Dallara IR18
| Week | Date | Track | Cars |
|---|---|---|---|
| 1 | Feb 26 | Sebring International Raceway - International | Dallara IR18 |
| 2 | Mar 5 | Phoenix Raceway - Oval | Dallara IR18 |
| 3 | Mar 19 | St. Petersburg Grand Prix - Grand Prix | Dallara IR18 |
| 4 | Mar 26 | Barber Motorsports Park | Dallara IR18 |
| 5 | Apr 16 | Long Beach Street Circuit | Dallara IR18 |
| 6 | May 7 | Indianapolis Motor Speedway - Road Course | Dallara IR18 |
| 7 | May 21 | Indianapolis Motor Speedway - Open Wheel Oval | Dallara IR18 |
| 8 | May 28 | Detroit Grand Prix at Belle Isle - Belle Isle | Dallara IR18 |
| 9 | Jun 4 | World Wide Technology Raceway (Gateway) - Oval | Dallara IR18 |
| 10 | Jun 18 | Road America - Full Course | Dallara IR18 |
| 11 | Jul 2 | Mid-Ohio Sports Car Course - Full Course | Dallara IR18 |
| 12 | Jul 16 | Nashville Superspeedway | Dallara IR18 |
| 13 | Aug 6 | Portland International Raceway - Full Circuit | Dallara IR18 |
| 14 | Aug 13 | Circuit Gilles Villeneuve | Dallara IR18 |
| 15 | Aug 20 | Chicago Street Course - 2023 Cup | Dallara IR18 |
| 16 | Aug 27 | The Milwaukee Mile | Dallara IR18 |
| 17 | Sep 3 | WeatherTech Raceway at Laguna Seca - 2026 | Dallara IR18 |