RADIO
NASCAR practice speeds, lap averages and notes for the 2025 Iowa Corn 350 at Iowa Speedway. Use the NASCAR stats and data to build DFS lineups on DraftKings.
The NASCAR Cup Series ran a single practice session at Iowa Speedway on Saturday afternoon in preparation for the upcoming Iowa Corn 350 on Sunday afternoon.
The 37-car field was split into two groups for practice, with each group getting 25 minutes on track.
Below you will find the two groups, key notes from the practice session, as well as the practice speeds for all drivers.
Important Practice Notes
Kyle Busch - The No. 8 team will be preparing a backup car after Kyle Busch had an issue and went straight into the wall, demolishing his primary car.
There's big trouble in practice for @KyleBusch.
Kyle climbed from the No. 8 under his own power. pic.twitter.com/VreIpf8qJe
— NASCAR (@NASCAR) August 2, 2025
Chase Elliott - The No. 9 Chevrolet was very strong during the practice session on Saturday, as Chase Elliott ranked fastest in 20-, 25-, and 30-lap average among all drivers.
2025 Iowa Corn 350 Practice Speed Chart
Click here to download the PDF of the practice speed chart.
| Rank | Driver | Time | Speed | Fastest Lap | Laps Ran |
Behind Leader
|
| 1. | Christopher Bell | 23.511 | 133.980 | 9 | 39 | ---.--- |
| 2. | Bubba Wallace | 23.526 | 133.894 | 9 | 40 | -0.015 |
| 3. | Chase Briscoe | 23.546 | 133.781 | 19 | 41 | -0.035 |
| 4. | William Byron | 23.551 | 133.752 | 12 | 43 | -0.040 |
| 5. | Kyle Larson | 23.564 | 133.678 | 8 | 39 | -0.053 |
| 6. | Tyler Reddick | 23.571 | 133.639 | 19 | 41 | -0.060 |
| 7. | Alex Bowman | 23.575 | 133.616 | 18 | 31 | -0.064 |
| 8. | Brad Keselowski | 23.578 | 133.599 | 15 | 22 | -0.067 |
| 9. | Chase Elliott | 23.591 | 133.525 | 9 | 51 | -0.080 |
| 10. | Denny Hamlin | 23.596 | 133.497 | 9 | 46 | -0.085 |
| 11. | Chris Buescher | 23.615 | 133.390 | 25 | 36 | -0.104 |
| 12. | Austin Cindric | 23.623 | 133.345 | 4 | 39 | -0.112 |
| 13. | Justin Haley | 23.632 | 133.294 | 27 | 45 | -0.121 |
| 14. | Ty Gibbs | 23.633 | 133.288 | 9 | 38 | -0.122 |
| 15. | Ryan Blaney | 23.639 | 133.254 | 8 | 42 | -0.128 |
| 16. | Carson Hocevar | 23.648 | 133.204 | 5 | 28 | -0.137 |
| 17. | Kyle Busch | 23.658 | 133.147 | 13 | 17 | -0.147 |
| 18. | Ross Chastain | 23.662 | 133.125 | 25 | 38 | -0.151 |
| 19. | Ty Dillon | 23.671 | 133.074 | 17 | 33 | -0.160 |
| 20. | Austin Dillon | 23.671 | 133.074 | 20 | 31 | -0.160 |
| 21. | Shane Van Gisbergen | 23.691 | 132.962 | 24 | 43 | -0.180 |
| 22. | AJ Allmendinger | 23.694 | 132.945 | 13 | 36 | -0.183 |
| 23. | John Hunter Nemechek | 23.709 | 132.861 | 6 | 46 | -0.198 |
| 24. | Erik Jones | 23.732 | 132.732 | 33 | 39 | -0.221 |
| 25. | Cody Ware | 23.772 | 132.509 | 4 | 24 | -0.261 |
| 26. | Riley Herbst | 23.786 | 132.431 | 18 | 38 | -0.275 |
| 27. | Daniel Suarez | 23.786 | 132.431 | 7 | 23 | -0.275 |
| 28. | Michael McDowell | 23.786 | 132.431 | 26 | 35 | -0.275 |
| 29. | Ryan Preece | 23.792 | 132.397 | 3 | 28 | -0.281 |
| 30. | Zane Smith | 23.829 | 132.192 | 25 | 31 | -0.318 |
| 31. | Todd Gilliland | 23.846 | 132.098 | 9 | 24 | -0.335 |
| 32. | Ricky Stenhouse Jr. | 23.853 | 132.059 | 9 | 37 | -0.342 |
| 33. | Josh Berry | 23.868 | 131.976 | 18 | 24 | -0.357 |
| 34. | Noah Gragson | 23.874 | 131.943 | 8 | 21 | -0.363 |
| 35. | Cole Custer | 24.008 | 131.206 | 21 | 24 | -0.497 |
| 36. | Joey Logano | 24.033 | 131.070 | 2 | 32 | -0.522 |
| 37. | Joey Gase | 25.103 | 125.483 | 20 | 20 | -1.592 |
2025 Iowa Corn 350 10-Lap Average Chart
| Rank | Driver | From Lap | To Lap | Avg Speed |
| 1. | William Byron | 8 | 17 | 133.211 |
| 2. | Denny Hamlin | 5 | 14 | 133.090 |
| 3. | Kyle Larson | 24 | 33 | 133.074 |
| 4. | Chase Elliott | 13 | 22 | 133.037 |
| 5. | Alex Bowman | 17 | 26 | 133.031 |
| 6. | Ryan Blaney | 14 | 23 | 132.798 |
| 7. | Brad Keselowski | 2 | 11 | 132.767 |
| 8. | Justin Haley | 19 | 28 | 132.754 |
| 9. | Ty Gibbs | 5 | 14 | 132.700 |
| 10. | Chase Briscoe | 16 | 25 | 132.690 |
| 11. | Bubba Wallace | 3 | 12 | 132.675 |
| 12. | Austin Cindric | 10 | 19 | 132.532 |
| 13. | Chris Buescher | 13 | 22 | 132.435 |
| 14. | Christopher Bell | 19 | 28 | 132.426 |
| 15. | John Hunter Nemechek | 4 | 13 | 132.412 |
| 16. | Ross Chastain | 12 | 21 | 132.395 |
| 17. | Erik Jones | 19 | 28 | 132.283 |
| 18. | Tyler Reddick | 10 | 19 | 132.097 |
| 19. | AJ Allmendinger | 4 | 13 | 132.091 |
| 20. | Shane Van Gisbergen | 34 | 43 | 131.925 |
| 21. | Carson Hocevar | 1 | 10 | 131.837 |
| 22. | Austin Dillon | 6 | 15 | 131.792 |
| 23. | Ty Dillon | 3 | 12 | 131.729 |
| 24. | Michael McDowell | 4 | 13 | 131.686 |
| 25. | Riley Herbst | 9 | 18 | 131.412 |
| 26. | Ricky Stenhouse Jr. | 4 | 13 | 131.388 |
| 27. | Todd Gilliland | 14 | 23 | 131.333 |
| 28. | Daniel Suarez | 11 | 20 | 131.299 |
| 29. | Zane Smith | 22 | 31 | 131.265 |
| 30. | Ryan Preece | 1 | 10 | 131.229 |
| 31. | Josh Berry | 15 | 24 | 131.140 |
| 32. | Cody Ware | 15 | 24 | 129.338 |
| 33. | Joey Logano | 18 | 27 | 128.744 |
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