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


The Visitor Center Exhibits are open Thursday – Saturday, from 10 AM – 3 PM


Visitor Center Bathrooms open daily, 8 AM – 6 PM

Please note this schedule is subject to change as we closely follow Covid community levels for Suffolk County.


© Rebecca Kusa/TNC
Visitors young and old celebrated Earth Day at Mashomack
on April 22nd.

May at Mashomack 

Spring is in full swing at Mashomack and is bringing new additions to the preserve. We are excited to announce the creation of a new teaching and learning pavilion in the Visitor Center area! Soon to be outfitted with accessible benches and tables, the pavilion will house classes, groups and other events outside in nature while being sheltered from the sun or rain. 

We have lots of upcoming opportunities for you to join us at the preserve! Come and spot some migratory warblers and other species of birds during a bird walk, volunteer with us, or join us and other community members during our May Celebration Picnic. See below for a full list of events! 


May Programs


Saturday Seedlings: May Flowers
(*NEW DATE*) Date: Saturday, May 6th,
9 AM – 10 AM 

April showers bring May flowers! Join us at Mashomack as we explore spring blooms all around us. Activities will include crafts, snacks and/or exploring our trails. Ages 4-8. Advanced registration is required. 


Migratory Bird Walk
Date: Saturday, May 13th, 8 AM – 10 AM
(*Rain Date: Sunday, May 14th, 8 AM – 10 AM)

May is the height of migration for colorful warblers. Join expert birders Dick and Beth Cartwright to find and identify birds and enjoy a walk in the woods and beside the bay! Bring binoculars. Beginners to experts welcome.  Advanced registration is required.


Volunteer Spring Welcome
Date: Saturday, May 20th, 10:30 AM – 12 PM
Whether you’re a returning volunteer or want to stop by and learn about the opportunities we have, we invite you to Mashomack for our Spring Volunteer Welcome! Light refreshments will be provided.


Mashomack Community Listening Session – Building Partnerships
Date: Saturday, May 13th, 10 AM – 11:30 AM
Join the Mashomack team to learn, listen and discuss how Mashomack can continue to be a resource for the community and contribute to the mission and goals of The Nature Conservancy. Light refreshments will be provided.
Zoom Option: May 18th, 7 PM – 8:30 PM. Please use this Zoom link to register.


Celebration Picnic at Mashomack Manor House
Date: Sunday, May 28th, 4 PM – 6 PM
Bring a picnic and blanket or chair. Come celebrate the coming of summer, meet our team and explore Mashomack! Join us for lawn games, music, hand-seining at Bass Creek, educational activities and more.

To reserve your spot in any of the above programs, please email MashomackPreserve@tnc.org or check back for more information at Nature.org/events in the coming weeks.


Spots Still Left!

Mashomack’s Environmental Explorers returns again this summer! This active, hands-on program is for kids ages 8-12. You can register online at nature.org/events.
Session 1: July 10th – July 13th
Session 2: July 31st – August 3rd
Session 3: August 14th – August 17th 

© Sarah Lewis


May Book in the Woods 

When the Shadbush Blooms, Carla Messinger with Susan Katz
Illustrated by striking paintings, this gentle story follows two Native American girls from different times—nearly four hundred years apart—as they each describe their family’s lives through the seasons. 


Let’s Talk Climate

The biggest thing you can do to help solve climate change? Talk about it. Learn how to start the climate conversation.

Download the Guide





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


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

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



AAQ / Resource: Stelle Lomont Rouhani Architects