Overview

The Auto Club 400 is a NASCAR Cup Series race contested at Auto Club Speedway in Fontana, California. Staged during the early portion of the NASCAR season, the event is part of a race weekend that typically includes an Xfinity Series support race the day before. The event has formed a regular component of the national stock-car racing calendar since the late 1990s.

Track characteristics

Auto Club Speedway is a wide, two-mile D-shaped oval that encourages multiple racing lines and high-speed competition. Its broad surface and long straightaways allow for drafting and side-by-side racing; tire wear, aero balance, and long green-flag runs often play a decisive role in how the Auto Club 400 unfolds. The track’s configuration rewards both engine power and handling, which makes car setup and pit strategy important.

History and development

The race debuted in the late 1990s and was originally contested at a 500-mile distance for many years. From 1997 through the 2010 season the event was run as a 500-mile race; beginning in 2011 the scheduled distance was reduced to 400 miles. The change in distance altered race strategy, pit stop planning, and fan expectations while keeping the event’s place on the national schedule.

Format, timing and significance

As a points-paying Cup Series event, the Auto Club 400 contributes to the championship standings and is closely watched by teams and manufacturers, particularly on the West Coast leg of the season. It typically appears as one of the early spring races, offering teams an opportunity to establish momentum. The race weekend format commonly pairs the Cup race with the NASCAR Xfinity Series on the preceding day.

Notable features and distinctions

  • The event was known for many years as a 500-mile race before the 2011 reduction to 400 miles, and older references sometimes use the longer distance name.
  • Its location in Southern California makes it one of the primary West Coast races on the NASCAR schedule.
  • Wide lanes and high speeds foster frequent multi-groove battles, highlighting both driving skill and team strategy.

For more information about the venue and current race details, see the track page and series information: Auto Club Speedway, Fontana, California, and the governing organization, NASCAR.