iRacing IMSA Calendar
6 matching series across 54 scheduled series-weeks, including 1 fixed-setup series. Browse every published week, track and race cadence.
2026 Season 4 · 6 seriess · 28 track configurations · 30 cars · 1 fixed-setup series
Categories: SPORTS CAR. Published week starts run from to . The most-scheduled configuration is Indianapolis Motor Speedway - Road Course, used for 4 series-weeks.
Series in this calendar
- IMSA Endurance Series - 2026 Season 4
- IMSA iRacing Series - Fixed by GO Fast - 2026 Season 4
- IMSA iRacing Series by GO Fast - 2026 Season 4
- IMSA Michelin Pilot Challenge - 2026 Season 4
- IMSA Sportscar Endurance Challenge - 2026 Season 4
- IMSA Vintage Series - 2026 Season 4
2026 Season 4 schedule
| Week | Week starts | Series | Track | Race cadence | Length |
|---|---|---|---|---|---|
| 1 | IMSA iRacing Series - Fixed by GO Fast - 2026 Season 4 | Indianapolis Motor Speedway - Road Course | Races every 2 hours at :45 past | Rolling 35 mins | |
| 1 | IMSA iRacing Series by GO Fast - 2026 Season 4 | Indianapolis Motor Speedway - Road Course | Races every 2 hours at :45 past | Rolling 45 mins | |
| 1 | IMSA Vintage Series - 2026 Season 4 | Canadian Tire Motorsports Park | Races every 2 hours on the hour | Rolling 40 mins | |
| 1 | IMSA Endurance Series - 2026 Season 4 | Road Atlanta - Full Course | Races every other Saturday at 2, 7, 18 GMT and Sunday at 14 GMT | Rolling 160 mins | |
| 1 | IMSA Sportscar Endurance Challenge - 2026 Season 4 | Silverstone Circuit - Grand Prix | Races every other Saturday at 4 & 15 GMT and Sunday at 0 GMT, 20 GMT | Rolling 120 mins | |
| 2 | IMSA iRacing Series - Fixed by GO Fast - 2026 Season 4 | Road Atlanta - Full Course | Races every 2 hours at :45 past | Rolling 35 mins | |
| 2 | IMSA iRacing Series by GO Fast - 2026 Season 4 | Road Atlanta - Full Course | Races every 2 hours at :45 past | Rolling 45 mins | |
| 2 | IMSA Vintage Series - 2026 Season 4 | Summit Point Raceway - Summit Point Raceway | Races every 2 hours on the hour | Rolling 40 mins | |
| 1 | IMSA Michelin Pilot Challenge - 2026 Season 4 | Indianapolis Motor Speedway - Road Course | Races every other Saturday at 4 & 15 GMT and Sunday at 0 GMT, 20 GMT | Rolling 120 mins | |
| 3 | IMSA iRacing Series - Fixed by GO Fast - 2026 Season 4 | Fuji International Speedway - Grand Prix | Races every 2 hours at :45 past | Rolling 35 mins | |
| 3 | IMSA iRacing Series by GO Fast - 2026 Season 4 | Fuji International Speedway - Grand Prix | Races every 2 hours at :45 past | Rolling 45 mins | |
| 3 | IMSA Vintage Series - 2026 Season 4 | Qualcomm Circuit (Naval Base Coronado) | Races every 2 hours on the hour | Rolling 40 mins | |
| 2 | IMSA Endurance Series - 2026 Season 4 | Fuji International Speedway - Grand Prix | Races every other Saturday at 2, 7, 18 GMT and Sunday at 14 GMT | Rolling 160 mins | |
| 2 | IMSA Sportscar Endurance Challenge - 2026 Season 4 | Brands Hatch Circuit - Grand Prix | Races every other Saturday at 4 & 15 GMT and Sunday at 0 GMT, 20 GMT | Rolling 120 mins | |
| 4 | IMSA iRacing Series - Fixed by GO Fast - 2026 Season 4 | Red Bull Ring - Grand Prix | Races every 2 hours at :45 past | Rolling 35 mins | |
