Darlington #1 2021 Green Flag Speeds
| Rank | Driver | Finish | Green Flag Speed |
|---|---|---|---|
| 1 | Aric Almirola | 37 | 157.567 |
| 2 | Martin Truex Jr | 1 | 154.525 |
| 3 | Kyle Larson | 2 | 153.869 |
| 4 | Denny Hamlin | 5 | 153.673 |
| 5 | William Byron | 4 | 153.618 |
| 6 | Joey Logano | 13 | 153.607 |
| 7 | Kyle Busch | 3 | 153.598 |
| 8 | Ryan Blaney | 8 | 153.408 |
| 9 | Christopher Bell | 14 | 153.398 |
| 10 | Kevin Harvick | 6 | 153.381 |
| 11 | Tyler Reddick | 12 | 153.263 |
| 12 | Chase Elliott | 7 | 153.182 |
| 13 | Chris Buescher | 9 | 153.023 |
| 14 | Ryan Newman | 10 | 152.769 |
| 15 | Alex Bowman | 17 | 152.756 |
| 16 | Chase Briscoe | 11 | 152.489 |
| 17 | Austin Dillon | 16 | 152.486 |
| 18 | Ricky Stenhouse Jr | 20 | 152.473 |
| 19 | Bubba Wallace | 21 | 152.453 |
| 20 | Erik Jones | 18 | 152.442 |
| 21 | Corey Lajoie | 22 | 152.055 |
| 22 | Michael McDowell | 27 | 152.012 |
| 23 | Kurt Busch | 35 | 151.871 |
| 24 | Matt DiBenedetto | 19 | 151.835 |
| 25 | Ryan Preece | 25 | 151.764 |
| 26 | Ross Chastain | 15 | 151.728 |
| 27 | Brad Keselowski | 24 | 151.56 |
| 28 | Anthony Alfredo | 26 | 151.495 |
| 29 | Cole Custer | 36 | 150.573 |
| 30 | Daniel Suarez | 23 | 150.531 |
| 31 | Quin Houff | 30 | 149.933 |
| 32 | JJ Yeley | 29 | 149.774 |
| 33 | Justin Haley | 28 | 149.664 |
| 34 | Cody Ware | 34 | 149.465 |
| 35 | James Davison | 31 | 148.878 |
| 36 | BJ McLeod | 32 | 148.478 |
| 37 | Josh Bilicki | 33 | 147.587 |
