Auto Club Speedway, originally opened as California Speedway, is a 2.000 mi (3.219 km), low-banked, D-shaped oval superspeedway in unincorporated San Bernardino County, California, near Fontana. It has hosted NASCAR racing annually since 1997. It was also previously used for open wheel racing events. The racetrack is located 47 mi (76 km) east of Los Angeles and is near the former locations of Ontario Motor Speedway and Riverside International Raceway. The track is owned and operated by NASCAR. The speedway is served by the nearby Interstate 10 and Interstate 15 freeways as well as a Metrolink station located behind the backstretch.
Construction of the track, on the site of the former Kaiser Steel Mill, began in 1995 and was completed in late 1996. The speedway’s main grandstand has a capacity of 68,000, additionally, it features 28 skyboxes and has a grand total capacity of 122,000. In 2006, a fanzone was added behind the main grandstand. Lights were added to the speedway in 2004 with the addition of a second annual NASCAR weekend. Since 2011, the track has hosted only one NASCAR weekend each year.
IndyCar previously ran a 500-mile race under Champ Car sanctioning from 1997 to 2002. The current IndyCar sanctioning previously ran a 400-mile race from 2002 to 2005 and a 500-mile race from 2012 to 2015.