The 2019 Production Alliance Group 300 was a NASCAR Xfinity Series race held on March 16, 2019, at Auto Club Speedway in Fontana, California.

Contested over 150 laps on the two-mile (3.2 km) D-shaped oval, it was the fifth race of the 2019 NASCAR Xfinity Series season.

Cole Custer was the fastest in the first practice session with a time of 40.669 seconds and a speed of 177.039 mph (284.917 km/h).

[4][5] Justin Allgaier was the fastest in the final practice session with a time of 40.436 seconds and a speed of 178.059 mph (286.558 km/h).

[5] Tyler Reddick scored the pole for the race with a time of 40.031 seconds and a speed of 179.861 mph (289.458 km/h).