For the second straight session, James Hinchcliffe and Colton Herta finished 1-2 on the speed chart. Hinchcliffe improved his time from yesterday afternoon to 1:08.7351, about two tenths quicker than his Practice 2 time. Herta was 0.27 seconds behind him. Spencer Pigot was once again the fastest Chevrolet with the seventh fastest time.
The session was interrupted by three red flags. The first was Zach Veach, who locked up the brakes and slid into the gravel trap in turn 5. When action resumed, Jack Harvey put his right side wheels into the dirt in turn 2, throwing grass and dirt onto the track. Ryan Hinter-Reay was the next car through and went off track in turn 3 but continued. Marcus Ericsson followed but was not as fortunate. He slid into the ARMCO in turn 2. The car suffered front wing damage. Following a restart, Graham Rahal also locked up and slid into the turn 5 gravel trap.
The session timed out but Indycar allowed the field one flying lap.