Gridley Mountain, 2,211 feet (674 m), is the third highest elevation in the state of Connecticut.

[2] The mountain, part of the Taconic Range, has no official trail and is located on private property.

The Mount Washington Road passes the mountain from the west.

Gridley Mountain is located in Salisbury, Connecticut.

The west side of the mountain drains into Riga Lake and South Pond, then into Wachocostinook Brook, Salmon Creek, the Housatonic River, and Long Island Sound.