4.6
(158)
749
hikers
142
hikes
Hiking around Lagny-Le-Sec, located in the Oise department of France, features a gently undulating terrain with elevations ranging from 94 to 116 meters and an average altitude of 105 meters. The region is characterized by extensive forests, including Ermenonville Forest and Montlognon woods, providing a green environment for exploration. It is situated within the Oise-Pays de France Regional Natural Park, which preserves its natural features like Les Bruyères de Frais-Vent, known for its large sandstone blocks. The Launette and Ru…
Last updated: June 25, 2026
5.0
(7)
24
hikers
23.3km
06:07
180m
180m
Hard hike. Very good fitness required. Mostly accessible paths. Sure-footedness required.
3.8
(4)
15
hikers
Moderate hike. Good fitness required. Mostly accessible paths. Sure-footedness required.

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5.0
(1)
2
hikers
24.8km
06:31
200m
210m
Hard hike. Very good fitness required. Easily-accessible paths. Suitable for all skill levels.
4.7
(6)
37
hikers
6.87km
01:50
70m
70m
Easy hike. Great for any fitness level. Easily-accessible paths. Suitable for all skill levels.
4.5
(8)
25
hikers
10.3km
02:45
110m
110m
Moderate hike. Good fitness required. Easily-accessible paths. Suitable for all skill levels.
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Spanning over 3,300 hectares, the Ermenonville forest, along with those of Halatte and Chantilly, forms the vast Trois Forêts massif. Once owned by the monks of Chaalis and other nearby abbeys, it is now renowned for its moors, Scots pines, and sandy soil, home to rare wildlife such as the European nightjar and the praying mantis.
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Pine trees, sand, ferns galore. In short, you're transported elsewhere and breathe in the air of the Landes...
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Beautiful washhouse in a beautiful location. Located between Jean Jacques Rousseau Park and Ermenonville Castle.
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This castle is a very pretty place full of charm which according to Wikipedia dates from the 18th century and whose origins date back to the year 987!!!!!
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Nice, yes, calm and peaceful... 4 km in line with the runway of CDG airport, the noise of planes taking off every 2 minutes at an altitude of a few hundred meters is infernal, even during breaks. How the locals manage 24/7 is beyond me...
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Perfect setting in Jean Jacques Rosseau Park to rest your feet while enjoying a picnic
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There are over 130 hiking routes around Lagny-Le-Sec, offering a wide variety of options for different skill levels and preferences. You'll find trails ranging from easy strolls to more challenging long-distance hikes.
The terrain around Lagny-Le-Sec is primarily characterized by extensive forests, such as the Ermenonville Forest, and gentle rolling landscapes within the Oise-Pays de France regional natural park. Hikers can expect paths through woodlands, past historic sites, and with modest elevation changes.
Yes, Lagny-Le-Sec offers a good selection of easy hikes. With 48 routes classified as easy, there are plenty of options for beginners or those looking for a relaxed walk. These trails typically have minimal elevation gain and are shorter in distance.
Many of the trails around Lagny-Le-Sec are suitable for families, especially those that are shorter and have less elevation. Look for routes that traverse the gentle forest paths, which are often well-maintained and provide a pleasant experience for all ages.
Yes, the region features numerous circular walks. For example, the Forest and castle of Ermenonville — loop is a moderate 7.7-mile (12.4 km) path that allows you to start and end at the same point, exploring woodlands and historical views.
The hiking trails often lead past significant historical sites. You can explore places like Chaalis Abbey and various castles, including Château d'Ermenonville and Château de Mortefontaine. These offer a rich cultural experience alongside your outdoor adventure.
The area is highly rated by the komoot community, with an average score of 4.6 stars from over 130 reviews. Reviewers often praise the extensive and peaceful forest environments, the well-maintained paths, and the opportunity to combine nature with historical exploration.
Yes, for those seeking a longer challenge, there are several difficult routes. The Loop near Meaux is a 15.4-mile (24.8 km) trail that takes about 6 hours 31 minutes to complete, offering varied countryside. Another option is the Chaalis Abbey and Ermenonville Forest Loop, a 14.5-mile (23.3 km) route.
The region is beautiful year-round, but spring and autumn are particularly pleasant for hiking. In spring, the forests burst with new growth, and in autumn, the foliage offers stunning colors. Summer can be warm, making early morning or late afternoon hikes ideal, while winter offers crisp, quiet walks through the woodlands.
Generally, dogs are welcome on many of the hiking trails in the Oise-Pays de France regional natural park, especially on forest paths. However, it's always advisable to keep them on a leash, particularly in areas with wildlife or near historical sites, and to check specific regulations for any protected areas.
Parking is typically available at the start points of many popular trails, especially near villages or major attractions like Chaalis Abbey and Ermenonville Castle. It's recommended to check the specific route details on komoot for designated parking areas or nearby public parking options.
For spring hiking, layers are key. The weather can be changeable, so wear breathable base layers, a fleece or mid-layer for warmth, and a waterproof and windproof outer shell. Comfortable hiking boots are essential, as paths can be damp. Don't forget a hat and sunglasses for sunny spells.


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