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 |  Paul Gentilozzi | Chevrolet Corvette | |
| 2 | Homestead | Paul Gentiliozzi | Chevrolet Corvette | |
| 3 | Lime Rock Park | Lou Gigliotti | Ford Mustang | |
| 4 | Detroit | Paul Gentilozzi | Chevrolet Corvette | |
| 5 | Mid-Ohio | Paul Gentilozzi | Chevrolet Corvette | |
| 6 | Minneapolis | Paul Gentilozzi | Chevrolet Corvette | |
| 7 | Cleveland | Bill Saunders | Chevrolet Corvette | |
| 8 | Grand Rapids | Bill Saunders | Chevrolet Corvette | |
| 9 | Trois-Rivières | Paul Gentilozzi | Chevrolet Corvette | |
| 10 | Watkins Glen | Paul Gentilozzi | Chevrolet Corvette | |
| 11 | Road America | Stu Hayner | Chevrolet Camaro | |
| 12 | Pikes Peak | Brian Simo | Ford Mustang | |
| 13 | Houston | Brian Simo | Ford Mustang |