Avalon Nature Preserve in Stony Brook: Trails and Hours
Avalon Nature Preserve covers 216 protected acres on the north shore of Long Island, with 140 of them open to visitors. Fields, forest, a mill pond and shoreline views over Stony Brook Harbor fill the grounds, and the preserve is free to enter. This guide summarizes what the preserve’s official website publishes about trails, hours, rules and programs, along with notes for a late-autumn visit.
Address, hours and admission
The preserve is at 200 Harbor Road, Stony Brook, NY 11790, and the telephone number on the official site is 631-689-0619. Admission is free and the grounds are open to the public year-round, except on Mondays, when the preserve is closed.
Opening hours change with the seasons. The home page lists 7 AM to 7 PM for April and May, 6 AM to 8 PM for June through August, 7 AM to 7 PM for September and October, and 7 AM to 5 PM from November through March. The shift to winter hours falls just after the end of October, which matters for anyone planning a late-afternoon walk in November, when the grounds close two hours earlier than in the fall.
Parking and current notices
The General Info page names several places to park: along Main Street, on Harbor Road, in the shopping center just past the preserve on Main Street, and on Shep Jones Lane, which it identifies as the access point for the Forest Sanctuary. The home page adds that parking on Shep Jones Lane is allowed only in designated lots, with a warning that violators will be ticketed.
Two notices on the home page affect routes. Access to the lower Coastal Corridor, described as the boardwalk and Mill Pond area, was listed as closed to visitors, and the boardwalk entrance at Harbor Road was closed because of damage. The page directs visitors to enter through the Shep Jones Lane lots. Because notices like these can change, the official home page is the best source immediately before a visit.
The trails
The preserve describes roughly five miles of trails through five distinct habitats. The Explore Trails page breaks them down as follows.
- Mill Pond Trail, 0.2 miles. A historic mill pond, a freshwater pond with turtles and waterfowl, a frog pond and an old-field meadow with a labyrinth, reached by boardwalk and stone steps from Harbor Road.
- Coastal Corridor, 0.8 miles. Wooded hills with large glacial boulders and views of Long Island Sound and Stony Brook Harbor, including a pedestrian underpass beneath Harbor Road.
- Hilltop Meadow, 0.9 miles. Five large fields of wildflowers and native grasses seeded in 2001, ringed by hedgerows and woodland. The page gives peak bloom as July, so an October visit shows the meadows in a quieter state.
- Harbor Meadow. Former grazing ground being restored to native grass and wildflower meadow, with views over Stony Brook Harbor and Smithtown Bay and paths to the water’s edge. ADA parking is listed for this area.
- Forest Sanctuary, 1.8 miles. Mostly oak, hickory and beech forest, with spicebush and viburnum along the trails.
A downloadable trail map and an interactive map are linked from the same page. The Forest Sanctuary, with its deciduous canopy, is the section most closely tied to autumn color.
Rules and practical details
The General Info page asks visitors to stay on marked trails and move gently through the habitat. There are no trash cans, so everything carried in must be carried out, and no restrooms or bathroom facilities are available. Dogs are welcome but must be leashed at all times, with owners cleaning up after them.
The home page also notes that Avalon offers a mobile app, available only through the Apple App Store.
How the preserve came to be
The Our Roots page explains that the Paul Simons Foundation maintains the preserve in memory of Paul, described as an avid outdoorsman, and that the project began as a simple notion to create a natural place he would have loved. A timeline on that page records the main steps.
- 1997: the foundation acquired 8 acres on Mill Pond from the Ward Melville Heritage Organization and 76 acres from the Coleman family.
- 1999: construction began, and in 2001 the park opened to the public.
- 2006: the Avalon barn was built and the astronomy program launched.
- 2014 and 2017: the Sky Lab and the Sky Dome were constructed.
- 2017 and 2018: Shore Farm, East Farm Preserve and Perry Farm were acquired; the preserve now totals 216 acres.
The same timeline lists a Strategic Master Plan begun in 2018, with implementation starting in 2020.
Meadows, restoration and wildlife
The Conservation page describes two meadow habitats. Hilltop Meadow is the original meadow, once used as livestock pasture, and Harbor Meadow is newly restored. Both were planted with native, pollinator-friendly species such as milkweed, sunflower, butterfly weed and big bluestem, and they attract bees, butterflies and wasps while offering cover to migrating birds and ground-dwelling mammals.
The preserve also runs a quail and pheasant restoration effort. According to the page, Avalon has worked for seven years to re-establish breeding populations of these ground-nesting birds, raising chicks in a surrogator each year and releasing them into the meadows. Visitors should treat the meadows as nesting and feeding habitat and stay on the marked paths.
Nature programs and the observatories
Programming is a large part of the preserve’s identity. The home page links youth programs for children of all ages, a monthly astronomy series and nature walks, and it points to an events calendar for current listings.
The Sky Dome and Sky Lab are observatory structures led by amateur astronomers. According to the observatories page, they hold several permanently mounted telescopes and are used for both night-sky and solar observing, including sunspots and solar flares. The page lists no fixed schedule and suggests following Avalon on Facebook or Instagram, or joining the mailing list, for event announcements.
Birders have a recurring option. The Four Harbors Audubon Society walks take place on the second Saturday of each month, starting at 8 AM, from the front of the Grist Mill on Harbor Road. Each walk lasts about two hours, covers native and migratory birds across the preserve’s trail system, the Stony Brook Harbor estuary and the harbor front, and welcomes all experience levels. Severe weather can cancel a walk.
The program list does not include an art series that could be confirmed on the official pages, and the General Info and Conservation pages do not mention sculptures or art installations. Readers interested in arts programming in the area can find more in the guide to the Stony Brook neighborhood.
Birdsfoot Farm
A working farm belongs to the Avalon family of programs. The Birdsfoot Farm page says the land has been farmed since the early 1900s, that Suffolk County acquired its development rights in the early 1980s under the Farmland Preservation Act, and that the farm was bought in 2018 when much of the farmland was fallow or overgrown. Regenerative practices include rotational grazing, no-till planting, cover cropping and composting, and projects include American chestnut restoration and a flock of ten Southdown Babydoll sheep. A cider orchard was planted in spring 2025, with fruit expected in about five years. The page notes that honey is sold only at the farmstand but does not publish hours, so those details need confirming directly with the farm.
Planning a seasonal visit
Late October falls under the fall hours, while November brings the earlier 5 PM closing. Since the Forest Sanctuary covers 1.8 miles of woodland, it suits the cooler months when the understory is open. The Mill Pond area, a short and easily walked loop in normal conditions, was among the areas affected by the notices described above.
Nearby sections of the village are covered in the existing Stony Brook neighborhood guide. This article is general information only.
Useful gear
- Celestron Outland X 8×42 Binoculars: a related item for this activity. See it on Amazon (affiliate link)
As an Amazon Associate I earn from qualifying purchases. A commission may be earned if you buy through this link, at no extra cost to you.
Hours, programs and prices change; confirm details with the official sources linked above before visiting.
