The Hartford club remained in the League for 1877 but played its home games at Union Grounds in Brooklyn, New York, whose last professional tenant had gone out of business.

Contemporary maps show that the ballpark was bounded by Wyllys Street to the northwest and Hendricxsen Avenue to the northeast, with trees and residences along the south sides of the field.

The stands were situated along Wyllys, and the diamond was set up with home plate pointing northwest.

The Hartford Base Ball Grounds was marked with a memorial bronze plaque in July 2008.

[1] In June 2013, the bases were marked with commemorative granite slabs on their approximate original locations on the grounds field just in front of the Church of the Good Shepherd's Caldwell Colt Memorial.