Petoskey was the head football coach for the Hillsdale College in Hillsdale, Michigan. He held that position for the 1949 and 1950 seasons. His coaching record at Hillsdale was 11–7–1.[3] Before going to Hillsdale he was head football coach at St. Joseph High School in St. Joseph, Michigan from 1947 to 1948, where his record was 7–5–3. He was an assistant at Western Michigan before being named head coach.