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France
Ile-de-France
Mantes-La-Jolie

Saint-Illiers-Le-Bois

The best walks and hikes around Saint-Illiers-Le-Bois

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.

Best hiking trails around Saint-Illiers-Le-Bois

  • The most popular hiking route is Rosny Forest – Calcareous grasslands loop from Boissy-Mauvoisin, an 8.5 miles (13.7 km) trail that takes about 3 hours 42 minutes to complete, traversing both forest and open terrain.
  • Another top…

Last updated: July 5, 2026

5.0

(3)

21

hikers

#1.

Rosny Forest – Calcareous grasslands loop from Boissy-Mauvoisin

13.7km

03:43

190m

190m

Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

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Moderate

Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.

Easy
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Hard hike. Very good fitness required. Easily-accessible paths. Suitable for all skill levels.

Hard

Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.

Easy

Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

Moderate
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Popular around Saint-Illiers-Le-Bois

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Tips from the Community

Nicolas Vergnaud
August 12, 2023, Forêt de Rosny

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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Frequently Asked Questions

How many hiking trails are available around Saint-Illiers-Le-Bois?

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.

Are there easy hiking trails suitable for beginners in Saint-Illiers-Le-Bois?

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.

What kind of terrain can I expect on hikes in Saint-Illiers-Le-Bois?

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.

Are there any circular walks in the Saint-Illiers-Le-Bois area?

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.

What are some family-friendly hiking options in Saint-Illiers-Le-Bois?

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.

Are dogs allowed on the hiking trails in Saint-Illiers-Le-Bois?

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.

What can I see along the hiking trails in Saint-Illiers-Le-Bois?

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.

Are there any viewpoints along the hiking routes?

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.

What do other hikers enjoy most about hiking in Saint-Illiers-Le-Bois?

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.

Is there parking available at the trailheads?

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.

What is the best time of year to hike in Saint-Illiers-Le-Bois?

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.

Are there any longer, more challenging hikes in the area?

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.

Most popular routes around Saint-Illiers-Le-Bois

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