| 1 | Sebring | 3/18/05 | Sebring International Raceway | 1 | 1 |
| 2 | Road Atlanta-1 | 4/16/05 | Road Atlanta | 5 | 1 |
| 3 | Mid-Ohio | 5/21/05 | Mid-Ohio Sports Car Course | 1 | 1 |
| 4 | Montreal | 6/11/05 | Circuit Gilles-Villeneuve | 1 | 1 |
| 5 | Pikes Peak | 7/3/05 | Pikes Peak International Raceway | 9 | 12 |
| 6 | Infineon Raceway-1 | 7/16/05 | Sonoma Raceway | 2 | 4 |
| 7 | Infineon Raceway-2 | 7/17/05 | Sonoma Raceway | 2 | 2 |
| 8 | Portland | 7/30/05 | Portland International Raceway | 3 | 5 |
| 9 | Road America | 8/20/05 | Road America | 1 | 3 |
| 10 | Mosport | 9/2/05 | Canadian Tire Motorsport Park | 3 | 3 |
| 11 | Road Atlanta-2 | 9/30/05 | Road Atlanta | 4 | 3 |
| 12 | Mazda Raceway Laguna Seca | 10/15/05 | Laguna Seca Raceway | 5 | 7 |