Dallara IL-15
| Week | Date | Track | Cars |
|---|---|---|---|
| 1 | Jun 16 | Road America - Full Course | Dallara IL-15 |
| 2 | Jun 23 | Silverstone Circuit - Grand Prix | Dallara IL-15 |
| 3 | Jun 30 | Mid-Ohio Sports Car Course - Full Course | Dallara IL-15 |
| 4 | Jul 7 | Charlotte Motor Speedway - Roval 2025 | Dallara IL-15 |
| 5 | Jul 14 | Motorsport Arena Oschersleben - Grand Prix | Dallara IL-15 |
| 6 | Jul 21 | Mobility Resort Motegi - Grand Prix | Dallara IL-15 |
| 7 | Jul 28 | Tsukuba Circuit - 2000 Full | Dallara IL-15 |
| 8 | Aug 4 | Portland International Raceway - Full Circuit | Dallara IL-15 |
| 9 | Aug 11 | Circuit Gilles Villeneuve | Dallara IL-15 |
| 10 | Aug 18 | Chicago Street Course - 2023 Cup | Dallara IL-15 |
| 11 | Aug 25 | Daytona International Speedway - Road Course | Dallara IL-15 |
| 12 | Sep 1 | WeatherTech Raceway at Laguna Seca - 2026 | Dallara IL-15 |