loop from Barmouth. This difficult route spans 24.8 miles (39.9 km) and features a significant 3247 feet (990 metres) of elevation gain, typically taking around 3 hours and 48 minutes to complete. You will experience a dramatic contrast between the flat, well-maintained Mawddach Trail, which follows an old railway line along the estuary, and the demanding climbs towards the beautiful Cregennan Lakes, nestled north of Cadair Idris. Expect varied terrain, from smooth gravel to rougher, unpaved sections with large holes and rocky parts as you ascend.
While the Mawddach Trail portion is accessible to all skill levels, the climb to Cregennan Lakes requires very good fitness. Some gradients can be steep, reaching up to 20% or even 30% in places, and you might encounter technical sections where pushing your bike is necessary. It is often recommended to cycle this loop clockwise, as the ascent to the lakes is more gradual in that direction. Make sure your tires are at least 700x40c to handle the rougher segments near the top.
This route is notable for its stunning scenery, offering panoramic views across the Mawddach Estuary, the picturesque Cregennan Lakes, and the grand Cadair Idris range. On a clear day, you can even see the mountains of Snowdonia and the sea from the lake summit. The Mawddach Trail itself has historical significance, following an old railway line and crossing the Barmouth Bridge, which is the longest timber viaduct in Wales. The Cregennan Lakes are owned by the National Trust and are free to visit.
5.0
(3)
22
riders
15.1km
00:59
50m
50m
Easy gravel ride. Great for any fitness level. Mostly paved surfaces. Suitable for all skill levels.

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5.0
(4)
25
riders
20.1km
01:24
380m
380m
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
5.0
(2)
15
riders
69.5km
05:09
1,490m
1,490m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
5.0
(1)
24
riders
68.0km
05:43
1,760m
1,760m
Hard gravel ride. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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Popular around Gwynedd

Traffic-free bike rides in Snowdonia

Traffic-free bike rides around Dyfi Forest
Traffic-free bike rides around Coed Maesgwm

Traffic-free bike rides around Coed Tyglas
Traffic-free bike rides around Dolgellau
Traffic-free bike rides around Rhinog National Nature Reserve
Traffic-free bike rides around Ganllwyd
Traffic-free bike rides around Llyn Cwellyn
Traffic-free bike rides around Llyn Cwm Bychan
Traffic-free bike rides around Llyn Trawsfynydd
Through the forest run many paths, wide gravel paths but also narrow paths between the trees.
8
0
Slightly above Llyn Llewelyn you have a nice view of Snowdon and the surrounding peaks. Enjoy this beautiful view.
8
0
Llyn Llywelyn is a small shallow mountain lake surrounded by open moorland and forests. It is a natural spot to pause, picnic and soak up the serene atmosphere before continuing your walk.
8
0
The path along the lake is very nice. Part of it is actually a kind of dam you walk on, with a barrier on both sides so you have to stay on the path. Because the dam is elevated, you have a good view of the lake and the surroundings.
9
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Stop, look out and listen are the recommendations (to be read on the sign) that you must follow when crossing the track here. It is an unguarded crossing on this railway for tourist trains.
9
0
If you smile sweetly you don’t have to pay. There are also public toilets just after this.
0
0
Lovely lunch spot with picnic benches at the waterside
0
0
First, a somewhat adventurous ride on the single track to the parking lot, which costs £5. The easy loop around the lake is very beautiful and relaxing – the sheep roam freely, but they keep their distance. Dogs must be on a leash, of course, but that's not a problem. Enjoy it – and if you're up for more, go for a longer loop. There are a few tables and benches above the parking lot for your picnic. You won't find any litter baskets, so you'll have to take them with you – which is perfectly fine, as it's a nature reserve. Highly recommended.
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0
Gwynedd offers a diverse selection of over 25 traffic-free gravel bike trails. These routes cater to various skill levels, from easy, family-friendly paths to challenging, long-distance adventures through mountainous terrain.
You'll find a mix of surfaces, predominantly hard-packed tracks, forest roads, and some narrower sections. Many routes utilize former railway lines, offering smooth, level riding, while others venture into more rugged, rocky areas within Snowdonia National Park. The region's gravel roads are often rocky rather than muddy, making them suitable for year-round riding.
Yes, Gwynedd has several easy options perfect for beginners or those seeking a relaxed ride. The Mawddach Trail is an excellent choice, following a disused railway line for 15 km between Dolgellau and Barmouth, offering spectacular estuary views. There are 6 easy routes in total.
For experienced riders seeking a challenge, Gwynedd delivers. Consider the Cregennan Lakes and the Mawddach Trail loop from Barmouth, which includes significant climbs and descents over nearly 40 km. Another demanding option is the Black Road Gravel Pass – Cregennan Lakes loop from Esgairgeiliog Ceinws, a difficult 69 km route with over 1400m of elevation gain. There are 16 difficult routes available.
Absolutely. Many of Gwynedd's traffic-free gravel trails are designed as loops, allowing you to start and finish in the same location. Examples include the Beddgelert Stone Bridge – Llyn Llywelyn loop from Beddgelert, a moderate 20 km ride, and the Beddgelert Forest Trail – View of Snowdon loop from Beddgelert, a 12 km moderate option.
Gwynedd's trails often pass by stunning natural and historical sites. You might encounter dramatic waterfalls like Aber Falls or Rhaeadr Ddu (Black Falls) Waterfalls. Historical sites such as Caernarfon Castle or Dolbadarn Castle are also within reach of some routes, offering a glimpse into the region's rich past.
Yes, Gwynedd is very family-friendly, especially with its network of traffic-free routes. The Lonydd Glas (Recreational Routes), often built on old railway lines, provide safe and scenic options. The Mawddach Trail is particularly popular for families due to its flat profile and stunning views.
Generally, dogs are welcome on many of Gwynedd's public trails, including gravel routes, but specific rules can vary by location, especially within Snowdonia National Park or private forest lands. It's always best to keep dogs on a lead, especially near livestock or in nature conservation areas, and to check local signage for any restrictions.
Gwynedd offers good gravel biking conditions year-round due to its often rocky, well-draining surfaces. However, spring and autumn provide the most pleasant temperatures and stunning scenery, with fewer crowds than peak summer. Winter riding is possible, but be prepared for colder, wetter weather and shorter daylight hours, especially in higher elevations.
Many key trailheads and routes in Gwynedd, such as sections of the Mawddach Trail and routes around Beddgelert, are accessible by public transport, including local bus services and some railway lines. This allows for point-to-point rides or easier access without a car. It's advisable to check specific transport schedules and bike carriage policies in advance.
The komoot community highly rates gravel biking in Gwynedd, with an average score of 4.9 stars. Reviewers often praise the region's breathtaking natural beauty, the tranquility of the traffic-free paths, and the variety of terrain that caters to all skill levels. The stunning views of Snowdonia, the coast, and the historic sites are frequently highlighted as major draws.


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