開催日 ラウンド サーキット
2021/4/18 Rd.1 Barber Motorsports Park
2021/4/25 Rd.2 Streets of St. Petersburg
2021/5/1 Rd.3 Texas Motor Speedway Race 1
2021/5/2 Rd.4 Texas Motor Speedway Race 2
2021/5/15 Rd.5 Indianapolis Motor Speedway (Road Course)
2021/5/30 Rd.6 The 105th Indianapolis 500
2021/6/12 Rd.7 Raceway at Belle Isle Park Race 1
2021/6/13 Rd.8 Raceway at Belle Isle Park Race 2
2021/6/20 Rd.9 Road America
2021/7/4 Rd.10 Mid-Ohio Sports Car Course
2021/7/11 Rd.11 Streets of Toronto
2021/8/8 Rd.12 Streets of Nashville
2021/8/14 Rd.13 Indianapolis Motor Speedway (Road Course)
2021/8/21 Rd.14 World Wide Technology Raceway
2021/9/12 Rd.15 Portland International Raceway
2021/9/19 Rd.16 WeatherTech Raceway Laguna Seca
2021/9/26 Rd.17 Streets of Long Beach