Stock car racing events in the NASCAR Xfinity Series has been held at the Auto Club Speedway in Fontana, California since the track's inauguration in 1997. The 300-mile (480 km) event is currently named Production Alliance Group 300 for sponsorship reasons since 2019. The race is usually scheduled in late March as the fifth event of the schedule and as a support event for the NASCAR Cup Series' Auto Club 400. It has previously been held in October and late April or early May. Cole Custer is the defending winner of the event, after winning it in 2022.