開催日 ラウンド サーキット
2018/03/11 Rd.1 St. Petersburg
2018/04/08 Rd.2 ISM Raceway(4/7)
2018/04/15 Rd.3 Long Beach
2018/04/22 Rd.4 Barber Motorsports Park
2018/05/13 Rd.5 Indianapolis Motor Speedway(5/12)
2018/05/27 Rd.6 Indianapolis Motor Speedway - INDY500
2018/06/03 Rd.7-8 The Raceway at Belle Isle Park(6/2-3)
2018/06/10 Rd.9 Texas Motor Speedway(6/9)
2018/06/24 Rd.10 Road America
2018/07/08 Rd.11 Iowa Speedway
2018/07/15 Rd.12 Toronto
2018/07/29 Rd.13 Mid-Ohio Sports Car Course
2018/08/19 Rd.14 Pocono Raceway
2018/08/26 Rd.15 Gateway Motorsports Park(8/25)
2018/09/02 Rd.16 Portland International Raceway
2018/09/16 Rd.17 Sonoma Raceway