Mashomack Preserve

The Jewel of the Peconic

Mashomack Preserve is one of Long Island’s most significant conservation areas—a breathtaking 2,350-acre nature sanctuary that covers nearly a third of Shelter Island. Managed by The Nature Conservancy, Mashomack protects tidal creeks, mature oak woodlands, freshwater marshes, and open fields that form an ecological haven for birds, wildlife, and plant species. With over 11 miles of trails ranging from family-friendly to moderate difficulty, plus free admission and a welcoming visitor center, Mashomack is the essential nature experience for anyone visiting Shelter Island.

Conservation History & Significance

Mashomack Preserve represents decades of conservation effort to protect Shelter Island’s natural heritage. The preserve’s diverse habitats support hundreds of species, making it crucial for regional biodiversity. The Nature Conservancy manages the land with scientific expertise, balancing public access with resource protection. The preserve is particularly important for migratory bird species, serving as a critical stopover during spring and fall migrations. Birdwatchers from across the region visit specifically to observe the remarkable variety of species that depend on Mashomack’s habitats.

Trail System Overview

Mashomack’s 11+ miles of trails provide options for every fitness level and interest. The signature trail is the Red Trail (also called Mashomack Trail), a moderately challenging 7.5-mile loop that traverses the preserve’s most diverse habitats. The Blue, Yellow, and Green trails offer shorter, family-friendly options ranging from 1 to 3 miles, perfect for those with children or limited time. All trails are well-maintained and clearly marked. Maps are available at the visitor center or downloadable from The Nature Conservancy website.

Red Trail (Mashomack Trail) — 7.5 miles, Moderate

This comprehensive loop takes you through the full spectrum of Mashomack’s ecosystems—from oak woodlands to tidal creeks to open meadows. You’ll encounter multiple viewpoints overlooking the water and pass through areas where wildlife sightings are common. The moderate difficulty involves some elevation changes and uneven terrain. Most hikers complete the full loop in 2.5 to 3.5 hours, though you can shorten it by cutting across at various points. This is the trail for experiencing the full richness of Mashomack.

Blue, Yellow & Green Trails — 1 to 3 miles, Family-Friendly

These shorter trails provide excellent introductions to Mashomack’s natural beauty without requiring extensive time commitment. They’re well-suited for families with children, casual walkers, and those seeking a gentler pace. Each offers different perspectives and habitats, so consider exploring multiple trails if you have time.

What You’ll See: Flora & Fauna

Mashomack’s diverse habitats support an impressive array of wildlife and plants. Oak woodlands provide shade and acorns that sustain populations of deer and other mammals. Tidal creeks host fish, crustaceans, and wading birds. Freshwater marshes and ponds attract waterfowl, dragonflies, and amphibians. Open fields support nesting birds and wildflowers. Depending on the season, you might observe great blue herons, osprey, bald eagles (especially in winter), white-tailed deer, painted turtles, and numerous songbird species. Spring and fall migrations bring waves of species passing through—birdwatchers bring field guides and binoculars to document sightings.

Hours & Seasonal Information

Mashomack Preserve is generally open during the following hours:

• March – September: 9am–5pm daily (closed Tuesdays, except July & August when open daily)
• October – February: 9am–4pm daily (closed Tuesdays)
• January: Weekends only

These hours may vary seasonally or due to special circumstances, so call ahead or check the Nature Conservancy website before your visit.

Visitor Center

The Mashomack Visitor Center serves as a wonderful starting point for your preserve visit. Open Thursday–Saturday from 10am–3pm, the center features exhibits about the preserve’s ecology, conservation efforts, and wildlife. Staff and volunteers can answer questions, provide trail recommendations tailored to your interests and fitness level, and share current wildlife sightings and seasonal highlights. The center also has restrooms, water, and trail maps.

Location & Getting There

Mashomack Preserve is located at 79 South Ferry Road, just minutes from the South Ferry landing in Shelter Island. From either ferry terminal, follow signs to the South Ferry Road area. The preserve entrance is well-marked. Coming from the North Ferry, the drive is approximately 15 minutes. If you’re staying on Shelter Island Heights, it’s even closer—roughly 10 minutes. GPS coordinates are available for those using navigation apps, but printed directions from your accommodations are often helpful.

Free Admission & Donations

One of Mashomack Preserve’s greatest gifts is its free admission policy. Anyone can walk the trails without paying an entry fee—this reflects The Nature Conservancy’s commitment to public access to nature. That said, the preserve depends on donations and membership to support its conservation work, staff, and trail maintenance. Consider making a donation in the visitor center or supporting The Nature Conservancy if Mashomack’s mission resonates with you.

What to Bring & How to Prepare

For any Mashomack visit, bring adequate water—trails can be warm and you’ll need hydration. Comfortable hiking boots or shoes with good ankle support are essential, as trails can be uneven and muddy after rain. Insect repellent helps during warmer months when mosquitoes and biting flies may be active. Binoculars and a field guide to birds are invaluable for wildlife observation. Bring a camera or smartphone for photography. A light jacket is useful even in summer, as the preserve can feel cool under the dense forest canopy.

Best Seasons for Visiting

Each season offers distinct advantages:

• Spring (April-May): Migrating birds are abundant, wildflowers bloom, and temperatures are comfortable. Peak birding season.
• Summer (June-August): Longest hours (open daily), lush vegetation, nesting birds. Can be warm and buggy.
• Fall (September-October): Returning migrants, fall colors, pleasant temperatures. Excellent hiking weather.
• Winter (November-February): Quieter crowds, bald eagles present. Muddy trails and limited hours (weekends only in January).

Contact Information

For more information about Mashomack Preserve, contact The Nature Conservancy at 631-749-1001. The preserve also maintains an informative website with detailed trail maps, wildlife guides, and current conditions. Email inquiries can be directed through The Nature Conservancy’s main contact page.

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