4.4
(59)
344
hikers
48
hikes
Hiking around Saint-Illiers-Le-Bois offers a network of trails through varied landscapes. The region features areas of dense woodland, such as Rosny Forest, alongside open calcareous grasslands. Gentle elevation changes characterize many routes, providing accessible options for exploration.
Last updated: July 5, 2026
5.0
(3)
21
hikers
13.7km
03:43
190m
190m
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.
4.5
(2)
19
hikers
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.

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5.0
(2)
8
hikers
19.3km
05:16
300m
300m
Hard hike. Very good fitness required. Easily-accessible paths. Suitable for all skill levels.
5
hikers
6.73km
01:46
50m
50m
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.
5
hikers
9.37km
02:30
110m
110m
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.
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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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Magnificent washhouse in a superb location.
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A beautiful wash house in front of a very beautiful house.
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There are over 45 hiking routes available around Saint-Illiers-Le-Bois, catering to various skill levels from easy strolls to more challenging treks. The region offers a diverse network of trails through woodlands and open calcareous grasslands.
Yes, Saint-Illiers-Le-Bois offers several easy trails perfect for beginners. For example, the Walk Near the Gas Wells – Ferme des Huit Routes loop from Boissy-Mauvoisin is an easy 4.1-mile (6.7 km) path with gentle elevation changes, ideal for a relaxed walk.
The hiking trails in Saint-Illiers-Le-Bois feature a mix of dense woodlands, such as Rosny Forest, and open calcareous grasslands. You can expect gentle elevation changes on many routes, making them accessible for various fitness levels.
Many routes in the region are designed as circular walks, allowing you to start and end at the same point. An example is the Rosny Forest – Calcareous grasslands loop from Boissy-Mauvoisin, which is an 8.5-mile (13.7 km) trail.
For families, routes with shorter distances and minimal elevation are ideal. The Ferme des Huit Routes loop from Boissy-Mauvoisin is an easy 4.2-mile (6.7 km) trail that provides a pleasant outing for all ages.
Generally, dogs are welcome on trails in the Saint-Illiers-Le-Bois region. It's always recommended to keep them on a leash, especially in areas with wildlife or near agricultural land, and to respect local regulations.
Beyond the natural beauty of forests and grasslands, you can discover historical and scenic points of interest. Notable attractions include the Neauphlette Church, Saint-Aubin Church, Pacy-sur-Eure, and the impressive Château de Tilly.
Yes, the region offers scenic spots. For panoramic views, consider visiting the Belvédère de Rolleboise, which can be incorporated into longer hikes or visited separately.
The komoot community highly rates the trails in Saint-Illiers-Le-Bois, with an average score of 4.4 stars from over 60 reviews. Hikers often praise the peaceful blend of dense forests and open fields, as well as the well-maintained paths suitable for various abilities.
Many popular trailheads and starting points in and around Saint-Illiers-Le-Bois, particularly those near villages like Boissy-Mauvoisin or Saint-Illiers-la-Ville, offer designated parking areas for hikers. It's advisable to check specific route details for parking information.
The region is enjoyable for hiking throughout much of the year. Spring and autumn offer pleasant temperatures and beautiful scenery with blooming wildflowers or vibrant fall foliage. Summer is also popular, especially for shaded forest trails, while winter can provide a unique, tranquil experience on clear days.
For those seeking a greater challenge, there are more difficult routes available. The Calcareous grasslands – Rosny Forest loop from Lommoye is a demanding 12-mile (19.3 km) trail with significant elevation changes, offering a rewarding experience for experienced hikers.


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