4.5
(151)
688
riders
82
rides
Mountain biking around Le Tertre-Saint-Denis offers routes through a rural commune situated on the Mantois plateau. The landscape is characterized by its undulating topography, with elevations ranging from 123 to 168 meters above sea level. This green setting in the Yvelines department provides natural inclines and descents suitable for off-road cycling. The area's unpaved roads and paths cater to cross-country or gravel riding.
Last updated: July 5, 2026
18
riders
41.5km
03:21
400m
400m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
5.0
(2)
9
riders
31.0km
02:32
290m
290m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.

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4.3
(3)
6
riders
25.1km
02:01
230m
230m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
9
riders
Moderate mountain bike ride. Good fitness required. Advanced riding skills necessary.
4.0
(1)
6
riders
26.3km
02:05
270m
270m
Moderate mountain bike ride. Good fitness required. Suitable for all skill levels.
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picturesque village with many interesting stories told on a tourist sign
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A pleasant surprise, this passage on this old stone bridge
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Below, sporty mountain bike descent and arrival at a small river with a Roman stone bridge to cross
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The regional forest of Rosny is the green lung of the north-west of Île-de-France, with 1,751 hectares of wooded areas classified as a Natura 2000 site. It is located on a plateau which offers beautiful viewpoints when the landscape emerges.
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Very nice passage, you can even stop there to fill the cans thanks to a drinking fountain just below!
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One of the most beautiful Ile de France villages with its many vestiges.
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Five points to see in this village: the church and its fortifications, the Porte de Bretagne, the wash house, the pink house - which turns out to be a restaurant called 'the green mare', the graves of the six Australian aviators with the messages engraved with their loved ones.
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There are over 80 mountain bike routes available around Le Tertre-Saint-Denis. These trails offer a variety of experiences across the region's undulating landscape.
The majority of mountain bike trails in Le Tertre-Saint-Denis are classified as moderate, with 58 routes falling into this category. There are also 21 easy trails and 1 difficult trail, offering options for various skill levels, though the area primarily caters to cross-country or gravel riding rather than highly technical descents.
You can expect a rural and green setting with an undulating topography. The trails traverse the Mantois plateau, featuring natural inclines and descents. The routes primarily consist of unpaved roads and paths, suitable for cross-country or gravel riding.
Yes, many of the routes around Le Tertre-Saint-Denis are designed as loops. For example, you can try the Pont de l'Arche – Porte de Bretagne loop from Le Tertre-Saint-Denis, which is a moderate 31.2 km ride.
The area is highly rated by the komoot community, with an average score of 4.5 stars from over 150 reviews. Mountain bikers often praise the preserved rural setting, the varied terrain, and the peaceful atmosphere for off-road cycling.
While Le Tertre-Saint-Denis itself is focused on its rural character, the wider region offers some points of interest. You might consider visiting the Donjon and Fortified Site of Montchauvet or the impressive Collegiate Church of Notre-Dame de Mantes-la-Jolie, which are within a reasonable distance from some of the trails.
Given the prevalence of moderate and easy trails, many routes around Le Tertre-Saint-Denis can be suitable for families, especially those comfortable with cross-country or gravel riding. The undulating terrain provides some challenge without being overly technical. Always check the specific route details for elevation and distance to ensure it matches your family's ability.
While specific regulations can vary, generally, dogs are permitted on public paths and trails in rural areas like Le Tertre-Saint-Denis, often on a leash. It's always best to check local signage or specific trail rules before heading out with your canine companion.
As a rural commune, parking is generally available in or near the villages that serve as starting points for many routes. For example, routes often start from places like Boissy-Mauvoisin or Fontenay-Mauvoisin, where you can typically find local parking options.
The spring and autumn months generally offer the most pleasant conditions for mountain biking in Le Tertre-Saint-Denis, with milder temperatures and beautiful scenery. Summer can also be enjoyable, though it's advisable to ride earlier in the morning or later in the afternoon to avoid the midday heat. Winter riding is possible, but trails may be muddy or slippery depending on recent rainfall.
Yes, for those looking for a longer ride, the Chemin Rural d'Arnouville – Binanville Castle loop from Fontenay-Mauvoisin covers 44.5 km with significant elevation gain, offering a more extensive challenge for experienced riders.
Le Tertre-Saint-Denis is a small rural commune, so amenities like cafes and dedicated accommodation are limited directly within the village. However, nearby larger towns in the Yvelines department will offer a wider selection of services, including cafes, restaurants, and lodging options, often just a short drive from the trailheads.


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