Nature Festival in Seine-et-Marne 2026 (77): top ideas for free outings

The Festival of Nature 2026 comes to Seine-et-Marne (77) from May 20 to 25 for its 20th edition. Poetic strolls, nocturnal butterflies, living forests, and harriers in flight: here are the free outings and activities not to miss in the 77.

The Fête de la Nature is back in Paris and the Île-de-France region! From May 20 to 25, 2026, families and groups of friends are welcome to explore the parks, squares, and gardens of Paris and the surrounding area for a host of free activities open to everyone. This 20th edition is a chance to (re)discover the richness of our natural spaces and to recognize the importance of protecting them.

In Seine-et-Marne (77) too, the program is enticing and varied: discovery outings of the wetlands, poetic strolls in a Regional Nature Reserve, nighttime naturalist observations, an immersion in Fontainebleau’s forest ecosystem, and even encounters with the plains’ raptors. The lineup features biodiversity discovery, environmental awareness, and immersion in nature through walks accessible to all audiences. Guided by passionate instructors, kids and adults alike can explore the Espaces Naturels Sensibles (ENS) through forest, meadow, and wetland trails, wildlife and flora observations, hands-on educational and creative workshops, or beginners’ ornithology sessions. These activities offer a unique chance to discover preserved natural habitats, appreciate their beauty, and understand why it is vital to protect them. Here are the top picks!

Nature Festival 2026 in Seine-et-Marne (77): our picks

Nature Festival in Moret-Loing-et-Orvanne 2026, a festive and free weekend
La Fête de la Nature returns to Moret-Loing-et-Orvanne on May 23–24, 2026. Activities, workshops, a plant swap, a nature-themed concert and a nature village await you for a free weekend in the heart of Seine-et-Marne. [Read more]

In Marolles-sur-Seine : Birds nesting in the Carreau Franc Sensitive Natural Area, guided binocular and telescope observation on May 20 from 2:00 to 4:00 PM, organized by the Association des Naturalistes de la Vallée du Loing et du massif de Fontainebleau (ANVL). Throughout the seasons, common and rare species cross this site with a rich history. Booking required at www.anvl.fr.
In Montereau-Fault-Yonne : Easy, poetic guided walks in the Regional Natural Reserve of the Saint-Martin Hill and Rougeaux, on May 20 and 25 from 2:30 to 4:30 PM, organized by France Nature Environnement Seine-et-Marne with the City of Montereau-Fault-Yonne and the Lé Fé Plume Writing Workshop. A sensory stroll in nature designed to awaken all the senses, enlivened with poetic readings. Easy terrain and a relaxed pace, suitable for all. (Ground can be uneven for wheelchairs.) Kids welcome with an adult. Accessible to people with hearing, mental, and visual impairments. Bring sturdy walking shoes, weather-appropriate clothing, water, and a snack for children. Contact: 06 86 91 94 45.
In Choisy-en-Brie : A Meeting with the Marsh Harrier, on May 23 from 9:00 AM to 12:00 PM, organized by the association Pie Verte Bio 77. A morning focused on observing the three harrier species in Seine-et-Marne, protected raptors that nest on the ground in cereal fields. Binoculars and telescopes provided by volunteers. Not suitable for children. Weather-appropriate attire (hat, sunglasses, sunscreen) required. Reservation by email at pievertebio77@yahoo.fr.
In Gouaix : Nocturnal butterfly-watching at the Bassée Nature Reserve, on May 23 from 9:00 to 11:00 PM, organized by the Association for the Management of the Bassée Nature Reserve. An evening devoted to the nocturnal lepidoptera diversity. Booking required by Friday at 3:00 PM at the Reserve House: 01 64 00 06 23 or contact@reservelabassee.fr. Meeting point released a few days prior. Wear suitable footwear and clothing. No dogs accepted.
In Villenoy : 5th Nature Festival at Parc du Baron Pelet, on May 23 from 2:00 to 5:30 PM. A family-friendly day themed around "Flowers and Birds" with a batucada parade "All in Feathers" (from Rue de Lagny or Rue Pierre Mendès France), creative workshops about birds, a scrapbooking art exhibit, an introduction to composting, green waste bag distribution, and a garden-flower contest (with a gardening store gift certificate as a prize). Activities suitable for all ages start at 2:00 PM.
In Avon : Immersive workshop "My Forest is Alive!", on May 24 from 2:30 to 5:30 PM, organized by Etats Sauvages. A 3-hour forest outing from Fontainebleau Station to shift perception of the woods and learn how to support biodiversity, guided by the Potential Biodiversity Index (IBP) developed by INRAE and CNPF. A blend of knowledge sharing and hands-on exercises. Suitable for ages 14 and up. Registration required on the Etats Sauvages site.

Sign up, lace up good shoes, open your eyes and ears wide, and let a guide lead you along the trails of the Sensitive Natural Areas of Seine-et-Marne. Check out the full program of Nature Day 2026 in the 77 and across France, and be sure to book early for activities with limited spaces!

Who is the Fête de la Nature in Seine-et-Marne aimed at?

This annual gathering is equally suited to families with children (for daytime walks and activities) as to seasoned naturalists eager to follow in the footsteps of bustards or nocturnal butterflies. The Seine-et-Marne region, with its forests, nature reserves and agricultural plains, offers an ideal setting for this kind of exploration. For evening programs or birdwatching outings, plan to bring binoculars, sturdy footwear and an extra layer of clothing, depending on the forecast.

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