black and white Downy Woodpecker stands on a tree branch
Welcome to

Mildred Caldwell APP Sanctuary of Walden Woods

Downy Woodpecker. Photo: Katrina Baker/APP Photography Awards
Discover adventure, birds, and how to make a difference at an APP center.

Greenwich, CT

Open Today Sunrise - Sunset

A Natural Oasis Where Birds Thrive

This is one of seven sanctuaries managed by the APP in Greenwich. Mildred Bedard Caldwell left this 22-acre woodland sanctuary to the local Greenwich APP Center chapter. The main trail crosses Strickland Brook by a boardwalk before leading into deciduous woodland that was farmland until about 1900. Remnants of farming activity include the stone enclosure known as Pugh’s Pig Pen. Two large stone boulders on the upland trail are “erratics” deposited by the glaciers that covered the area 12,000 years ago. A trail leads directly into the 62-acre Montgomery Pinetum owned by the Town of Greenwich.

Hours: Open Daily, Sunrise to Sunset

Location: The entrance is on Bible Street, 100 yards south of the intersection of Bible Street and Cat Rock Road. Parking is by the side of the road on Bible Street.

Trail Map
Download our trail map as a PDF.
Trail Rules
Learn more about our visitor guidelines.
Four people in winter clothing and wearing binoculars walk toward the camera.
Greenwich APP Center Great Backyard Bird Count. Photo: Luke Franke/APP

Greenwich APP Center

Mildred Caldwell APP Sanctuary of Walden Woods is a sister sanctuary to Greenwich APP Center.
Read about it
Centers and Sanctuaries in Connecticut
Two small gray Chipping Sparrows sit on a bare branch
Chipping Sparrows. Photo: Kathy Malone/APP Photography Awards
Emily Winthrop Miles Wildlife APP Sanctuary
Sharon, CT
A photo of dark red buildings surrounded by green trees and shrubs.
APP Bent of the River. Photo: Luke Franke/APP
Bent of the River APP Center
Southbury, CT
Hiking trails
Bathrooms
Pollinator garden
Overhead view of Sharon APP Center with red buildings and tree canopy
Sharon APP Center MOTUS station. Photo: Luke Franke/APP
Sharon APP Center
Sharon, CT
Bathrooms
Hiking trails
Nature store
Aviary
Pollinator garden
Four people in winter clothing and wearing binoculars walk toward the camera.
Greenwich APP Center Great Backyard Bird Count. Photo: Luke Franke/APP
Greenwich APP Center
Greenwich, CT
Bathrooms
Hiking trails
Nature store
Pollinator garden
Parking lot
yellow and black Prairie Warbler sings
Prairie Warbler. Photo: Jesse Gordon/APP Photography Awards
Gimbel Sanctuary
Greenwich, CT
a yellow Common Yellowthroat flies next to some large purple coneflowers
Common Yellowthroat. Photo: Scott Keys/APP Photography Awards
Fairchild Wildflower APP Sanctuary
Greenwich, CT
a Black-throated Green Warbler, a yellow, black, and white bird, stands on eastern hemlock
Black-throated Green Warbler on eastern hemlock. Photo: Scott Keys/APP Photography Awards
Hemlock Gorge APP Sanctuary
Greenwich, CT
Hiking trails
Snowy Egret crouches near some water
Snowy Egret. Photo: Steve Torna/APP Photography Awards
Oneida APP Sanctuary
Greenwich, CT
APP Connecticut
Learn more about how APP Connecticut makes a difference for birds.
Visit Us
Visit Us