Trails are open 7 days a week, from dawn to dusk.

The Visitor Center Exhibits are open Thursday – Saturday, from 10 a.m. – 3 p.m.
Visitor Center Bathrooms open daily, 8 a.m. – 6 p.m.


Please note this schedule is subject to change as we closely follow Covid community levels for Suffolk County.
© Rebecca Kusa/TNC

March 2023 on the Preserve

As winter gives one last hoorah, the plants and animals of Mashomack are readying for spring.  Enjoy this change of seasons on the trail or at one of our upcoming programs! See below for a list of this month’s opportunities.

Upcoming Programs 


Rare, Big and Odd Tree Tour at Mashomack 
Date: Sunday, March 5th, 10 a.m. – 12 p.m. 


Mashomack’s forest harbors some unique and rare trees. Come explore Mashomack by truck and on foot to witness the survivors of devastating diseases, colonization and turbulent weather. We’ll view different forest types and find very tall tulip trees, a huge white oak, a healthy elm tree and an American Chestnut. Bring your camera and be prepared for off-trail hiking. Advanced registration is required. 


Saturday Seedlings: Spring Has Sprung!  

Saturday, March 25th, 9 a.m. – 10 p.m.

Let’s celebrate spring! Join us at Mashomack as we explore the seasonal transition from winter into spring. Activities will include crafts, snacks and/or exploring our trails. Ages 4-8. Advanced registration is required.


Full Moon Walk: First Full Moon of Spring 

Thursday, April 6th, 7 PM – 8:30 p.m. 

Join us for this rare opportunity to experience the beauty of Mashomack at night. The first full moon of Spring will light our way on the trails as we take a walk through the forest. Learn about the seasonal changes unique to the east end of Long Island with members of our team. Advanced registration is required. 


Saturday Seedlings: April Showers 

Saturday, April 15th, 9 a.m. – 10 p.m. 

Join us at Mashomack as we investigate why April showers are so important for the plants and animals of Mashomack.  Activities will include crafts, snacks and/or exploring our trails. Ages 4-8. Advanced registration is required. 


Celebrate Earth Day at Mashomack 

Saturday, April 22nd, 10 a.m. – 3 p.m. (all-day/drop-in) 

Come and celebrate our love for the Earth! Drop in for crafts, snacks, readings, nature activities and more!

No RSVP required.


To reserve your spot in any of the above programs, please email MashomackPreserve@tnc.org


Save the Date! 

Mashomack’s Environmental Explorers returns this summer! This active, hands-on program is for kids ages 8-12. Online registration will begin in mid-March. Watch your inbox for a special registration announcement soon! Registrations will not be accepted before that time.
Session 1: July 10th – July 13th
Session 2: July 31st – August 3rd
Session 3: August 14th – August 17th

© Rebecca Kusa/TNC

March book in the Woods 

And Then It’s Spring by Julie Fogliono 

Following a snow-filled winter, a young boy and his dog decide that they’ve had enough of all that brown and resolve to plant a garden. They dig, they plant, they play, they wait . . . and wait . . . until at last, the brown becomes a more hopeful shade of brown, a sign that spring may finally be on its way.


Who Is Conservation? 


Removing barriers for women working in the environmental field will only make

conservation as a whole more effective. 

Find Out More Here 



Click on trail map to download. 



The Nature Conservancy works across New York, the United States and in 79 countries and territories to conserve the lands and waters on which all life depends. Learn more about our work at nature.org/NewYork

Join us today 


Copyright (C) 2021 The Nature Conservancy. All rights reserved. 


The Nature Conservancy
79 South Ferry Rd
PO Box 850
Shelter Island, New York 11964



AAQ / Resource: Stelle Lomont Rouhani Architects