| 4 | IMSA iRacing Series by GO Fast - 2026 Season 4 | Red Bull Ring - Grand Prix | Races every 2 hours at :45 past | Rolling 45 mins | |
| 4 | IMSA Vintage Series - 2026 Season 4 | Indianapolis Motor Speedway - Road Course | Races every 2 hours on the hour | Rolling 60 mins | |
| 2 | IMSA Michelin Pilot Challenge - 2026 Season 4 | Road Atlanta - Full Course | Races every other Saturday at 4 & 15 GMT and Sunday at 0 GMT, 20 GMT | Rolling 120 mins | |
| 5 | IMSA iRacing Series - Fixed by GO Fast - 2026 Season 4 | Long Beach Street Circuit | Races every 2 hours at :45 past | Rolling 35 mins | |
| 5 | IMSA iRacing Series by GO Fast - 2026 Season 4 | Long Beach Street Circuit | Races every 2 hours at :45 past | Rolling 45 mins | |
| 5 | IMSA Vintage Series - 2026 Season 4 | Snetterton Circuit - 200 | Races every 2 hours on the hour | Rolling 40 mins | |
| 3 | IMSA Endurance Series - 2026 Season 4 | Long Beach Street Circuit | Races every other Saturday at 2, 7, 18 GMT and Sunday at 14 GMT | Rolling 160 mins | |
| 3 | IMSA Sportscar Endurance Challenge - 2026 Season 4 | Summit Point Raceway - Summit Point Raceway | Races every other Saturday at 4 & 15 GMT and Sunday at 0 GMT, 20 GMT | Rolling 120 mins | |
| 6 | IMSA iRacing Series - Fixed by GO Fast - 2026 Season 4 | Circuit Gilles Villeneuve | Races every 2 hours at :45 past | Rolling 35 mins | |
| 6 | IMSA iRacing Series by GO Fast - 2026 Season 4 | Circuit Gilles Villeneuve | Races every 2 hours at :45 past | Rolling 45 mins | |
| 6 | IMSA Vintage Series - 2026 Season 4 | Sebring International Raceway - International | Races every 2 hours on the hour | Rolling 40 mins | |
| 3 | IMSA Michelin Pilot Challenge - 2026 Season 4 | Charlotte Motor Speedway - Roval 2019 | Races every other Saturday at 4 & 15 GMT and Sunday at 0 GMT, 20 GMT | Rolling 120 mins | |
| 7 | IMSA iRacing Series - Fixed by GO Fast - 2026 Season 4 | Circuit des 24 Heures du Mans - 24 Heures du Mans | Races every 2 hours at :45 past | Rolling 35 mins | |
| 7 | IMSA iRacing Series by GO Fast - 2026 Season 4 | Circuit des 24 Heures du Mans - 24 Heures du Mans | Races every 2 hours at :45 past | Rolling 45 mins | |
| 7 | IMSA Vintage Series - 2026 Season 4 | Sandown International Motor Raceway | Races every 2 hours on the hour | Rolling 40 mins | |
| 4 | IMSA Endurance Series - 2026 Season 4 | Circuit des 24 Heures du Mans - 24 Heures du Mans | Races every other Saturday at 2, 7, 18 GMT and Sunday at 14 GMT | Rolling 160 mins | |
| 4 | IMSA Sportscar Endurance Challenge - 2026 Season 4 | Circuit Zolder - Alternate | Races every other Saturday at 4 & 15 GMT and Sunday at 0 GMT, 20 GMT | Rolling 120 mins | |
| 8 | IMSA iRacing Series - Fixed by GO Fast - 2026 Season 4 | Autódromo Hermanos Rodríguez - Grand Prix | Races every 2 hours at :45 past | Rolling 35 mins | |
| 8 | IMSA iRacing Series by GO Fast - 2026 Season 4 | Autódromo Hermanos Rodríguez - Grand Prix | Races every 2 hours at :45 past | Rolling 45 mins | |
| 8 | IMSA Vintage Series - 2026 Season 4 | Daytona International Speedway - Road Course | Races every 2 hours on the hour | Rolling 40 mins | |
