Tyler Arboretum is a non-profit public garden in Delaware County, PA, serving the Greater Philadelphia region. One of the oldest arboreta in the northeastern United States, Tyler Arboretum encompasses 650 acres of renowned plant collections, heritage and champion trees, historic buildings, and 17 miles of hiking trails through woodlands, wetlands, and meadows. The Arboretum is open to the public 362 days a year.