4.4
(134)
1,047
riders
99
rides
No traffic touring cycling routes around Oncy-Sur-École traverse a diverse landscape within the Gâtinais Français Regional Natural Park. The area features the gentle, flat paths along the École River, contrasting with the more varied terrain and ascents found in the Mount Grippon massif. Cyclists can expect to encounter extensive woodlands, agricultural lands, and traditional rural architecture, providing a constantly changing backdrop for rides. This region offers a network of trails suitable for various skill levels, from leisurely riverside routes to…
Last updated: August 28, 2026
5.0
(2)
85
riders
49.6km
04:20
410m
410m
Moderate bike ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
4.5
(4)
20
riders
34.9km
03:07
290m
290m
Moderate bike ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.

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4.3
(3)
15
riders
Easy bike ride. Great for any fitness level. Mostly paved surfaces. Suitable for all skill levels.
4.7
(3)
11
riders
33.1km
02:00
130m
130m
Moderate bike ride. Good fitness required. Mostly paved surfaces. Suitable for all skill levels.
5.0
(1)
10
riders
31.2km
02:40
260m
260m
Hard bike ride. Good fitness required. You may need to push your bike for some segments of this route.
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Popular around Oncy-Sur-École
Very sandy, we had to get off our bikes
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Former market square in the heart of Milly-la-Forêt.
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The cyclops visit is not free, 12 euros entry but it lasts 45 minutes and is very interesting. Limit of 25 people at a time. Please note that photos inside are prohibited. I recommend the first visit at 10:30 a.m. (less crowded)
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The trail moves on to the main essentials The hall In 1479, by a special grace from Louis The North-South facing Hall, 46 m long, 16 m wide and 13 m high, covers a total surface area of 730 m2. 48 oak pillars, resting on “dice”-cut stone bases, support a chestnut frame typical of Ile-de-France at that time; this frame presents to the north (on the rue Langlois side) a “pavilion” farm. Today, La Halle is still the site of a market on Thursday afternoons. The square, the houses gathered all around, bear witness to the great commercial activity which already reigned in the region 500 years ago. La Halle has been classified as a Historic Monument since 1923. Bonde Castle is located near the town center of Milly-la-Forêt, Built near an artificial island in the l'École river to the west of the Notre-Dame collegiate church, its park is bordered to the west by the course of the river which forms a moat to the north protecting the châtelet. History Built in the 12th century by the lords of Milly, the castle was ruined during the English siege in 1432. At the end of the 15th century around 1475, owned by Admiral Louis Malet de Graville, it was rebuilt and enlarged. What was then the keep became the entrance gatehouse, the drawbridge was replaced by a permanent stone bridge and a gate closed access between the northern defense tower and the governor's house. A square courtyard was surrounded by a wall and had in the center a chapel dedicated to Saint Valentine. The castle was successively the property of Hugues III de Bouville, Olivier V de Clisson, Jean II de Montmorency, Jean-François de Faudoas d'Averton, Marc-Antoine Front de Beaupoil de Saint-Aulaire and Pierre Marie of Lau d’Allemans. In the 19th century, the towers of the chatelet were enhanced with brick battlements and a slender roof. In 1859 the Corne bridge was rebuilt near the castle washhouse which served as a watering trough for the animals. At the end of the 20th century the mills along the river were demolished. In 1964, the Bonde washhouse downstream of the river which was part of the estate was rehabilitated. On December 20, 1972, the castle was partly listed as a historic monument. The park was listed in 1991 for its fences, canals and paths. the house of Jean Cocteau. Entrance to the J. Cocteau house [This 17th century residence, flanked by turrets, was formerly called the Governor's House. It corresponds to an old outbuilding of the castle in front of which the vassals came to pay homage and faith to their lord. Jean Cocteau bought this house with Jean Marais in 1947 and lived there until his death. Notre-Dame de l’Assomption Church Founded in the 11th century, the former chapel of the castle, it was rebuilt around 1485 on the orders of Admiral de Graville in the Gothic style of the 13th and 14th centuries. The bell tower, 57 meters high, dates from the 11th century in its lower part and from the 12th and 13th centuries in its upper part. The arch of the main portal in the primitive Romanesque style comes from an old church in Milly (Saint-Pierre or Saint-Jacques). On the east side of the bell tower - Place Grammont side - the arms of Admiral de Graville are still visible. Many works of sacred art are found inside the church. The church was listed as a Historic Monument in 1926. The dovecote; Located on the old triangular square of the dovecote cul de sac, this old building was part of the Domaine du Moustier, property of Fulbert I, lord of Milly and officer at the court of Dagobert I in the 7th century. Destroyed in 1432 or 1433, the complex included a vast farm. According to a count in 1792 it had around 1200 niches. Only the lords held the right to build these premises designed for breeding. The Moustier de Péronne gate is one of the oldest vestiges of Milly and dates from the 7th century. It provided access to the moustier (monastery in old French) owned by Fulbert I, who obtained the land of Milly from Dagobert I. His son Wulfran was born there around the year 635. Entering religion, he became the apostle of the frieze (Netherlands), then bishop of Sens before retiring to Saint Wandrille where he died in 720.
