The session was red flagged before anyone had set a representative time with only nine minutes on the clock, as Dalton Kellett had stopped his AJ Foyt Racing-Chevrolet off-track down at Turns 12/13, and needed a tow-in.
By then, Chip Ganassi Racing’s Scott Dixon had already been off the road at Turn 3, and when action resumed, he threw a block on championship leader Pato O’Ward which the Mexican teenager could only avoid by locking up his front tires into Canada Corner. The Arrow McLaren SP-Chevrolet driver described the move as ‘not cool’.
Dixon eventually set a 1min47.6457sec lap, just 0.015sec behind Herta’s best efforts on alternates in the Andretti Autosport-Honda, and ahead of Graham Rahal’s Rahal Letterman Lanigan-Honda, but all eyes were on Josef Newgarden’s pace on blacks, for tomorrow’s polesitter appeared to have the least drop-off of any of the front runners.
Jimmie Johnson was an impressive 14th fastest, just 1.7sec off top spot, while debutants Kevin Magnussen and Cody Ware were 20th and 24th, 2.7sec and 3.2sec from P1, but sandwiching previous Road America winners Sebastien Bourdais and Will Power.
Tomorrow’s 55-lap race starts at 11.38 local (Central time).
| P | Name | FTime | Diff | Gap | FL | Laps | FSpeed | Engine | Tire | Team |
| 1 | Colton Herta | 1:47.6312 | 1:47.6312 | 0.000 | 10 | 11 | 134.258 | Honda | A | Andretti Autosport |
| 2 | Scott Dixon | 1:47.6457 | 0.0145 | 0.0145 | 8 | 10 | 134.240 | Honda | P | Chip Ganassi Racing |
| 3 | Graham Rahal | 1:47.6707 | 0.0395 | 0.0250 | 10 | 12 | 134.209 | Honda | P | Rahal Letterman Lanigan Racing |
| 4 | Josef Newgarden | 1:48.0311 | 0.3999 | 0.3604 | 5 | 13 | 133.761 | Chevy | P | Team Penske |
| 5 | Max Chilton | 1:48.0533 | 0.4221 | 0.0222 | 11 | 12 | 133.734 | Chevy | A | Carlin |
| 6 | Takuma Sato | 1:48.0825 | 0.4513 | 0.0292 | 11 | 12 | 133.698 | Honda | A | Rahal Letterman Lanigan Racing |
| 7 | Ed Jones | 1:48.3273 | 0.6961 | 0.2448 | 7 | 11 | 133.396 | Honda | P | Dale Coyne Racing with Vasser Sullivan |
| 8 | Ryan Hunter-Reay | 1:48.4105 | 0.7793 | 0.0832 | 10 | 12 | 133.293 | Honda | P | Andretti Autosport |
| 9 | Alexander Rossi | 1:48.5355 | 0.9043 | 0.1250 | 12 | 12 | 133.140 | Honda | P | Andretti Autosport |
| 10 | Pato O'Ward | 1:48.6691 | 1.0379 | 0.1336 | 7 | 11 | 132.976 | Chevy | P | Arrow McLaren SP |
| 11 | Marcus Ericsson | 1:48.6872 | 1.0560 | 0.0181 | 5 | 12 | 132.954 | Honda | P | Chip Ganassi Racing |
| 12 | Jack Harvey | 1:49.1575 | 1.5263 | 0.4703 | 9 | 10 | 132.381 | Honda | A | Meyer Shank Racing |
| 13 | Romain Grosjean | 1:49.3094 | 1.6782 | 0.1519 | 9 | 9 | 132.197 | Honda | P | Dale Coyne Racing w/Rick Ware Racing |
| 14 | Jimmie Johnson | 1:49.3575 | 1.7263 | 0.0481 | 8 | 12 | 132.139 | Honda | P | Chip Ganassi Racing |
| 15 | Scott McLaughlin | 1:49.5698 | 1.9386 | 0.2123 | 10 | 11 | 131.883 | Chevy | P | Team Penske |
| 16 | James Hinchcliffe | 1:49.6176 | 1.9864 | 0.0478 | 12 | 12 | 131.826 | Honda | P | Andretti Steinbrenner Autosport |
| 17 | Alex Palou | 1:49.7748 | 2.1436 | 0.1572 | 7 | 12 | 131.637 | Honda | P | Chip Ganassi Racing |
| 18 | Oliver Askew | 1:49.7888 | 2.1576 | 0.0140 | 9 | 13 | 131.620 | Chevy | A | Ed Carpenter Racing |
| 19 | Simon Pagenaud | 1:49.8772 | 2.2460 | 0.0884 | 12 | 13 | 131.514 | Chevy | P | Team Penske |
| 20 | Kevin Magnussen | 1:50.3183 | 2.6871 | 0.4411 | 8 | 8 | 130.988 | Chevy | P | Arrow McLaren SP |
| 21 | Conor Daly | 1:50.3574 | 2.7262 | 0.0391 | 9 | 10 | 130.942 | Chevy | P | Ed Carpenter Racing |
| 22 | Sebastien Bourdais | 1:50.4579 | 2.8267 | 0.1005 | 8 | 13 | 130.823 | Chevy | P | AJ Foyt Enterprises |
| 23 | Will Power | 1:50.5149 | 2.8837 | 0.0570 | 7 | 12 | 130.755 | Chevy | P | Team Penske |
| 24 | Cody Ware | 1:50.8162 | 3.1850 | 0.3013 | 5 | 12 | 130.400 | Honda | P | Dale Coyne Racing w/Rick Ware Racing |
| 25 | Dalton Kellett | 1:51.7604 | 4.1292 | 0.9442 | 1 | 1 | 129.298 | Chevy | P | AJ Foyt Enterprises |
