Alex Bowman topped the first practice session for the NASCAR Cup Series Auto Club 400 at Auto Club Speedway.
Click to view practice speeds at NASCAR.com
Click to view speeds and best 10 consecutive averages (pdf)
| Pos | Car | Driver | Make | Time | Speed | Lap # | # Laps | -Fastest | -Next |
| 1 | 88 | Alex Bowman | Chevrolet | 40.125 | 179.439 | 23 | 23 | —.— | —.— |
| 2 | 42 | Kyle Larson | Chevrolet | 40.517 | 177.703 | 17 | 17 | -0.392 | -0.392 |
| 3 | 8 | Tyler Reddick # | Chevrolet | 40.539 | 177.607 | 21 | 21 | -0.414 | -0.022 |
| 4 | 1 | Kurt Busch | Chevrolet | 40.592 | 177.375 | 23 | 23 | -0.467 | -0.053 |
| 5 | 21 | Matt DiBenedetto | Ford | 40.768 | 176.609 | 3 | 24 | -0.643 | -0.176 |
| 6 | 48 | Jimmie Johnson | Chevrolet | 40.791 | 176.510 | 1 | 20 | -0.666 | -0.023 |
| 7 | 19 | Martin Truex Jr | Toyota | 40.791 | 176.510 | 20 | 20 | -0.666 | 0.000 |
| 8 | 47 | Ricky Stenhouse Jr | Chevrolet | 40.805 | 176.449 | 2 | 22 | -0.680 | -0.014 |
| 9 | 12 | Ryan Blaney | Ford | 40.882 | 176.117 | 3 | 28 | -0.757 | -0.077 |
| 10 | 2 | Brad Keselowski | Ford | 40.901 | 176.035 | 1 | 21 | -0.776 | -0.019 |
| 11 | 3 | Austin Dillon | Chevrolet | 40.944 | 175.850 | 3 | 23 | -0.819 | -0.043 |
| 12 | 11 | Denny Hamlin | Toyota | 40.955 | 175.803 | 3 | 27 | -0.830 | -0.011 |
| 13 | 22 | Joey Logano | Ford | 40.999 | 175.614 | 2 | 23 | -0.874 | -0.044 |
| 14 | 6 | Ross Chastain | Ford | 41.028 | 175.490 | 19 | 19 | -0.903 | -0.029 |
| 15 | 13 | Ty Dillon | Chevrolet | 41.074 | 175.293 | 1 | 14 | -0.949 | -0.046 |
| 16 | 43 | Bubba Wallace | Chevrolet | 41.114 | 175.123 | 3 | 19 | -0.989 | -0.040 |
| 17 | 37 | Ryan Preece | Chevrolet | 41.125 | 175.076 | 2 | 18 | -1.000 | -0.011 |
| 18 | 24 | William Byron | Chevrolet | 41.145 | 174.991 | 3 | 27 | -1.020 | -0.020 |
| 19 | 4 | Kevin Harvick | Ford | 41.146 | 174.987 | 2 | 21 | -1.021 | -0.001 |
| 20 | 14 | Clint Bowyer | Ford | 41.182 | 174.834 | 1 | 19 | -1.057 | -0.036 |
| 21 | 10 | Aric Almirola | Ford | 41.225 | 174.651 | 2 | 16 | -1.100 | -0.043 |
| 22 | 41 | Cole Custer # | Ford | 41.236 | 174.605 | 2 | 24 | -1.111 | -0.011 |
| 23 | 20 | Erik Jones | Toyota | 41.247 | 174.558 | 2 | 22 | -1.122 | -0.011 |
| 24 | 18 | Kyle Busch | Toyota | 41.295 | 174.355 | 4 | 27 | -1.170 | -0.048 |
| 25 | 34 | Michael McDowell | Ford | 41.311 | 174.288 | 2 | 23 | -1.186 | -0.016 |
| 26 | 9 | Chase Elliott | Chevrolet | 41.326 | 174.224 | 3 | 33 | -1.201 | -0.015 |
| 27 | 38 | John Hunter | Ford | 41.487 | 173.548 | 1 | 21 | -1.362 | -0.161 |
| 28 | 17 | Chris Buescher | Ford | 41.616 | 173.010 | 2 | 19 | -1.491 | -0.129 |
| 29 | 95 | Christopher Bell # | Toyota | 41.715 | 172.600 | 2 | 22 | -1.590 | -0.099 |
| 30 | 32 | Corey LaJoie | Ford | 41.719 | 172.583 | 2 | 18 | -1.594 | -0.004 |
| 31 | 15 | Brennan Poole # | Chevrolet | 42.359 | 169.976 | 3 | 24 | -2.234 | -0.640 |
| 32 | 52 | JJ Yeley | Ford | 42.365 | 169.952 | 2 | 3 | -2.240 | -0.006 |
| 33 | 96 | Daniel Suarez | Toyota | 42.690 | 168.658 | 1 | 15 | -2.565 | -0.325 |
| 34 | 77 | Reed Sorenson | Chevrolet | 42.855 | 168.008 | 2 | 2 | -2.730 | -0.165 |
| 35 | 53 | Joey Gase | Ford | 43.205 | 166.647 | 2 | 14 | -3.080 | -0.350 |
| 36 | 51 | Garrett Smithley | Chevrolet | 43.319 | 166.209 | 4 | 8 | -3.194 | -0.114 |
| 37 | 00 | Quin Houff # | Chevrolet | 43.510 | 165.479 | 2 | 19 | -3.385 | -0.191 |
| 38 | 66 | Timmy Hill | Toyota | 45.222 | 159.215 | 2 | 5 | -5.097 | -1.712 |
Click to view best lap averages at NASCAR.com
Best 10 Consecutive Lap Averages
| Pos | Car | Driver | From Lap | To Lap | Avg Speed |
| 1 | 88 | Alex Bowman | 1 | 10 | 175.278 |
| 2 | 1 | Kurt Busch | 1 | 10 | 174.065 |
| 3 | 41 | Cole Custer # | 1 | 10 | 172.183 |
| 4 | 19 | Martin Truex Jr | 7 | 16 | 171.578 |
| 5 | 4 | Kevin Harvick | 11 | 20 | 171.236 |
| 6 | 11 | Denny Hamlin | 17 | 26 | 169.729 |
| 7 | 9 | Chase Elliott | 24 | 33 | 167.443 |
