Fete d'Osny
The annual town festival brings residents together every summer with concerts, a fun fair, children's games and food stands in the town's green spaces.
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Osny
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ℹ️Practical info — Osny
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🌤 Weather — 5 days
📍 Nearby
Sights nearby
💡 Tips
- Visit the Château de Grouchy park early morning for the best light on the manor and the lake.
- The local bus network is integrated with Cergy-Pontoise, use a Navigo pass for seamless travel.
- Look out for the historic dovecote and the old mill along the Viosne river.
- Parking is generally free but limited around the town hall during weekday mornings.
🍽 Food
🍽
Traditional French crêpes
Find a local crêperie near the town center for a quick and authentic lunch.
🍽
Brie de Meaux
A regional cheese available at the local weekend market.
🍽
French pastries
Check out a traditional boulangerie on the main street for fresh croissants.
🛍 Shopping · 🧘 Quiet spots
🛍
Osny Market
A local open-air market for fresh produce and regional specialties.
🛍
Local bakeries
The central streets offer independent shops for everyday French delicacies.
🧘
Parc de Grouchy
A sprawling 42-hectare park with a pond, first-rate for a peaceful stroll.
🧘
Banks of the Viosne
A tranquil walking path running alongside the small river.
Water temperature…
Highlights of 2026
1
Located in the Val-d'Oise department on the edge of the Cergy-Pontoise agglomeration, Osny is a delightful town that has deep historical roots and an exceptionally green environment. The absolute centerpiece of the town is the magnificent Château de Grouchy, an elegant 18th-century manor that currently houses the town hall as well as a fascinating Firefighter Museum, the Musée Départemental des Sapeurs-Pompiers. The chateau is set within the expansive Parc de Grouchy, a striking landscaped park featuring a pretty lake, ancient trees, and sweeping lawns that invite visitors for long, relaxing strolls. Osny also holds a special place in art history: the renowned Impressionist painter Camille Pissarro was deeply inspired by the town tranquil landscapes and the gentle flow of the Viosne River, capturing the area beauty in several of his famous paintings. Wandering through the old town, you can discover quaint narrow streets, an old riverside mill, and the pleasant 12th-century Saint-Pierre-aux-Liens church. Osny wonderfully blends its rich cultural heritage, Impressionist art history, and the serene relaxation of beautifully maintained parklands.
- Location: Île-de-France, France
- Top sights: Grouchy Park · William Thornley Museum · Saint-Pierre-aux-Liens Church
- Nearby: Vauréal (4 km)
- Population: ~20.306
Best time to visit & climate
The most pleasant time to visit is Jun–Aug.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg °C | 3 | 4 | 7 | 10 | 13 | 17 | 19 | 19 | 15 | 12 | 7 | 4 |
| Rain mm | 56 | 50 | 54 | 41 | 65 | 58 | 55 | 58 | 42 | 61 | 64 | 71 |
Geography
Facts
- Grouchy Park size: 42 hectares
- River: La Viosne
- Church: Saint-Pierre-et-Saint-Paul
- Region: Île-de-France
- Population: 20,306
- Train Link: Transilien Line J
Explore nearby
Notable places around
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Sights in the town Osny (5)
Frequently asked questions
Is Parc de Grouchy in Osny free to visit?
Yes, the park surrounding the chateau is a public space and access is free for walkers.
How to get to Osny from Paris?
You can take the Transilien Line J train from Saint-Lazare station; the journey takes about 45 minutes.
Are there any museums in Osny?
The Grouchy Castle houses the William Thornley gallery, dedicated to the works of this post-impressionist painter.
Is Osny a family-friendly destination?
Absolutely, Parc de Grouchy gives large play areas and ponds, convenient for an afternoon with children.
When is the best time to visit Osny?
Spring and summer are handy for seeing the gardens and nature around the Vexin Français in full bloom.
Osny: where is it located?
Osny is located in Île-de-France, France.
Osny: what is there to see?
Highlights include Grouchy Park, William Thornley Museum, Saint-Pierre-aux-Liens Church.
Osny: when is the best time to visit?
The most pleasant time to visit is Jun, Aug.
Osny: why is it worth visiting?
Located in the Val-d'Oise department on the edge of the Cergy-Pontoise agglomeration, Osny is a delightful town that has deep historical roots and an exceptionally green environment.
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