Deer Mountain Campground is a remote New Hampshire state park in Pittsburg along U.S. Route 3, within the 1,648-acre Connecticut Lakes State Forest beside the Connecticut River between Second and Third Connecticut Lakes. Near the Canadian border, it serves as a simple primitive campground with 25 campsites for camping, picnicking, canoeing, and fishing. Its location in the Connecticut Lakes region also makes it a noted place for moose watching. The campground drew wider attention as one of 10 New Hampshire state parks in the path of totality for the 2024 solar eclipse, experiencing 3 minutes and 22 seconds of totality.