4.3
(278)
1,421
riders
168
rides
Mountain biking in Forêt De Rosny offers a diverse landscape characterized by dense woodlands, river valleys, and elevated viewpoints. The region, situated near Mantes-La-Jolie, features a network of trails that traverse varied terrain, including historical sites and scenic ridges. Riders can expect a mix of forest paths and open sections, with some routes providing significant elevation changes. The area's geology contributes to a varied riding experience, from rolling forest trails to more challenging climbs.
Last updated: May 8, 2026
3.5
(2)
24
riders
53.0km
04:32
810m
810m
Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary.
5.0
(15)
38
riders
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

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4.5
(2)
17
riders
43.8km
03:18
420m
420m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
10
riders
79.1km
06:53
1,230m
1,230m
Hard mountain bike ride. Very good fitness required. Advanced riding skills necessary.
5.0
(3)
12
riders
21.1km
01:40
80m
80m
Easy mountain bike ride. Great for any fitness level. Suitable for all skill levels.
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We can only recommend this
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Maybe the oldest medieval small castle still in an almost original state
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Superb and very confortable to get to, free parking close by.
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Beautiful castle on the banks of the Seine
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Plan to have good brakes for the descent!
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Forêt De Rosny offers a wide selection of mountain bike trails, with over 150 routes available. These range from easy forest paths to more challenging routes with significant climbs.
Yes, Forêt De Rosny has approximately 50 easy mountain bike trails, perfect for beginners or those looking for a more relaxed ride. These routes typically feature less elevation gain and smoother terrain.
The terrain in Forêt De Rosny is diverse, characterized by dense woodlands, river valleys, and elevated viewpoints. You'll encounter a mix of forest paths, open sections, and some routes with notable elevation changes, offering a varied riding experience.
For advanced riders seeking a challenge, Forêt De Rosny offers 6 difficult mountain bike trails. These routes typically feature more significant elevation changes and technical sections, providing a demanding ride.
Many of the mountain bike routes in Forêt De Rosny are circular, allowing you to start and finish at the same point. An example is the Wash-house and manor house – Belvédère de Rolleboise loop from Rosny-sur-Seine, a moderate 46 km route.
Forêt De Rosny features several elevated viewpoints offering panoramic vistas. The Cliffs of La Roche-Guyon – View of the route des crêtes loop from Bonnières is a great option, leading through forests and along ridges with expansive views.
The komoot community highly rates mountain biking in Forêt De Rosny, with an average score of 4.4 stars from over 200 reviews. Riders often praise the diverse landscape, the mix of forest and open sections, and the historical landmarks found along the trails.
Yes, the region is rich in historical sites. Routes like the Belvédère de Rolleboise – Wash-house and manor house loop from Boissy-Mauvoisin lead through varied forest terrain with historical landmarks and elevated views, including wash-houses and manor houses.
Moderate mountain bike rides in Forêt De Rosny can vary in duration depending on the route length and your pace. For example, the Belvédère de Rolleboise – Wash-house and manor house loop from Boissy-Mauvoisin, which is 29.7 km, typically takes around 2 hours 49 minutes to complete.
Yes, Forêt De Rosny offers longer routes for those seeking extended rides. The Beautiful path – Old Mill of Vernon loop from Bonnières is a moderate 52.6 km path that offers a mix of riverside and forest trails, suitable for longer excursions.
While mountain biking is enjoyable year-round, spring and autumn generally offer the most pleasant conditions in Forêt De Rosny. The weather is milder, and the forest scenery is particularly beautiful with changing foliage or blooming flora. Summer can be warm, and winter may bring muddy or icy conditions.
Parking is generally available near the trailheads and villages surrounding Forêt De Rosny, such as Boissy-Mauvoisin or Bonnières-sur-Seine. It's advisable to check specific route starting points on komoot for detailed parking information.


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