2013 Trans-Am Series
The 2013 Trans-Am Series was the 45th running of the Sports Car Club of America's Trans-Am Series.
Rule changes
The GGT class of the previous year was replaced by the TA3 class. The TA3 class was later broken into two groups TA3-International, based on SCCA GT2 rules, and TA3-American Muscle, based on NASA American Iron Racing class rules, with year and model restrictions.Calendar and results
| Round | Circuit | Date | TA Winning driver | TA Winning vehicle | TA2 Winning driver | TA2 Winning vehicle | TA3 Winning driver | TA3 Winning vehicle |
| 1 | Sebring International Raceway | March 3 |  Doug Peterson | Chevrolet Corvette | Cameron Lawrence | Chevrolet Camaro | C. David Seuss | Porsche 996 |
| 2 | Canadian Tire Motorsport Park | May 19 | Doug Peterson | Chevrolet Corvette | Tony Buffomante | Chevrolet Camaro | Chuck Cassaro | Ford Mustang |
| 3 | Lime Rock Park | May 25 | Paul Fix | Chevrolet Corvette | Bob Stretch | Chevrolet Camaro | C. David Seuss | Porsche 996 |
| 4 | Watkins Glen International | June 9 | Doug Peterson | Chevrolet Corvette | Cameron Lawrence | Chevrolet Camaro | C. David Seuss | Porsche 996 |
| 5 | Road America | June 21 | Doug Peterson | Chevrolet Corvette | Cameron Lawrence | Chevrolet Camaro | Chuck Cassaro | Ford Mustang |
| 6 | Mid-Ohio Sports Car Course | August 17 | Cliff Ebben | Ford Mustang | Cameron Lawrence | Chevrolet Camaro | Todd Napieralski | Chevrolet Camaro |
| 7 | Brainerd International Raceway | September 1 | Doug Peterson | Chevrolet Corvette | Cameron Lawrence | Chevrolet Camaro | C. David Seuss | Porsche 996 |
| 8 | Virginia International Raceway | September 29 | Simon Gregg | Chevrolet Corvette | Cameron Lawrence | Chevrolet Camaro | Steve Kent, Jr. | Ford Mustang |
| 9 | Road Atlanta | November 3 | Tony Ave | Chevrolet Corvette | Cameron Lawrence | Chevrolet Camaro | Todd Napieralski | Chevrolet Camaro |
| 10 | Daytona International Speedway | November 17 | Doug Peterson | Chevrolet Corvette | Cameron Lawrence | Chevrolet Camaro | Steve Kent, Jr. | Ford Mustang |