The 2019 IMSA Prototype Challenge is the fourteenth season of the IMSA Lites series and its successors and the third season as the IMSA Prototype Challenge. It began on 5 January at Daytona International Speedway, and concluded on 11 October at Road Atlanta. The IMSA Prototype Challenge series is for future IMSA WeatherTech SportsCar Championship drivers and veteran drivers alike. Entering its 14th season, IMSA Prototype Challenge shifts to a single-class, endurance race format in 2019 with six races held on North America’s most premier road courses. The series will continue to feature the global-spec LMP3 prototypes. The endurance format pairs two-drivers per car in a six race season.