1978 IMSA GT Championship season Schedule Schedule

| Race | Length_ | Class_ | Circuit | Date_ |
|---|---|---|---|---|
| Hallett Grand Prix | mi (km) | GTX/GTO | Hallett Motor Racing Circuit | May 7 |
| Coca-Cola 300 | mi (km) | GTX/GTO | Lime Rock Park | May 29 |
| Coca-Cola 300 | mi (km) | GTU | Lime Rock Park | May 29 |
| Pepsi Grand Prix | mi (km) | All | Brainerd International Raceway | June 18 |
| Paul Revere 250 | mi (km) | All | Daytona International Speedway | July 4 |
| Sears Point Grand Prix | mi (km) | GTX/GTO | Sears Point International Raceway | July 30 |
| Sears Point Grand Prix | mi (km) | GTU | Sears Point International Raceway | July 30 |
| G.I. Joe`s Grand Prix | mi (km) | GTX/GTO | Portland International Raceway | August 6 |
| G.I. Joe`s Grand Prix | 45 Minutes | GTU | Portland International Raceway | August 6 |