NASCAR Xfinity Series at Auto Club Speedway

Stock car races in the then-NASCAR [O'Reilly Auto Parts Series|NASCAR Xfinity Series] were held at Auto Club Speedway in Fontana, California from 1997 [NASCAR Busch Series|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.