4.6
(435)
2,244
hikers
253
hikes
Hiking around Jagny-Sous-Bois offers diverse terrain within the Val-d'Oise department. The area is characterized by its elevated position on the northern flank of the Mareil-en-France hill, providing views over the Ysieux valley. Nearby, the Forêt Domaniale de Carnelle presents extensive woodlands and varied landscapes, contributing to the region's hiking appeal. The Plateau de Thimecourt also features prominently in local routes, offering additional exploration opportunities.
Last updated: July 1, 2026
4.0
(1)
15
hikers
7.44km
02:00
90m
90m
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.
5.0
(1)
3
hikers
7.44km
02:01
100m
100m
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.

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4.5
(2)
4
hikers
7.07km
01:56
110m
110m
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.
7
hikers
Hard hike. Very good fitness required. Easily-accessible paths. Suitable for all skill levels.
5
hikers
7.04km
01:51
50m
50m
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.
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very good course for trail training
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Thimecourt Plain in Fosses
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Hérivaux Abbey is a former Augustinian abbey founded in the 12th century. The abbey was once a thriving religious center, but it was partially destroyed during the French Revolution by Benjamin Constant, who purchased it as a national asset.
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Take a look at the Abbey of Hérivaux.
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A 3-meter-high isolated menhir, made of sandstone, with a typical shark's fin shape, suggesting that a part has been broken. Accessible by walking along the wood in the field, it is visible from the field or the woods.
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Nice descent to be careful! Lots of stones and pebbles. Technical
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There are over 200 hiking routes in and around Jagny-sous-Bois. These trails cater to various fitness levels, from easy walks to more challenging excursions.
Hikes around Jagny-sous-Bois offer diverse terrain. You'll find elevated positions with panoramic views over the Ysieux valley, varied landscapes on the Butte de Mareil-en-France, and extensive woodlands within the nearby Forêt Domaniale de Carnelle and Forêt de Coye. The Plateau de Thimecourt also features prominently, providing varied paths for exploration.
Yes, Jagny-sous-Bois offers many easy hiking options. Over 100 routes are classified as easy, perfect for beginners or families. An example is the Hérivaux Abbey – Plateau de Thimecourt Fosses loop from Lassy, which is 4.3 miles (6.9 km) and combines natural exploration with a visit to a historic site.
Many of the trails around Jagny-sous-Bois are circular, allowing you to start and end at the same point. For instance, the popular Plateau de Thimecourt Fosses loop from Le Plessis-Luzarches is a 4.6-mile (7.4 km) circular route exploring the varied terrain of the Plateau de Thimecourt.
Several hiking routes incorporate historical and natural attractions. You can visit the historic Abbey of Hérivaux, which is part of routes like the Hérivaux Abbey – Plateau de Thimecourt Fosses loop from Lassy. Other notable nearby attractions include the Royaumont Abbey, various castles such as Pontarmé Castle, and natural features like the Blue Lake of Carnelle.
Generally, the natural areas and forest trails around Jagny-sous-Bois are dog-friendly, making it a great place to hike with your canine companion. However, it's always advisable to keep dogs on a leash, especially in protected areas or near wildlife, and to respect local signage.
The area is highly rated by the komoot community, with an average score of 4.6 stars from over 400 reviews. Hikers often praise the varied terrain, the scenic views over the Ysieux valley, and the peaceful atmosphere of the extensive woodlands in the Forêt Domaniale de Carnelle.
Yes, for experienced hikers seeking a challenge, there are routes classified as difficult. For example, the Plateau de Thimecourt Fosses loop from Jagny-sous-Bois is a 12.5-mile (20.2 km) route with significant elevation gain, requiring very good physical condition.
Jagny-sous-Bois offers pleasant hiking opportunities throughout much of the year. Spring and autumn provide comfortable temperatures and beautiful scenery with blooming flowers or vibrant fall foliage. Summer is also suitable, especially for shaded forest trails. Winter hiking is possible, but trails may be muddy or slippery, so appropriate gear is recommended.
Yes, many trailheads in and around Jagny-sous-Bois, particularly those starting from villages like Le Plessis-Luzarches, Lassy, or Bellefontaine, offer designated parking areas. It's always a good idea to check the specific route details on komoot for parking information related to your chosen trail.
While Jagny-sous-Bois itself is a smaller commune, public transport options may be available to nearby towns that serve as starting points for hikes. For detailed information on local bus services or train connections to the broader Val-d'Oise region, it's best to consult local transport authorities or the official website of the commune, such as carnelle-pays-de-france.fr.


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