BILLINGS — Pictograph Cave State Park southeast of Billings will change to its autumn schedule starting Tuesday. The state park will be open every day from 9 a.m. to 7 p.m. and the new visitor center will open from 10 a.m. to 6 p.m. daily through Oct. 31.
Two of the three rock overhangs at Pictograph Cave State Park provided shelter for prehistoric Indians as long as 10,000 years ago. The earliest artists decorated the walls of Pictograph Cave with enduring black and white pigments. Later artists added images of red rifles, horses and plains animals. The oldest rock art in the cave is more than 2,500 years old. The most recent additions are estimated at 200 to 500 years old.