4.4
(241)
1,271
riders
153
rides
Mountain biking around Le Tréhou offers access to the varied terrain of the Monts d'Arrée, characterized by wild moors, dense forests, and rocky ridges. This region in Finistère, Brittany, features significant elevation changes, providing both challenging climbs and exciting descents. The landscape includes extensive heathland and diverse natural spaces, making it suitable for a range of outdoor activities.
Last updated: May 14, 2026
4.5
(8)
51
riders
44.1km
03:50
690m
690m
Hard mountain bike ride. Good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.
4.3
(3)
26
riders
44.9km
04:05
830m
830m
Hard mountain bike ride. Good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.

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5.0
(1)
23
riders
69.2km
05:55
990m
990m
Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary. Some portions of the route may require you to push your bike.
5
riders
42.2km
03:14
480m
480m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
10
riders
24.9km
02:04
390m
390m
Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary.
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The chapel originally dates back to the 17th century. A visit is definitely worth it – the view is simply fantastic!
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Great preparation course at the end of the day
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Very beautiful lake with a beautiful beach and nautical base.
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Incredible view from the second highest point of the Breton part of the Armorican Massif in the Monts d'Arrée.
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Very beautiful chapel, recently restored after a fire in 2022. The panorama over the entire Monts d'Arrée, the sea and the crests of the Montagnes Noires is magnificent.
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Church of SANT-SERVAIS Impressive ensemble consisting of church, ossuary (now museum) and adjoining triumphal arch. The church also reveals numerous original carpentry works with decorations, such as the theatricality of the interior or the literally fantastic stonework that adorns the façade.
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Exceptional views from the summit. You can reach the summit by racing bike, although the last part is a bit gravelly.
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Plage de Sizum - here is the best beach on the lake.
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Le Tréhou offers a comprehensive network of over 140 mountain bike trails. These routes cater to various skill levels, with 18 easy, 92 moderate, and 30 difficult options, primarily exploring the diverse terrain of the Monts d'Arrée.
The mountain bike trails around Le Tréhou primarily traverse the Monts d'Arrée, featuring a captivating mix of wild moors, dense forests, and rocky ridges. You'll encounter significant elevation changes, providing both challenging climbs and exciting descents across varied landscapes, including extensive heathland.
Yes, Le Tréhou has 18 easy mountain bike trails. These routes are generally less demanding, often following forest paths or less technical terrain, making them suitable for beginners or those looking for a more relaxed ride through the natural landscapes of the Monts d'Arrée.
Experienced riders will find 30 difficult mountain bike trails around Le Tréhou. Notable challenging routes include the Drennec Dam – Menez Kador loop from Sizun, which covers 36.8 km with over 600 meters of elevation gain, and the Saint-Michel Chapel – Montagne Saint-Michel loop from Sizun, a 44.8 km route with over 800 meters of climbing.
Many of the mountain bike trails around Le Tréhou are designed as circular routes, allowing you to start and finish at the same point. For example, the Bois de l’Ermitage – Bois du Gars loop from Irvillac is a moderate 27.2 km circular trail, and the Just an old church – Mountain Bike Trail loop from Saint-Urbain offers a moderate 37.1 km loop.
The mountain bike trails around Le Tréhou are highly rated by the komoot community, with an average score of 4.4 stars from over 250 reviews. Riders often praise the varied terrain, the significant elevation changes that offer exciting descents, and the wild, natural beauty of the Monts d'Arrée.
Yes, the Monts d'Arrée, with peaks up to 385 meters, offer numerous viewpoints. From higher elevations, you can enjoy breathtaking panoramic views of the Armorique Regional Natural Park, extending towards the ocean. Mont Saint-Michel de Brasparts, for instance, provides a 360° panorama over the legendary Yeun Elez peat bogs.
While mountain biking, you can explore several historical and natural attractions. Nearby highlights include the historic Château de La Roche-Maurice, the Saint-Sauveur Church of Le Faou, and the ancient Daoulas Abbey. The region also features wild moors and the mysterious Huelgoat forest with its rocky chaos.
Le Tréhou and the Monts d'Arrée offer mountain biking opportunities throughout the year. However, the best times are typically spring and autumn when the weather is milder and the landscapes are particularly vibrant. During winter, some trails might be muddy or wet, while summer can be pleasant but may require earlier starts to avoid the midday heat.
The Monts d'Arrée region is well-known for hosting the famous 'Roc'h des Monts d'Arrée' mountain bike event every September. This event attracts thousands of participants to its marked trails, solidifying the area's reputation as a mountain biking hotspot.
The longest mountain bike trail listed is the Montagne Saint-Michel – Saint-Michel Chapel loop from Irvillac. This difficult route spans 94.8 km and features a significant elevation gain of almost 1,300 meters, offering a substantial challenge for endurance riders.
Yes, for broader information on mountain biking across Brittany, you can consult resources like Brittany Tourism's guide to mountain biking in the region. This can help you discover other areas and trails suitable for mountain biking in the wider Finistère department.


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