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 | 140 mi (230 km) | Lime Rock Park | Lakeville, Connecticut | September 7 |
| 2 | Marlboro Grand Prix | 76 mi (122 km) | Marlboro Motor Raceway | Upper Marlboro, Maryland | September 21 |
| 3 | International Formula Libre Grand Prix | 300 km (190 mi) | Watkins Glen International | Watkins Glen, New York | September 28 |
| 4 | United States Grand Prix for Sports Cars | 200 mi (320 km) | Riverside International Raceway | Riverside, California | October 12 |
| Rnd | Circuit | Winning team | Results |
|---|---|---|---|
| Winning driver | |||
| 1 | Lime Rock | #49 Elisha Walker | Results |
 George Constantine | |||
| 2 | Marlboro | #49 Elisha Walker | Results |
| George Constantine | |||
| 3 | Watkins Glen | #11 Jo Bonnier | Results |
 Jo Bonnier | |||
| 4 | Riverside | #5 Reventhrow Automobile Incorporated | Results |
| Chuck Daigh |