Painted Rocks State Park is a public recreation area located at the southern end Painted Rocks Reservoir, 24 miles (39 km) south of Darby, Montana.

The state park received its name from the green, yellow and orange lichens which cover the grey and black rock walls of the granite and rhyolite cliffs.

[5] The reservoir is in the West Fork Valley of the Bitterroot Mountains, which was an important place for the Salish people.

Residential birds include osprey, great blue heron, spotted sandpiper and bald eagles.

[2] The park offers outdoor activities such as bird watching, boating, camping, fishing, canoeing, hiking, photography, picnicking, swimming, and wildlife viewing.