Portland International Raceway
1.964 Mile Road Course
Portland, Oregon
NASA sanctioned 2006
INDYCAR sanctioned 2018-20
USAC sanctioned 2022-24
| Race # | Date | Miles | Winner |
| 1 | 6/17/2006 | 43.208 | J. R. Hildebrand |
| 2 | 6/18/2006 | 29.46 | J. R. Hildebrand |
| 3 | 9/1/2018 | 49.1 | Kyle Kirkwood |
| 4 | 9/2/2018 | 49.1 | Kyle Kirkwood |
| 5 | 8/31/2019 | 49.1 | Hunter McElrea |
| 6 | 9/1/2019 | 49.1 | Hunter McElrea |
| ** | 9/12/2020 | ** | ** |
| ** | 9/13/2020 | ** | ** |
| 7 | 9/2/2022 | 49.1 | Jace Denmark |
| 8 | 9/2/2022 | 35.352 | Mac Clark |
| 9 | 9/3/2022 | 49.1 | Michael d'Orlando |
| 10 | 9/1/2023 | 49.1 | Jacob Douglas |
| 11 | 9/2/2023 | 49.1 | Jacob Douglas |
| 12 | 9/3/2023 | 49.1 | Simon Sikes |
| 13 | 8/23/2024 | 47.136 | Michael Costello |
| 14 | 8/24/2024 | 49.1 | Max Garcia |
| 15 | 8/24/2024 | 49.1 | G3 Argyros |
**Race cancelled due to safety concerns over coronavirus