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Routes
Bike touring routes & trails
United Kingdom
Wales
North Wales
Gwynedd
Llanaelhaearn

Bwlch Mawr Loop

Moderate

4.5

(2)

6

riders

Bwlch Mawr Loop

02:20

36.5km

370m

Cycling

Cycle the moderate Bwlch Mawr loop from Trefor, covering 22.7 miles (36.5 km) with stunning views across the Llŷn Peninsula.

Last updated: February 26, 2026

Tips

Your route passes through protected areas

Please check local regulations for:

AHNE Llŷn

Waypoints

A

Start point

Parking

Get Directions

1

909 m

Trefor Beach

Highlight • Viewpoint

Set at the foot of fishing village, Trefor, is a lovely little bay that has clear water and a mountainous backdrop.

Tip by

2

17.5 km

National Cycle Network Route 8

Highlight • Cycleway

3

21.7 km

Bridge Over Afon Dwyryd

Highlight • River

Gravel path up a steep hill. Recommend pushing road bikes.

Tip by

B

36.5 km

End point

Parking

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Way Types & Surfaces

Way Types

20.6 km

14.2 km

924 m

817 m

< 100 m

Surfaces

31.7 km

3.91 km

924 m

< 100 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 (170 m)

Lowest point (20 m)

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Weather

Powered by Foreca

Tuesday 12 May

13°C

7°C

65 %

Additional weather tips

Max wind speed: 39.0 km/h

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This route was planned by komoot.

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Frequently Asked Questions

How challenging is the Bwlch Mawr loop from Trefor for cycling?

This route is rated as a moderate touring bicycle ride. While it's generally accessible, good fitness is required for the approximately 36.5 km (22.7 miles) distance and 370 meters (1,214 feet) of elevation gain. Some moderate routes in the region might include unpaved sections, so be prepared for varied terrain.

What is the terrain like on this cycling route?

The terrain is primarily characterized by mostly paved surfaces, making it suitable for touring bikes. However, as it's a moderate route, some segments might be unpaved and potentially more challenging. The loop circulates the high hills of Bwlch Mawr, Gyrn Goch, and Gyrn Ddu, often utilizing narrow and quiet roads.

What can I see along the Bwlch Mawr loop?

You can expect stunning and dramatic scenery with expansive views across the Llŷn Peninsula. Highlights include incredible vistas of both mountains and the sea, occasionally complemented by bright pink foxgloves. From higher points, you'll get superb views of Snowdonia (Eryri), the Nantlle Ridge, and the coast, including Yr Eifl. You'll also pass by Trefor Beach and cross the Bridge Over Afon Dwyryd.

Where can I park when cycling the Bwlch Mawr loop from Trefor?

While specific parking locations for the Bwlch Mawr loop in Trefor are not detailed, Trefor is a small village on the Llŷn Peninsula. You may find roadside parking or small public car parks within the village. It's always a good idea to arrive early, especially during peak season, to secure a spot.

What is the best time of year to cycle this route?

The Llŷn Peninsula offers beautiful scenery year-round, but for cycling, spring and summer (May to September) generally provide the most pleasant weather conditions. You'll experience longer daylight hours and a higher chance of clear skies for enjoying the expansive views.

Are there any permits or fees required to cycle the Bwlch Mawr loop?

No, there are no specific permits or entrance fees required to cycle the Bwlch Mawr loop. The route is on public roads and paths within the Llŷn Area of Outstanding Natural Beauty (AONB). However, always respect local regulations and private land.

Is the Bwlch Mawr loop from Trefor dog-friendly?

As this is primarily a touring bicycle route utilizing public roads and cycle paths, dogs are generally permitted if kept under control. However, always be mindful of traffic, livestock, and local signage, especially when passing through rural areas or near farms. If you plan to stop at any specific attractions, check their individual dog policies.

Does this cycling route connect with other well-known paths?

Yes, the route intersects with several other paths. Notably, it covers significant sections of the EuroVelo 2 - Capitals Route - part United Kingdom 1, Lôn Las Cymru (North), and Lôn Eifion. It also briefly connects to the National Cycle Network Route 8 and the Llŷn Coastal Path.

What should I know about cycling in the Llŷn Area of Outstanding Natural Beauty (AONB)?

The Bwlch Mawr loop is located within the stunning Llŷn AONB. When cycling here, please respect the natural environment by staying on designated routes, taking all litter home, and being considerate of other users and wildlife. The area is known for its unique landscape, including drystone walls, and is a haven for nature lovers.

Are there any places to stop for refreshments or facilities along the route?

The route passes through rural areas, but Trefor itself offers some basic amenities. For more options, you might consider nearby villages or towns on the Llŷn Peninsula. It's always advisable to carry sufficient water and snacks, as refreshment stops may be infrequent, especially outside of peak season.

How long does it typically take to complete the Bwlch Mawr loop?

The Bwlch Mawr loop is estimated to take approximately 2 hours and 20 minutes to complete for an average touring cyclist. This duration can vary based on your fitness level, the number of stops you make to enjoy the views, and weather conditions.

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