4.8
(21)
445
riders
63
rides
Road cycling routes around Lagny-Le-Sec are situated in the Oise department, offering access to extensive natural landscapes. The region is characterized by undulating terrain and significant forests such as the Forêt d'Ermenonville and the Forêt de Chantilly, providing varied scenery for cyclists. These areas feature a mix of wooded paths and quiet roads, suitable for different road cycling experiences. The Oise department actively promotes cycling, with a network of routes that cater to various fitness levels.
Last updated: May 21, 2026
4.5
(6)
79
riders
Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride.
4.8
(4)
74
riders
Moderate road ride. Good fitness required. Some segments of this route may be unpaved and difficult to ride.

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5.0
(1)
36
riders
75.8km
03:19
440m
440m
Moderate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride.
5.0
(1)
22
riders
33.9km
01:30
170m
170m
Easy road ride. Great for any fitness level. Mostly well-paved surfaces and easy to ride.
12
riders
Moderate road ride. Good fitness required. Some segments of this route may be unpaved and difficult to ride.
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The Château de Thiers-sur-Thève, now in ruins, is a former 13th-century fortified castle listed as a Historic Monument in 1862. Built as a hunting lodge for the bishops of Beauvais, it is distinguished by its large state room pierced with large windows, a rare example of medieval residential architecture in the Île-de-France region. Partially dismantled in the 15th century, its circular towers, moats, and Gothic remains can still be admired.
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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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Perfect setting in Jean Jacques Rosseau Park to rest your feet while enjoying a picnic
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best view of the castle 🏰
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best spots to take a break and admire the castle
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There are over 65 road cycling routes around Lagny-Le-Sec listed on komoot, catering to various skill levels. You'll find a good mix of easy and moderate rides, with 18 easy routes and 47 moderate ones.
The region around Lagny-Le-Sec offers undulating terrain, providing engaging rides without being overly mountainous. You'll cycle through extensive woodlands, notably the Forêt d'Ermenonville and the Forêt de Chantilly, which offer picturesque, shaded routes. The Oise department also features quiet country roads and some dedicated cycling paths.
Yes, there are 18 easy road cycling routes around Lagny-Le-Sec. A good option for a more relaxed ride is the Mini bell tower – Othis Church loop from Le Plessis-Belleville, which is 21.0 miles (33.9 km) long and takes you through local villages and rural landscapes.
For longer and more challenging rides, consider routes like the 14th Century Church of Baron – Ermenonville Castle loop from Le Plessis-Belleville, which spans over 111 km with significant elevation gain. Many of the 47 moderate routes offer substantial distances and elevation changes for experienced cyclists.
Many routes pass by significant historical and natural attractions. You can visit the impressive Château d'Ermenonville, the serene Chaalis Abbey with its ruins and gardens, or the Château de Mortefontaine. The region's extensive forests, like the Forêt d'Ermenonville, are also natural highlights.
Yes, many of the road cycling routes around Lagny-Le-Sec are designed as loops, allowing you to start and finish at the same point. Examples include the Ermenonville Castle – Chantilly Castle loop from Le Plessis-Belleville and the Jean-Jacques Rousseau Park – Ermenonville Castle loop from Le Plessis-Belleville.
The spring and autumn months generally offer the most pleasant conditions for road cycling around Lagny-Le-Sec, with mild temperatures and beautiful scenery. Summer can also be enjoyable, especially when riding through the shaded forest routes like those in the Forêt d'Ermenonville, which provide relief from the heat.
Many routes, particularly those starting from towns like Le Plessis-Belleville, offer convenient parking options. It's advisable to check the specific route details on komoot for recommended starting points and parking information, as these are often located near the trailheads.
The road cycling routes around Lagny-Le-Sec are highly rated by the komoot community, with an average score of 4.8 stars from over 10 reviews. Cyclists often praise the varied terrain, the scenic woodlands, and the historical landmarks encountered along the way.
The Oise department, where Lagny-Le-Sec is located, actively promotes cycling tourism. You can find information on the 'Trans'Oise' greenway, which traverses the department, and the 'Oise Rando' application, which provides access to over 350 routes suitable for cycling throughout the region. For more information on cycling in the broader Chantilly-Senlis area, you can visit chantilly-senlis-tourisme.com.
Absolutely. Both the Forêt d'Ermenonville and the Forêt de Chantilly are key features of the road cycling landscape around Lagny-Le-Sec. Many routes are specifically designed to take you through these extensive and scenic wooded areas, offering a mix of oak, beech, and Scots pine on sandy soils. For example, the Ermenonville Castle – Chantilly Castle loop from Le Plessis-Belleville connects these two significant forest areas.


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