The 1998 Trans-Am Series was the 33rd season of the Sports Car Club of America's Trans-Am Series.
| Round | Circuit | Winning driver | Winning vehicle |
|---|---|---|---|
| 1 | Long Beach | | Chevrolet Corvette |
| 2 | Homestead | | Chevrolet Corvette |
| 3 | Lime Rock Park | | Ford Mustang |
| 4 | Detroit | | Chevrolet Corvette |
| 5 | Mid-Ohio | | Chevrolet Corvette |
| 6 | Minneapolis | | Chevrolet Corvette |
| 7 | Cleveland | | Chevrolet Corvette |
| 8 | Grand Rapids | | Chevrolet Corvette |
| 9 | Trois-Rivières | | Chevrolet Corvette |
| 10 | Watkins Glen | | Chevrolet Corvette |
| 11 | Road America | | Chevrolet Camaro |
| 12 | Pikes Peak | | Ford Mustang |
| 13 | Houston | | Ford Mustang |