The 1980 Trans-Am Series was the fifteenth running of the Sports Car Club of America's premier series. After several years of recovery from the decline of demand for muscle cars in the early seventies and the 1973 Oil Crisis, Trans Am evolved into a support series for the IMSA GT Championship, using vehicles that were also used in IMSA GT races. This would set the standard for the series thereafter, and this standard would be applied to the SCCA's World Challenge series many years later. Almost all of the races ran for approximately one hundred miles. Besides Watkins Glen, the only exception was Trois-Rivières (~75 miles).[1]
| Rd | Date | Circuit | Distance | Info | |
|---|---|---|---|---|---|
| 1 | June 1 |  Hallett Motor Racing Circuit | 100 miles (55 laps) | ||
| 2 | June 15 | Portland International Raceway | 100 miles (50 laps) | ||
| 3 | July 5 | Watkins Glen International | 6 hours (139 laps) | Also a round of the 1980 World Championship for Makes. | |
| 4 | July 19 | Road America | 100 miles (25 laps) | ||
| 5 | August 10 | Brainerd International Raceway | 100 miles (33 laps) | ||
| 6 | August 23 |  Circuit Trois-Rivières | 75 miles (35 laps) | ||
| 7 | September 7 | Westwood Motorsport Park | 100 miles (56 laps) | ||
| 8 | October 19 | Laguna Seca Raceway | 100 miles (52 laps) | ||
| 9 | October 25 | Riverside International Raceway | 100 miles (40 laps) |
| Round | Circuit | Winning driver | Winning vehicle | |
|---|---|---|---|---|
| 1 | Hallett | John Bauer | Porsche 911 | |
| 2 | Portland | Mark Pielsticker | Chevrolet Monza | |
| 3 | Watkins Glen | John Bauer Larry Green | Porsche 911 | |
| 4 | Road America | Monte Sheldon | Porsche 911 | |
| 5 | Brainerd | John Bauer | Porsche 911 | |
| 6 | Trois-Rivières | Roy Woods | Chevrolet Camaro | |
| 7 | Westwood | John Bauer | Porsche 911 | |
| 8 | Laguna Seca | Greg Pickett | Chevrolet Corvette | |
| 9 | Riverside | Greg Pickett | Chevrolet Corvette |