Lôn Eifion and Lôn Gwyrfai Loop
Lôn Eifion and Lôn Gwyrfai Loop
5.0
(7)
50
riders
Lôn Eifion and Lôn Gwyrfai Loop
02:29
40.1km
370m
Cycling
This moderate touring bicycle loop takes you through diverse landscapes, covering 24.9 miles (40.1 km) with an elevation gain of 1229 feet (375 metres). You can expect a varied ride, blending smooth, traffic-free paths with quiet country lanes. The Lôn Eifion section offers expansive views across the Llŷn Peninsula and Caernarfon Bay. As you transition to Lôn Gwyrfai, the route leads you through the Gwyrfai Valley, providing vistas of Yr Wyddfa (Snowdon) and passing the ecologically valuable Llyn y Gadair lake. The entire journey typically takes around 2 hours and 29 minutes to complete.
While the Lôn Eifion section is well-surfaced and largely traffic-free, be prepared for varied terrain on the Lôn Gwyrfai path, which includes crushed slate and gravel, along with some steeper sections. For the most comfortable experience on this route, a hybrid or mountain bike is recommended over a road bike. You will also encounter some on-road sections that connect the two main trails.
This route offers a unique opportunity to explore Eryri / Snowdonia National Park by bike, combining coastal views with mountain scenery. Keep an eye out for steam trains along the Welsh Highland Railway, which you can glimpse at various points. The blend of dedicated paths and quiet lanes makes this loop a rewarding way to experience the region's natural beauty and historical transport.
Last updated: April 23, 2026
Tips
Your route passes through protected areas
Please check local regulations for:
Waypoints
Start point
Parking
Get Directions
16.8 km
Caernarfon Castle
Highlight • Castle
Tip by
20.8 km
Welsh Highland Railway Steam Locomotives and Station
Highlight (Segment) • Monument
Translated by Google •
Tip by
37.1 km
Drws Y Coed Climb
Highlight • Viewpoint
Whilst it is a stiff climb in places the scenery is fabulous all the way from Nantlle passing the peaks of the iconic Nantlle ridge, including Mynydd Drws Y Coed itself. This is a ride not to be missed.
Tip by
40.1 km
End point
Parking
Way Types & Surfaces
Way Types
16.1 km
12.6 km
10.9 km
467 m
Surfaces
27.1 km
12.6 km
287 m
< 100 m
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Elevation
Highest point (240 m)
Lowest point (10 m)
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Weather
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Tuesday 12 May
9°C
4°C
57 %
Additional weather tips
Max wind speed: 24.0 km/h
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This route was planned by komoot.
Frequently Asked Questions
How challenging is the Lôn Eifion and Lôn Gwyrfai Loop for touring cyclists?
This loop is generally considered moderate. While Lôn Eifion is largely easy and traffic-free with a gradual climb, connecting to Lôn Gwyrfai involves some country lanes and potentially steeper sections. Lôn Gwyrfai itself is categorized as easy to moderate, with varied surfaces. The full loop, around 40 km, requires a reasonable level of fitness.
What kind of terrain can I expect on this cycling loop?
The terrain varies. Lôn Eifion offers an excellent hard, tarmacked surface, following a disused railway line. Lôn Gwyrfai features a mix of crushed slate, gravel, and tarmac, with some undulating and steeper sections. The connecting routes between the two main trails will be on country lanes, which may have varying surfaces and some climbs. A hybrid or mountain bike would be comfortable for the varied surfaces.
Where are the best places to park and access the Lôn Eifion and Lôn Gwyrfai Loop?
You can start the loop from Caernarfon, where parking is available, often near Caernarfon Castle. Other access points include Rhyd Ddu or Beddgelert, which also offer parking options. Starting from Caernarfon allows you to begin on the well-surfaced Lôn Eifion section.
What are the main points of interest and scenic views along the route?
The loop offers diverse scenery. You'll pass by Caernarfon Castle, enjoy views of the Llŷn Peninsula, Caernarfon Bay, and Anglesey, and see the mountains of Eryri (Snowdonia). You might also spot steam trains along the Welsh Highland Railway, pass through Beddgelert Forest, and see Llyn y Gadair lake. The Drws Y Coed Climb offers fantastic viewpoints.
Is the Lôn Eifion and Lôn Gwyrfai Loop suitable for families and beginner cyclists?
The Lôn Eifion section is largely traffic-free and well-surfaced, making it ideal for families and beginners. However, the full loop, which combines Lôn Eifion with Lôn Gwyrfai via country lanes, includes some climbs and varied terrain that might be more challenging for very young children or absolute beginners. Consider cycling just the Lôn Eifion section for an easier family-friendly ride.
What is the best time of year to cycle this loop?
The best time to cycle is typically from late spring to early autumn (May to September) when the weather is generally milder and drier. This allows for better enjoyment of the scenic views and more comfortable cycling conditions. Always check the local weather forecast before you go, as conditions in Eryri (Snowdonia) can change rapidly.
Are dogs allowed on the Lôn Eifion and Lôn Gwyrfai Loop?
Yes, dogs are generally allowed on these trails, but they must be kept under close control, preferably on a leash, especially when passing through farmland with livestock or in busy areas. Please ensure you clean up after your dog to help keep the trails pleasant for everyone.
Do I need a permit or pay an entrance fee to cycle in Eryri (Snowdonia) National Park?
No, there are no specific permits or entrance fees required to cycle the Lôn Eifion and Lôn Gwyrfai Loop or to enter Eryri (Snowdonia) National Park. However, some car parks may charge a fee, so be prepared for that.
Does this cycling loop intersect with other well-known paths?
Yes, the route incorporates significant sections of the Lôn Eifion and Lôn Gwyrfai trails. It also briefly crosses parts of the EuroVelo 2 - Capitals Route - part United Kingdom 1, Lôn Las Cymru (North), and the Snowdonia Slate Trail.
Are there any facilities like cafes or bike hire along the route?
Yes, you'll find facilities in towns like Caernarfon and Beddgelert. Beddgelert, in particular, is known to have bike hire facilities, which can be useful if you don't bring your own or wish to vary your route. There are also opportunities for refreshments in these villages.
What's an insider tip for making the most of this cycling loop?
Consider using the Welsh Highland Railway to shorten or vary your loop. You can cycle one section and then take the train with your bike for another part, offering a unique perspective and a chance to rest. This is especially useful if you want to experience both Lôn Eifion and Lôn Gwyrfai without committing to the full distance of the connecting country lanes.