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 |