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France
Ile-de-France
Pontoise
Boissy-L'Aillerie

Château de Montgeroult – Château de Saint-Cyr loop from Boissy-l'Aillerie

Routes
Road cycling routes
France
Ile-de-France
Pontoise
Boissy-L'Aillerie

Château de Montgeroult – Château de Saint-Cyr loop from Boissy-l'Aillerie

Intermediate

6

riders

Château de Montgeroult – Château de Saint-Cyr loop from Boissy-l'Aillerie

02:42

58.3km

480m

Intermediate road ride. Good fitness required. Mostly well-paved surfaces and easy to ride. The starting point of the route is accessible with public transport.

Last updated: October 23, 2025

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Waypoints

A

Start point

Train Station

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1

2.23 km

Château de Montgeroult

Highlight • Castle

A charming village on the slopes of the Viosne with its castle and adjacent church.

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2

6.66 km

Pretty house in Cormeille en Vexin

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Very pretty village in the heart of Vexin. Many typical houses of the region bring a bucolic side.

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3

9.14 km

The roads of Vexin

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Magnificent route perfect to apprehend the Vexin with its fields as far as the eye can see.

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4

18.0 km

Chateau ✨

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Very beautiful castle in the calm of the Vexin countryside

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5

18.0 km

Château de Saint-Cyr

Highlight • Castle

Magnificent estate, lost in the middle of nowhere.

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6

51.2 km

Gare d'Us, a welcoming third place

Highlight • Other

Trains still stop in Us, but like many small towns, the station and its ticket office have been deserted and are no longer used. A great initiative has fortunately brought …

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7

55.5 km

Lavoir de Courcelles-sur-Vione

Highlight • Other

A beautiful piece of nature, the building opposite the wash house has a magnificent architecture.

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B

58.3 km

End point

Train Station

Way Types & Surfaces

Way Types

39.8 km

13.2 km

4.05 km

454 m

441 m

327 m

Surfaces

43.9 km

14.3 km

< 100 m

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Elevation

Elevation

Highest point (170 m)

Lowest point (40 m)

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Saturday 25 October

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Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.

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How to understand each route’s difficulty level

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Easy
Up to 2 hours and 1,000 ft. of elevation gain. Great for any fitness level.Easily-accessible paths. Suitable for all skill levels.
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Intermediate
Up to 5 hours and 3,000 ft. of elevation gain. Requires good fitness.Mostly accessible paths. Sure-footedness required.
Corresponds approx. to SAC 2-3.
Expert
More than 5 hours long or 3000 ft. of elevation gain. Requires very good fitness.Sure-footedness, sturdy shoes and alpine experience required.
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Technical difficulty rating based on the Swiss Alpine Club (SAC) Hiking Scale.
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Easy
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Corresponds approx.to SAC 1.
Intermediate
Up to 5 hours and 3,000 ft. of elevation gain. Requires good fitness.Mostly accessible paths. Sure-footedness required.
Corresponds approx. to SAC 2-3.
Expert
More than 5 hours long or 3000 ft. of elevation gain. Requires very good fitness.Sure-footedness, sturdy shoes and alpine experience required.
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Technical difficulty rating based on the Swiss Alpine Club (SAC) Hiking Scale.
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How to understand each route’s difficulty level

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Mountain Bike

Road Bike

Running

Easy
Up to 2 hours and 1,000 ft. of elevation gain. Great for any fitness level.Easily-accessible paths. Suitable for all skill levels.
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Intermediate
Up to 5 hours and 3,000 ft. of elevation gain. Requires good fitness.Mostly accessible paths. Sure-footedness required.
Corresponds approx. to SAC 2-3.
Expert
More than 5 hours long or 3000 ft. of elevation gain. Requires very good fitness.Sure-footedness, sturdy shoes and alpine experience required.
Corresponds approx. to SAC 4–6.
Technical difficulty rating based on the Swiss Alpine Club (SAC) Hiking Scale.
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How to understand each route’s difficulty level

Hiking

Bike

Mountain Bike

Road Bike

Running

Easy
Up to 2 hours and 1,000 ft. of elevation gain. Great for any fitness level.Easily-accessible paths. Suitable for all skill levels.
Corresponds approx.to SAC 1.
Intermediate
Up to 5 hours and 3,000 ft. of elevation gain. Requires good fitness.Mostly accessible paths. Sure-footedness required.
Corresponds approx. to SAC 2-3.
Expert
More than 5 hours long or 3000 ft. of elevation gain. Requires very good fitness.Sure-footedness, sturdy shoes and alpine experience required.
Corresponds approx. to SAC 4–6.
Technical difficulty rating based on the Swiss Alpine Club (SAC) Hiking Scale.
Easy

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How to understand each route’s difficulty level

Hiking

Bike

Mountain Bike

Road Bike

Running

Easy
Up to 2 hours and 1,000 ft. of elevation gain. Great for any fitness level.Easily-accessible paths. Suitable for all skill levels.
Corresponds approx.to SAC 1.
Intermediate
Up to 5 hours and 3,000 ft. of elevation gain. Requires good fitness.Mostly accessible paths. Sure-footedness required.
Corresponds approx. to SAC 2-3.
Expert
More than 5 hours long or 3000 ft. of elevation gain. Requires very good fitness.Sure-footedness, sturdy shoes and alpine experience required.
Corresponds approx. to SAC 4–6.
Technical difficulty rating based on the Swiss Alpine Club (SAC) Hiking Scale.
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How to understand each route’s difficulty level

