"Maine’s Acadia National Park is, far and away, one of the best national parks for leaf peeping. The park notes that peak foliage typically occurs in mid-October, but you can check the status of the fall colors on the Maine Foliage website (which is updated weekly in the autumn). For the best views of the changing leaves, make your way to Cadillac Mountain, hike the Beehive Loop Trail, or embark on a boat tour of Frenchman Bay." - Travel + Leisure Editors