NASCAR Xfinity Series at Auto Club Speedway
Stock car races in the then-NASCAR Xfinity Series were held at Auto Club Speedway in Fontana, California from 1997 to 2023. The race was held as a 150 lap, 300 mile race.
A second race at the track was also held during the fall as support to the Cup fall race from 2004 until the track lost its second Cup date after 2010.
No races have been held since 2023, as the track is currently undergoing demolition of the 2-mile oval.