2021 | Entry Lists
| Circuit Names / Country | Date | List |
|---|---|---|
| Sonoma Raceway / United States of America | 5 - 7 March 2021 | View List |
| Circuit of the Americas / United States of America | 30 April 2021 - 2 May 2021 | Not available |
| VIRginia International Raceway / United States of America | 4 - 6 June 2021 | Not available |
| Road America / United States of America | 27 - 29 August 2021 | Not available |
| Watkins Glen / United States of America | 17 - 19 September 2021 | Not available |
| Indianapolis Motor Speedway / United States of America | 15 - 17 October 2021 | Not available |