Schedule
The GT and Prototype classes did not participate in all events, nor did they race together at shorter events. The AAC class only participated in GT-only events. Races marked with All had all classes on track at the same time.
| Rnd | Race | Length | Class | Circuit | Date |
|---|---|---|---|---|---|
| 1 | SunBank 24 at Daytona | 24 Hours | All | Daytona International Speedway | February 3 February 4 |
| 2 | Nissan Grand Prix of Miami | 2 Hours 45 Minutes | Proto | Streets of Miami | February 25 |
| 45 Minutes | GT | ||||
| 3 | 12 Hours of Sebring | 12 Hours | All | Sebring International Raceway | March 17 |
| 4 | Nissan Grand Prix of Atlanta | 500 km | Proto | Road Atlanta | April 1 |
| 5 | Toyota Grand Prix of Long Beach | 1 Hour | GT | Long Beach street course | April 21 |
| 6 | Toyota Grand Prix of Palm Beach | 3 Hours | Proto | West Palm Beach street course | April 22 |
| 7 | Camel Grand Prix of the Heartland | 2 Hours | GT | Heartland Park | May 5 |
| 300 km | Proto | May 6 | |||
| 8 | Toyota Trucks Lime Rock Grand Prix | 150 Laps | Proto | Lime Rock Park | May 28 |
| 9 | Nissan Grand Prix of Ohio | 500 km | Proto | Mid-Ohio Sports Car Course | June 3 |
| 300 km | GT | ||||
| 10 | Nissan Grand Prix of Mosport | 300 km | GT | Mosport Park | June 24 |
| 11 | Camel Continental | 500 km | Proto | Watkins Glen International | July 1 |
| 12 | Grand Prix of the Meadowlands | 45 Minutes | GT | Meadowlands Sports Complex | July 14 |
| 13 | California Camel Grand Prix | 300 km | Proto | Sears Point Raceway | July 15 |
| 14 | G.I. Joe's Camel Grand Prix | 300 km | Proto | Portland International Raceway | July 29 |
| 1 Hour 30 Minutes | GT | ||||
| 15 | Nissan Grand Prix of Road America | 300 km | GT | Road America | August 19 |
| 500 km | Proto | ||||
| 16 | Nissan Camel Grand Prix of San Antonio | 2 Hours | Proto | San Antonio street course | September 2 |
| 45 Minutes | GT | ||||
| 17 | The New York 500 | 500 km | GT | Watkins Glen International | September 23 |
| 18 | The Jamesway 300 | 2 Hours | GT | Lime Rock Park | September 29 |
| 19 | Nissan World Challenge of Tampa | 200 Miles | Proto | Florida State Fairgrounds | September 30 |
| 20 | Camel Grand Prix of Greater San Diego | 1 Hour | GT | Del Mar Fairgrounds | November 10 |
| 1 Hour 45 Minutes | Proto | November 11 |
Read more about this topic: 1990 IMSA GT Championship Season