iRacing GTP Calendar
7 matching series across 64 scheduled series-weeks, including 2 fixed-setup series. Browse every published week, track and race cadence.
2026 Season 4 · 7 seriess · 21 track configurations · 19 cars · 2 fixed-setup series
Categories: SPORTS CAR. Published week starts run from to . The most-scheduled configuration is Circuit des 24 Heures du Mans - 24 Heures du Mans, used for 6 series-weeks.
Series in this calendar
- Global Endurance Tour - 2026 Season 4
- 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 Vintage Series - 2026 Season 4
- iTested Series - 2026 Season 4
- Prototype Challenge - 2026 Season 4 - Fixed
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 | Prototype Challenge - 2026 Season 4 - Fixed | Indianapolis Motor Speedway - Road Course | Races every 2 hours at :00 | Rolling 20 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 | |
| 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 | |
| 2 | Prototype Challenge - 2026 Season 4 - Fixed | Road Atlanta - Full Course | Races every 2 hours at :00 | Rolling 20 mins | |
| 1 | Global Endurance Tour - 2026 Season 4 | Indianapolis Motor Speedway - Road Course | Races every other Saturday at 7, 18 GMT and Sunday at 14 GMT | Rolling 360 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 | |
| 3 | Prototype Challenge - 2026 Season 4 - Fixed | Fuji International Speedway - Grand Prix | Races every 2 hours at :00 | Rolling 20 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 | |
| 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 | |
| 4 | Prototype Challenge - 2026 Season 4 - Fixed | Red Bull Ring - Grand Prix | Races every 2 hours at :00 | Rolling 20 mins | |
| 2 | Global Endurance Tour - 2026 Season 4 | Red Bull Ring - Grand Prix | Races every other Saturday at 7, 18 GMT and Sunday at 14 GMT | Rolling 360 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 | |
| 5 | Prototype Challenge - 2026 Season 4 - Fixed | Long Beach Street Circuit | Races every 2 hours at :00 | Rolling 20 mins | |
| 1 | iTested Series - 2026 Season 4 | Circuit Gilles Villeneuve | Races every hour at :30 past | Rolling 30 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 | |
| 2 | iTested Series - 2026 Season 4 | Circuit Gilles Villeneuve | Races every hour at :30 past | Rolling 30 mins | |
| 3 | iTested Series - 2026 Season 4 | Circuit des 24 Heures du Mans - 24 Heures du Mans | Races every hour at :30 past | Rolling 30 mins | |
| 4 | iTested Series - 2026 Season 4 | Circuit des 24 Heures du Mans - 24 Heures du Mans | Races every hour at :30 past | Rolling 30 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 | |
| 6 | Prototype Challenge - 2026 Season 4 - Fixed | Circuit Gilles Villeneuve | Races every 2 hours at :00 | Rolling 20 mins | |
| 3 | Global Endurance Tour - 2026 Season 4 | Circuit Gilles Villeneuve | Races every other Saturday at 7, 18 GMT and Sunday at 14 GMT | Rolling 360 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 | |
| 7 | Prototype Challenge - 2026 Season 4 - Fixed | Circuit des 24 Heures du Mans - 24 Heures du Mans | Races every 2 hours at :00 | Rolling 20 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 | |
| 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 | |
| 8 | Prototype Challenge - 2026 Season 4 - Fixed | Autódromo Hermanos Rodríguez - Grand Prix | Races every 2 hours at :00 | Rolling 20 mins | |
| 4 | Global Endurance Tour - 2026 Season 4 | Autódromo Hermanos Rodríguez - Grand Prix | Races every other Saturday at 7, 18 GMT and Sunday at 14 GMT | Rolling 360 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 | |
| 9 | Prototype Challenge - 2026 Season 4 - Fixed | Suzuka International Racing Course - Grand Prix | Races every 2 hours at :00 | Rolling 20 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 | |
| 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 | |
| 10 | Prototype Challenge - 2026 Season 4 - Fixed | Silverstone Circuit - Grand Prix | Races every 2 hours at :00 | Rolling 20 mins | |
| 5 | Global Endurance Tour - 2026 Season 4 | Silverstone Circuit - Grand Prix | Races every other Saturday at 7, 18 GMT and Sunday at 14 GMT | Rolling 360 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 | |
| 11 | Prototype Challenge - 2026 Season 4 - Fixed | Sebring International Raceway - International | Races every 2 hours at :00 | Rolling 20 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 | |
| 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 | |
| 12 | Prototype Challenge - 2026 Season 4 - Fixed | Autodromo Nazionale Monza - Grand Prix | Races every 2 hours at :00 | Rolling 20 mins | |
| 6 | Global Endurance Tour - 2026 Season 4 | Autodromo Nazionale Monza - Grand Prix | Races every other Saturday at 7, 18 GMT and Sunday at 14 GMT | Rolling 360 mins |