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.
| Rnd | Race | Length | Circuit | Location | Date | |
|---|---|---|---|---|---|---|
| 1 | Lime Rock International Open | 140miles | Lime Rock Park | Lakeville, Connecticut | September 7 | |
| 2 | Marlboro Grand Prix | 76miles | Marlboro Motor Raceway | Upper Marlboro, Maryland | September 21 | |
| 3 | International Formula Libre Grand Prix | 300km (200miles) | Watkins Glen International | Watkins Glen, New York | September 28 | |
| 4 | United States Grand Prix for Sports Cars | 200miles | Riverside International Raceway | Riverside, California | October 12 |
| Rnd | Circuit | Winning Team | Results |
|---|---|---|---|
| Winning Driver | |||
| 1 | Lime Rock |
| Results |
 George Constantine | |||
| 2 | Marlboro |
| Results |
| George Constantine | |||
| 3 | Watkins Glen |
| Results |
 Jo Bonnier | |||
| 4 | Riverside | Results | |
| Chuck Daigh |