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France
Ile-de-France
Palaiseau

Boullay-Les-Troux

The best walks and hikes around Boullay-Les-Troux

4.5

(2279)

13,131

hikers

641

hikes

Hiking around Boullay-Les-Troux provides access to the varied landscapes of the Haute Vallée de Chevreuse Regional Natural Park. This area is characterized by extensive forest massifs, river valleys, and agricultural plateaus. The terrain includes gentle gradients along river courses and more undulating paths through woodlands and open fields.

Best hiking trails around Boullay-Les-Troux

  • The most popular hiking route is Méridon Castle – Entrance to the Méridon Forest loop from Boullay-les-Troux, a 6.1 miles (9.8 km) trail that takes 2…

Last updated: May 8, 2026

4.7

(102)

297

hikers

#1.

Méridon Castle – Entrance to the Méridon Forest loop from Boullay-les-Troux

9.84km

02:36

90m

90m

Hard hike. Good fitness required. Sure-footedness, sturdy shoes and alpine experience required.

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Hard

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

Moderate
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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

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

Easy
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Tips from the Community

Neil Snape
July 12, 2025, Château de Breteuil

Beautiful chateau to visit or look at.

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Pretty castle well glimpsed at the heart of a beautiful gravel ride between Choisel and St Rémy

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The wash houses of Chevreuse are history reborn before our eyes. Here, along with the values, there were also tanneries.

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Saint-Rémy-lès-Chevreuse is the small town that you see displayed everywhere in Paris, because it is the RER B Terminus (South track). But it could have been otherwise! You can even walk along the old Limours (or Sceaux) track. For some obscure reason, the track stops there, but the old track continues!

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[In Advent] "we hear in the Gospel the beginning of the ministry of Saint JEAN BAPTIST. He appears in the desert and calls people to conversion so that they may prepare for the coming of the Lord. His call reminds us that Advent is not only a time of waiting, but also of interior preparation. "Prepare the way of the Lord, make straight his paths" (Luke 3:4). John's message challenges us to examine our lives. What "rough paths" and "crooked roads" are there in our hearts? Where have we perhaps distanced ourselves from God or lost sight of our fellow human beings? John invites us to remove these obstacles and reorient our lives. But his call has not only a personal dimension, but also a social one: the way of the Lord is a way of justice, peace and reconciliation. When we pave the way of the Lord, we bring light into the darkness of the world and hope into the hearts of people." (Text: Michael Inden, Diocesan President of the KAB in the Archdiocese of Cologne)

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While the Chevreuse Valley is well-known to all nature lovers in the Paris region, the town that gave it its name is less well-known. Its rich heritage is nevertheless worth a visit, particularly the Château de la Madeleine which overlooks the city.

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Beautiful view of the castle and its park. Several single tracks around the estate are perfect for exploring the surrounding woods.

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Saint-Rémy-lès-Chevreuse RER b station, beautiful starting point for long hikes in the Chevreuse valley

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Frequently Asked Questions

What kind of terrain can I expect on hikes around Boullay-Les-Troux?

The hiking trails around Boullay-Les-Troux offer a diverse landscape within the Haute Vallée de Chevreuse Regional Natural Park. You'll find extensive forest massifs, gentle gradients along river valleys like the Yvette, and undulating paths through agricultural plateaus. The area features a mix of woodlands, open fields, and charming hamlets.

How many hiking routes are available in the Boullay-Les-Troux area?

There are over 650 hiking routes documented around Boullay-Les-Troux on komoot. This includes a wide range of options, with approximately 290 easy routes, 280 moderate routes, and 70 more challenging trails, ensuring there's something for every skill level.

Are there any family-friendly hiking options near Boullay-Les-Troux?

Yes, the region offers many routes suitable for families. With nearly 300 easy routes available, you can find shorter, less strenuous walks through forests and fields. For example, the Breteuil Castle – Méridon Castle loop from Choisel is an easy 3.5-mile trail that takes you through historical estates and local countryside, perfect for a family outing.

What historical landmarks or attractions can I see while hiking?

The area is rich in historical sites. Many hiking routes incorporate châteaux and other points of interest. You can explore the grounds of La Madeleine Castle, Dampierre-en-Yvelines Castle, or Breteuil Castle. The charming town of Chevreuse, with its old millstone houses and washhouses along the Yvette, is also a highlight on some trails, such as the ⛲Lavoir de Chevreuse – Mélidala Symphonic Forest loop from Choisel.

What is the best time of year to go hiking in Boullay-Les-Troux?

Boullay-Les-Troux is beautiful throughout the year. Spring and summer offer lush green forests and fields dotted with poppies, while autumn transforms the landscape with vibrant orange hues. The region's extensive forest coverage also provides shaded paths, making it enjoyable even on warmer days. Winter hiking can be serene, though some paths might be muddy.

Are there any circular hiking routes available?

Yes, many of the trails around Boullay-Les-Troux are designed as circular loops, allowing you to start and end at the same point. An example is the Méridon Castle – Entrance to the Méridon Forest loop from Boullay-les-Troux, which is a popular 6.1-mile route exploring forest and castle grounds.

What do other hikers say about the trails in Boullay-Les-Troux?

The trails in Boullay-Les-Troux are highly regarded by the komoot community, holding an average rating of 4.5 stars from over 2,000 reviews. Hikers often praise the well-maintained paths, the tranquility of the forests, and the scenic beauty of the Yvette Valley and agricultural plateaus.

Can I access hiking trails using public transport?

The Haute Vallée de Chevreuse Regional Natural Park, which encompasses Boullay-Les-Troux, is generally accessible. While specific public transport links directly to every trailhead from Boullay-Les-Troux might vary, towns within the park like Saint-Rémy-lès-Chevreuse and Lozère are often served by public transport, providing starting points for many routes.

Are dogs allowed on the hiking trails?

Generally, dogs are welcome on most hiking trails in the Haute Vallée de Chevreuse Regional Natural Park, provided they are kept on a leash, especially in forested areas and near wildlife. It's always a good idea to check specific trail regulations or park signage for any restrictions before you go.

Are there any challenging hikes for experienced trekkers?

Yes, for those seeking a more strenuous experience, there are approximately 70 difficult routes in the area. The Méridon Castle – Entrance to the Méridon Forest loop from Boullay-les-Troux, for instance, is rated as difficult and offers a good workout while exploring varied terrain.

What natural features are prominent in the Boullay-Les-Troux hiking area?

The region is defined by its natural beauty, including the extensive forest massifs of the Haute Vallée de Chevreuse, the meandering Yvette River, and picturesque agricultural plateaus. You'll encounter diverse ecosystems, from dense woodlands to open fields, and enjoy scenic views across valleys and over historical estates.

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