In first practice, Bakersfield, California native Harvick ran the fastest of his twenty two laps at a time of 40.940 seconds, at just under 176 mph.
Some drivers attempted to bump draft during the session, but the session saw mostly single-file runs throughout the 55-minute practice session.
Pole winner Austin Dillon was ninth quickest with a lap of 41.662 sec at 174.919 mph.
Kyle Larson bumped the wall during the session but it was not enough to bring out the caution. He will not need to go to a back-up car.
— CGR NASCAR Teams (@CGRnascar) March 16, 2019
Keselowski’s Wurth Ford also turned the fastest speed of the session at 176.648 MPH with Hemric right behind him at 176.548 MPH.
The 23rd Annual Auto Club 400 will be LIVE on Fox at 3:30 PM ET with the green flag waving around 3:47 PM ET.