| 4 | IMSA Michelin Pilot Challenge - 2026 Season 4 | Circuito de Navarra - Speed Circuit | Races every other Saturday at 4 & 15 GMT and Sunday at 0 GMT, 20 GMT | Rolling 120 mins | |
| 9 | IMSA iRacing Series - Fixed by GO Fast - 2026 Season 4 | Suzuka International Racing Course - Grand Prix | Races every 2 hours at :45 past | Rolling 35 mins | |
| 9 | IMSA iRacing Series by GO Fast - 2026 Season 4 | Suzuka International Racing Course - Grand Prix | Races every 2 hours at :45 past | Rolling 45 mins | |
| 9 | IMSA Vintage Series - 2026 Season 4 | Suzuka International Racing Course - Grand Prix | Races every 2 hours on the hour | Rolling 40 mins | |
| 5 | IMSA Endurance Series - 2026 Season 4 | Suzuka International Racing Course - Grand Prix | Races every other Saturday at 2, 7, 18 GMT and Sunday at 14 GMT | Rolling 160 mins | |
| 5 | IMSA Sportscar Endurance Challenge - 2026 Season 4 | Mobility Resort Motegi - Grand Prix | Races every other Saturday at 4 & 15 GMT and Sunday at 0 GMT, 20 GMT | Rolling 120 mins | |
| 10 | IMSA iRacing Series - Fixed by GO Fast - 2026 Season 4 | Silverstone Circuit - Grand Prix | Races every 2 hours at :45 past | Rolling 35 mins | |
| 10 | IMSA iRacing Series by GO Fast - 2026 Season 4 | Silverstone Circuit - Grand Prix | Races every 2 hours at :45 past | Rolling 45 mins | |
| 10 | IMSA Vintage Series - 2026 Season 4 | Road America - Full Course | Races every 2 hours on the hour | Rolling 60 mins | |
| 5 | IMSA Michelin Pilot Challenge - 2026 Season 4 | Autodromo Nazionale Monza - Grand Prix | Races every other Saturday at 4 & 15 GMT and Sunday at 0 GMT, 20 GMT | Rolling 120 mins | |
| 11 | IMSA iRacing Series - Fixed by GO Fast - 2026 Season 4 | Sebring International Raceway - International | Races every 2 hours at :45 past | Rolling 35 mins | |
| 11 | IMSA iRacing Series by GO Fast - 2026 Season 4 | Sebring International Raceway - International | Races every 2 hours at :45 past | Rolling 45 mins | |
| 11 | IMSA Vintage Series - 2026 Season 4 | Circuit Zolder - Grand Prix | Races every 2 hours on the hour | Rolling 40 mins | |
| 6 | IMSA Endurance Series - 2026 Season 4 | Sebring International Raceway - International | Races every other Saturday at 2, 7, 18 GMT and Sunday at 14 GMT | Rolling 160 mins | |
| 6 | IMSA Sportscar Endurance Challenge - 2026 Season 4 | Autódromo José Carlos Pace - Grand Prix | Races every other Saturday at 4 & 15 GMT and Sunday at 0 GMT, 20 GMT | Rolling 120 mins | |
| 12 | IMSA iRacing Series - Fixed by GO Fast - 2026 Season 4 | Autodromo Nazionale Monza - Grand Prix | Races every 2 hours at :45 past | Rolling 35 mins | |
| 12 | IMSA iRacing Series by GO Fast - 2026 Season 4 | Autodromo Nazionale Monza - Grand Prix | Races every 2 hours at :45 past | Rolling 45 mins | |
| 12 | IMSA Vintage Series - 2026 Season 4 | Autodromo Internazionale del Mugello - Grand Prix | Races every 2 hours on the hour | Rolling 40 mins | |
| 6 | IMSA Michelin Pilot Challenge - 2026 Season 4 | Circuit de Spa-Francorchamps - Grand Prix Pits | Races every other Saturday at 4 & 15 GMT and Sunday at 0 GMT, 20 GMT | Rolling 120 mins |