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The 25 Bosses circuit is both an unparalleled adventure site for the Paris region and a meeting place for trail, hiking and climbing enthusiasts. The route of the trail is wonderfully well thought out, it offers superb technical sections that make walking (or running) very fun. Some passages require bending down, pulling yourself up, getting on all fours. Watch out for backpacks and trash pads for those who come to climb.
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There are nearly 100 no-traffic touring cycling routes around Oncy-Sur-École, offering a wide range of options for all skill levels. You'll find 36 easy routes, 43 moderate routes, and 18 more challenging options.
The terrain varies significantly. You can find picturesque, flat routes along the École River, ideal for leisurely rides. However, the Mount Grippon massif also offers more challenging routes with notable ascents and descents, such as the 47.9 km Coquibus Pond – Platière de Coquibus loop with over 400m of elevation gain.
Yes, Oncy-Sur-École and the surrounding Gâtinais Français Regional Natural Park offer several easy, low-traffic routes perfect for families and beginners. An example is the Oncy-sur-École MTB Loops loop from Milly-la-Forêt, which is just under 15 km with minimal elevation, providing a gentle introduction to the area's beauty.
The region is rich in natural beauty. You'll cycle through diverse ecosystems within the Gâtinais Français Regional Natural Park, including woodlands and agricultural lands. Keep an eye out for the picturesque École River and the rocky slopes of Mount Grippon. For a dedicated scenic spot, consider routes that pass by the Panorama – Viewpoint over the forest loop from Milly-la-Forêt.
Absolutely. Many of the no-traffic touring cycling routes around Oncy-Sur-École are designed as circular loops, allowing you to start and finish at the same point. Examples include the challenging Coquibus Pond – Platière de Coquibus loop and the moderate Cul du Chien Rock – Beautiful forest loop.
The area boasts a rich cultural heritage. You can explore historical sites like the 11th-century Church of Saint-Martin in Oncy-Sur-École. Nearby, you might encounter castles such as Fleury-en-Bière Castle or Domaine de Courances, and even the La Bonde Castle, which is accessible via a wooden pathway from Oncy.
The area is highly rated by the komoot community, with an average score of 4.4 stars from over 120 reviews. Cyclists often praise the tranquility of the car-free paths, the diverse landscapes ranging from riverside to forest, and the charming rural character of the villages within the Gâtinais Français Regional Natural Park.
For a moderate yet rewarding ride, consider the Oncy-sur-École MTB Loops – Noisy-sur-École Village loop. This route covers approximately 25 km with around 126m of elevation gain, offering a pleasant journey through varied scenery without being overly strenuous.
Given the rural nature of Oncy-Sur-École and its proximity to Milly-la-Forêt, you can typically find parking in or near the village centers. Many routes, like the Oncy-sur-École MTB Loops loop from Milly-la-Forêt, start from nearby towns, offering convenient access points.
Oncy-Sur-École is a rural commune in Île-de-France. While direct public transport options might be limited, it's advisable to check local bus services connecting to larger towns like Milly-la-Forêt, which may offer more frequent connections. For detailed information on local transport, you might consult the official tourism website for the area, such as Milly-la-Forêt Tourism.
Spring and autumn generally offer the most pleasant conditions for touring cycling in Oncy-Sur-École. The weather is typically mild, and the natural landscapes of the Gâtinais Français Regional Natural Park are particularly beautiful with blooming flora or vibrant autumn colors. Summer can also be enjoyable, but it's best to cycle in the mornings or late afternoons to avoid the midday heat.


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