Kalendar Perlumbaan Litar Antarabangsa Sebring 2018
| Tarikh | Siri Perlumbaan | Bulatan | Nama Acara |
|---|---|---|---|
| 1 Mac - 4 Mac | Piala Porsche GT3 Piala Amerika Syarikat Selesai | Round 1 | |
| 14 Mac - 17 Mac | IMSA SportsCar Championship Selesai | Round 2 | Mobil 1 Twelve Hours of Sebring |
| 9 November - 11 November | IMSA SportsCar Championship Selesai | Non-championship round |