The 1958 USAC Road Racing Championship season was the inaugural season of the USAC Road Racing Championship. The series was contested for sports cars at three rounds (Lime Rock, Marlboro, and Riverside), and Formula Libre at one round (Watkins Glen). It began September 7, 1958, and ended October 12, 1958, after four races. Dan Gurney won the season championship.
References
1958 USAC Road Racing Championship Wikipedia(Text) CC BY-SA