Nuit des Étoiles Ermenonville
Astronomical observation and scientific activities at Parc Jean-Jacques Rousseau
2026
There is no edition scheduled in 2026 for this event. This page remains accessible to archive the history of the manifestation and will be updated if a new edition is announced.
About Nuit des Étoiles
The Nuit des Étoiles in Ermenonville is a popular astronomy event held at the Parc Jean-Jacques Rousseau in the Oise department, as part of the national Nuits des Étoiles organized by the French Astronomy Association. There will be no event held at the park in 2026. Past editions featured telescope observations, a planetarium, family workshops, and lectures, all set within the 18th-century landscaped garden created by the Marquis de Girardin.
Our team has not been able to confirm with an official source that this 2026 edition is taking place. The dates and program shown below may be outdated. We strongly recommend that you contact the organizer directly to verify before any travel or registration.
Nuit des Étoiles — edition 2026
ℹ️ No event at the park in 2026. The Parc Jean-Jacques Rousseau in Ermenonville is not hosting a Nuit des Étoiles this year.
The 36th annual Nuits des Étoiles, organized by the French Astronomy Association, will take place from August 7 to 9, 2026, with the Sun as this year's theme. Public observation sites are listed at afastronomie.fr; several clubs and associations will be welcoming visitors across the Hauts-de-France region.
The park remains open for visits during its regular summer hours and offers other events throughout the season.
Highlights Nuit des Étoiles 2026
- No Nuit des Étoiles at the Parc Jean-Jacques Rousseau in 2026
- National Nuits des Étoiles from August 7 to 9, 2026, theme: the Sun
- Observation sites listed by the French Astronomy Association
Programme Nuit des Étoiles 2026
Prices Nuit des Étoiles 2026
Practical information — Nuit des Étoiles
Access and Transport
By Car: Ermenonville is accessible via the N330 from Senlis (approx. 10 min) or via the A1 motorway (exit 8 Senlis, then follow signs for Ermenonville via the D330). Parc Jean-Jacques Rousseau has a car park near the entrance. Traveling by car is highly recommended, as Ermenonville is a rural commune poorly served by public transport.
By Train: The nearest stations are Senlis (accessible by bus from Chantilly-Gouvieux, RER D) and Crépy-en-Valois (TER from Paris-Nord). From these stations, travel by taxi or car is necessary (approx. 15 min). Carpooling is encouraged.
Practical Information
Location: Parc Jean-Jacques Rousseau, 60950 Ermenonville. This 18th-century landscaped park, covering 65 hectares, is one of France's first romantic gardens. It is where Jean-Jacques Rousseau spent the last weeks of his life in 1778.
Dates and Times
The event takes place on the first weekend of August (Friday, Saturday, Sunday), as part of the national Nuits des Étoiles organized by the Association Française d'Astronomie. Activities start at 4 PM and continue until 1 AM for night observations. The detailed program is published on the Ermenonville town website a few weeks before the event.
Prices
Entrance to Parc Jean-Jacques Rousseau is subject to a fee (park entrance fee, check the website for updated prices). Astronomical activities (planetarium, observations, workshops) are included in the park entrance fee. The "Petite Ourse" workshop for children aged 9 to 13 may require prior registration and an additional fee.
Recommended Equipment
Bring warm clothing for night observations (even in August, temperatures drop at night in the park). A red-light headlamp is useful for moving around without disturbing observations. If you own binoculars, bring them for sky observation. A ground mat or deck chair can be brought for comfortable stargazing while lying down.
Park Opening Hours
Parc Jean-Jacques Rousseau is open from April 1st to October 29th. In July-August: from 10 AM to 8 PM (extended hours during the Nuits des Étoiles for night observations).
Contact
Parc Jean-Jacques Rousseau – Commune d'Ermenonville – Website: www.ermenonville.fr
Association Française d'Astronomie – Website: www.afastronomie.fr
ℹ️ No event in 2026. The Nuit des Étoiles will not be held at the Parc Jean-Jacques Rousseau in Ermenonville this year. However, the national Nuits des Étoiles will take place from August 7th to 9th, 2026: the French Astronomy Association provides a list of public observation sites across France.
The Nuit des Étoiles in Ermenonville
The Parc Jean-Jacques Rousseau in Ermenonville has previously hosted stargazing evenings in early August as part of the Nuits des Étoiles. Far from the light pollution of major cities, this landscaped park in the Oise region provided an ideal setting for the event.
The Parc Jean-Jacques Rousseau
Created in the 18th century by the Marquis de Girardin, the Parc Jean-Jacques Rousseau is one of France's first landscaped gardens. The philosopher Jean-Jacques Rousseau spent the final weeks of his life here. Its lawns and clearings, away from urban light sources, offer excellent conditions for observing the night sky. The park, owned by the Oise Department, remains open to visitors and hosts other events throughout the year.
What past editions offered
Depending on the year, the evenings at the park featured a planetarium, telescope observations guided by amateur and professional astronomers, introductory courses—including the AFA's "Petite Ourse" certification for 9-13 year olds—scientific and artistic family workshops, stage lectures, and digital shows.
Where does it take place — Nuit des Étoiles
Nuit des Étoiles in brief
History of Nuit des Étoiles
Edition 2025 Aug 2025Other festivals near Ermenonville
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