Hiking

Bike

Mountain Bike

Road Bike

Running

Easy
Up to 2 hours and 1,000 ft. of elevation gain. Great for any fitness level.Easily-accessible paths. Suitable for all skill levels.
Corresponds approx.to SAC 1.
Intermediate
Up to 5 hours and 3,000 ft. of elevation gain. Requires good fitness.Mostly accessible paths. Sure-footedness required.
Corresponds approx. to SAC 2-3.
Expert
More than 5 hours long or 3000 ft. of elevation gain. Requires very good fitness.Sure-footedness, sturdy shoes and alpine experience required.
Corresponds approx. to SAC 4–6.
Technical difficulty rating based on the Swiss Alpine Club (SAC) Hiking Scale.
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How to understand each route’s difficulty level

Hiking

Bike

Mountain Bike

Road Bike

Running

Easy
Up to 2 hours and 1,000 ft. of elevation gain. Great for any fitness level.Easily-accessible paths. Suitable for all skill levels.
Corresponds approx.to SAC 1.
Intermediate
Up to 5 hours and 3,000 ft. of elevation gain. Requires good fitness.Mostly accessible paths. Sure-footedness required.
Corresponds approx. to SAC 2-3.
Expert
More than 5 hours long or 3000 ft. of elevation gain. Requires very good fitness.Sure-footedness, sturdy shoes and alpine experience required.
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Technical difficulty rating based on the Swiss Alpine Club (SAC) Hiking Scale.
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How to understand each route’s difficulty level

Hiking

Bike

Mountain Bike

Road Bike

Running

Easy
Up to 2 hours and 1,000 ft. of elevation gain. Great for any fitness level.Easily-accessible paths. Suitable for all skill levels.
Corresponds approx.to SAC 1.
Intermediate
Up to 5 hours and 3,000 ft. of elevation gain. Requires good fitness.Mostly accessible paths. Sure-footedness required.
Corresponds approx. to SAC 2-3.
Expert
More than 5 hours long or 3000 ft. of elevation gain. Requires very good fitness.Sure-footedness, sturdy shoes and alpine experience required.
Corresponds approx. to SAC 4–6.
Technical difficulty rating based on the Swiss Alpine Club (SAC) Hiking Scale.
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How to understand each route’s difficulty level

Hiking

Bike

Mountain Bike

Road Bike

Running

Easy
Up to 2 hours and 1,000 ft. of elevation gain. Great for any fitness level.Easily-accessible paths. Suitable for all skill levels.
Corresponds approx.to SAC 1.
Intermediate
Up to 5 hours and 3,000 ft. of elevation gain. Requires good fitness.Mostly accessible paths. Sure-footedness required.
Corresponds approx. to SAC 2-3.
Expert
More than 5 hours long or 3000 ft. of elevation gain. Requires very good fitness.Sure-footedness, sturdy shoes and alpine experience required.
Corresponds approx. to SAC 4–6.
Technical difficulty rating based on the Swiss Alpine Club (SAC) Hiking Scale.
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How to understand each route’s difficulty level

Hiking

Bike

Mountain Bike

Road Bike

Running

Easy
Up to 2 hours and 1,000 ft. of elevation gain. Great for any fitness level.Easily-accessible paths. Suitable for all skill levels.
Corresponds approx.to SAC 1.
Intermediate
Up to 5 hours and 3,000 ft. of elevation gain. Requires good fitness.Mostly accessible paths. Sure-footedness required.
Corresponds approx. to SAC 2-3.
Expert
More than 5 hours long or 3000 ft. of elevation gain. Requires very good fitness.Sure-footedness, sturdy shoes and alpine experience required.
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Technical difficulty rating based on the Swiss Alpine Club (SAC) Hiking Scale.
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How to understand each route’s difficulty level

Hiking

Bike

Mountain Bike

Road Bike

Running

Easy
Up to 2 hours and 1,000 ft. of elevation gain. Great for any fitness level.Easily-accessible paths. Suitable for all skill levels.
Corresponds approx.to SAC 1.
Intermediate
Up to 5 hours and 3,000 ft. of elevation gain. Requires good fitness.Mostly accessible paths. Sure-footedness required.
Corresponds approx. to SAC 2-3.
Expert
More than 5 hours long or 3000 ft. of elevation gain. Requires very good fitness.Sure-footedness, sturdy shoes and alpine experience required.
Corresponds approx. to SAC 4–6.
Technical difficulty rating based on the Swiss Alpine Club (SAC) Hiking Scale.
Intermediate

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How to understand each route’s difficulty level

Hiking

Bike

Mountain Bike

Road Bike

Running

Easy
Up to 2 hours and 1,000 ft. of elevation gain. Great for any fitness level.Easily-accessible paths. Suitable for all skill levels.
Corresponds approx.to SAC 1.
Intermediate
Up to 5 hours and 3,000 ft. of elevation gain. Requires good fitness.Mostly accessible paths. Sure-footedness required.
Corresponds approx. to SAC 2-3.
Expert
More than 5 hours long or 3000 ft. of elevation gain. Requires very good fitness.Sure-footedness, sturdy shoes and alpine experience required.
Corresponds approx. to SAC 4–6.
Technical difficulty rating based on the Swiss Alpine Club (SAC) Hiking Scale.
Expert

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