The 2019 Auto Club 400 was a Monster Energy NASCAR Cup Series race that was held on March 17, 2019, at Auto Club Speedway in Fontana, California. Contested over 200 laps on the D-shaped oval, it was the fifth race of the 2019 Monster Energy NASCAR Cup Series season. The race was won by Kyle Busch, his 200th win across all three of NASCAR's national divisions.
Auto Club Speedway (previously California Speedway) was a , low-banked, D-shaped oval superspeedway in Fontana, California which hosted NASCAR racing annually from 1997 to 2023. It was also used for open wheel racing events. The racetrack was located near the former locations of Ontario Motor Speedway and Riverside International Raceway. The track was owned and operated by International Speedway Corporation and was the only track owned by ISC to have its naming rights sold. The speedway was served by the nearby Interstate 10 and Interstate 15 freeways as well as a Metrolink station located behind the backstretch.
Jimmie Johnson was the fastest in the first practice session with a time of 40.137 seconds and a speed of .
Austin Dillon scored the pole for the race with a time of 39.982 and a speed of after no drivers completed a lap in the final round of qualifying.
Kevin Harvick was the fastest in the second practice session with a time of 40.940 seconds and a speed of .
Brad Keselowski was the fastest in the final practice session with a time of 40.759 seconds and a speed of .
Stage One Laps: 60
Stage Two Laps: 60
Stage Three Laps: 80
The race was the 19th race Fox Sports covered at the Auto Club Speedway. Mike Joy, three-time Auto Club winner Jeff Gordon and Darrell Waltrip called the race in the booth for Fox. Jamie Little, Vince Welch and Matt Yocum handled the pit road duties for the television side.
MRN had the radio call for the race which was also simulcasted on Sirius XM NASCAR Radio. Alex Hayden, Jeff Striegle and 2001 race winner Rusty Wallace called the race from the booth when the field raced their way down the front stretch. Kyle Rickey called the race from a billboard outside turn 2 when the field raced their way through turns 1 and 2 & Dan Hubbard called the race from a billboard outside turn 3 when the field raced their way through turns 3 and 4. Winston Kelley, Steve Post and Dillon Welch had the pit road duties for MRN.