4.4
(460)
2,011
riders
155
rides
Mountain bike trails around Groslay are primarily found within the expansive Montmorency Forest, which borders the town. This hilly forest features a varied terrain with significant elevation changes, characterized by a mix of oak, beech, birch, and Scots pine trees. The landscape includes undulating paths, streams, and small lakes, providing a diverse environment for mountain biking. The region offers a network of trails suitable for various skill levels.
Last updated: October 30, 2026
4.6
(10)
25
riders
31.7km
02:39
420m
420m
Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary.
5
riders
15.0km
01:07
210m
210m
Easy mountain bike ride.

4.4
(5)
39
riders
32.3km
02:45
430m
430m
Moderate mountain bike ride. Good fitness required.
5.0
(5)
4
riders
16.6km
01:19
200m
200m
Easy mountain bike ride.
5.0
(1)
2
riders
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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A hassle for me. The impression that it's more for cyclo-cross
0
0
The singletrack is in good condition, first time I'm riding it. Nothing to report, it's easily rideable.
0
0
Nice playground, climbs, descents but also flat and each circuit changes depending on the dry or muddy!!!
0
0
Very small but very cute castle in the middle of the forest
0
0
It's a shame that the forestry machines don't restore the site to its original state.
0
0
The mountain bike trails around Groslay are primarily located within the Montmorency Forest, offering a varied and hilly terrain. You'll encounter undulating paths, significant elevation changes, and a mix of oak, beech, birch, and Scots pine trees, providing picturesque and shaded routes. The forest also features streams and small lakes, adding to the natural beauty.
There are over 140 mountain bike trails available around Groslay, catering to a wide range of skill levels. This includes 51 easy routes, 86 moderate routes, and 9 more challenging options, ensuring there's something for every rider.
Yes, the Montmorency Forest offers several family-friendly mountain bike trails, particularly among the 51 easy routes available. These trails often feature less challenging terrain and shorter distances, perfect for a leisurely ride with the family. An example of an easy route is Towpath Epinay – Étang de Pêche loop from La Barre - Ormesson, which is 20.1 km long.
While exploring the trails, you can encounter several interesting landmarks. The historic Pond and Château de la Chasse is a medieval building nestled within the forest. You might also discover traces of ancient remains like the Devil's Bridge and the 19th-century Plumet Tower. The forest itself is a natural attraction, with diverse wildlife and scenic views.
The mountain bike trails around Groslay are highly rated by the komoot community, with an average score of 4.4 stars from over 300 reviews. Riders often praise the varied terrain, the beautiful forest scenery, and the network of trails that offer options for different ability levels. Over 1600 mountain bikers have used komoot to explore this area.
Yes, many trails in the Montmorency Forest are accessible from towns like Ecouen Ezanville and Deuil-la-Barre, which are typically served by public transport. This allows you to start your ride without needing a car. Always check local public transport schedules for the most up-to-date information.
Yes, many of the mountain bike routes around Groslay are designed as loops, offering circular experiences. For example, the View of Paris – Pond and Château de la Chasse loop from Deuil - Montmagny is a popular moderate 29.2 km circular path that offers scenic views and passes by the Château de la Chasse.
The Montmorency Forest offers enjoyable mountain biking conditions throughout much of the year. Spring and autumn provide pleasant temperatures and beautiful foliage. Summer is also great, with the forest providing ample shade. While winter riding is possible, be mindful of potential muddy or icy conditions on trails, especially after rain or snow.
Generally, dogs are welcome in the Montmorency Forest, but it's important to keep them on a leash, especially given the presence of diverse wildlife such as deer, wild boar, foxes, and badgers. Always ensure your dog is under control and respect local regulations regarding pets in natural areas.
Access points to the Montmorency Forest, particularly near towns like Groslay, Ecouen Ezanville, and Deuil-la-Barre, typically have designated parking areas. These spots provide convenient starting points for your mountain biking adventures into the forest. Look for signs indicating forest access or parking for visitors.
While the majority of trails are easy to moderate, there are 9 difficult routes for experienced mountain bikers seeking a challenge. These routes feature more technical sections and significant elevation changes within the hilly Montmorency Forest terrain. One example of a moderate trail with varied terrain is Batterie de Blémur – Single uphill loop from La Barre - Ormesson.
Yes, some trails offer excellent viewpoints. For instance, the View of Paris – Pond and Château de la Chasse loop from La Barre - Ormesson is a moderate 28.1 km route that provides scenic views, including glimpses towards Paris, as you navigate through the forest.


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