4.1
(61)
280
riders
36
rides
Gravel biking around Vallée du Costour, located near Brest, features diverse landscapes suitable for varied riding experiences. The region is characterized by lush forests, serene water bodies including a large lake and numerous streams, and varied terrain. Historical remnants of a former gunpowder factory are also present along many routes, adding a unique dimension to the natural environment. The valley's geological composition includes decomposed rock and gneiss, offering varied surfaces for gravel biking.
Last updated: May 21, 2026
4.3
(7)
58
riders
53.6km
03:56
760m
760m
Hard gravel ride. Very good fitness required. You may need to push your bike for some segments of this route.
4.5
(19)
42
riders
48.3km
02:53
330m
330m
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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4.0
(2)
35
riders
60.7km
03:31
330m
330m
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
4.4
(14)
35
riders
54km
03:09
300m
300m
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
5.0
(2)
17
riders
44.0km
02:50
390m
390m
Moderate gravel ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
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A beautiful walk with a magnificent view.
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A magnificent landscape on both sides!!!
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There is no road on this viaduct, just a railway! Komoot won't suggest it to you anyway. The road passing at the foot is a fairly large country road but pleasant. When it is not cluttered with brambles, it is possible to take a pedestrian and cycle path bordering the road on the pond side when leaving Le Relecq Kerhuon, up to the first crossroads (direction Le Douvez, Landerneau).
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In front of the church on the left there is a wonderful boulangerie / patisserie called "Le Pêche Mignon"
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Probably the most beautiful roads you can ride in this area. 100% worth visiting! Roads can get a little tight around some blind corners so be careful
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A beautiful bike path – and here a wonderful rest area by a stream. Across the street is a park – huge. You can dip your feet in the stream to cool off.
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Very beautiful little chapel, worth the detour
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There are over 75 gravel bike trails around Vallée du Costour, offering a wide range of options for different skill levels and preferences. The komoot community has explored these routes extensively, with over 500 gravel bikers using the platform to discover the area's diverse terrain.
You can expect a varied landscape, from lush deciduous forests with chestnut, oak, beech, and maple trees to dry wooded heathland. The trails often follow serene water bodies, including a large lake and numerous streams. While generally passable in dry weather, some sections can be steep and muddy, especially in winter, adding to the challenge and adventure.
Yes, Vallée du Costour offers several routes suitable for families. There are 4 easy-rated tours that provide a gentler experience, allowing families to enjoy the natural beauty without overly strenuous climbs. These routes typically feature well-maintained paths through forests and along water features.
The trails in Vallée du Costour cater to various skill levels. You'll find 4 easy routes, 53 moderate routes, and 20 difficult routes. This variety ensures that both beginners looking for a relaxed ride and experienced gravel bikers seeking a significant challenge can find suitable options.
Many of the gravel bike routes in Vallée du Costour are designed as loops, allowing you to start and finish at the same point. For example, the popular Anse du Moulin Blanc – Anse du Moulin Blanc loop from École nationale supérieure de techniques avancées is a moderate 19.7-mile (31.7 km) trail that offers varied terrain within the valley.
Vallée du Costour is rich in history. You can explore the remnants of the 'Poudrerie du Moulin Blanc,' a former gunpowder factory established in 1876, including old buildings and two washhouses. These historical vestiges add a unique dimension to your ride through the valley.
Yes, several routes offer magnificent panoramic views. Mid-way through some trails, you can enjoy stunning vistas of the Brest harbor, the railway line, and the Anse du Moulin Blanc. These viewpoints provide excellent opportunities for a break and to appreciate the region's beauty.
The best time for gravel biking is generally during dry weather. While the trails are beautiful year-round, some can become steep and muddy in winter. Spring and autumn offer pleasant temperatures and vibrant scenery, while summer provides longer daylight hours. Always check local weather conditions before heading out.
Vallée du Costour is situated between the communes of Guipavas and Le Relecq-Kerhuon, near Brest. Public transport options in the Brest Métropole area, such as buses, can provide access to the vicinity of the valley. It's advisable to check the local transport network (e.g., Bibus) for routes and schedules that accommodate bicycles.
Given its popularity for outdoor activities, there are typically designated parking areas near the main access points of Vallée du Costour, particularly around the communes of Guipavas and Le Relecq-Kerhuon. Look for parking facilities close to trailheads or popular starting points for easy access to the routes.
The gravel biking routes in Vallée du Costour are highly rated by the komoot community, with an average score of 4.4 stars from over 90 reviews. Riders often praise the diverse landscapes, the mix of natural beauty and historical elements, and the variety of routes suitable for different fitness levels.
Absolutely. For experienced riders seeking a significant challenge, the View of Vougot Beach (Grève du Vougot) – Saint Jaoua Chapel loop from Kerhuon is a difficult 73.5-mile (118.3 km) path. This extensive route provides not only a physical test but also offers expansive views and a comprehensive exploration of the region.


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