On October 7, 2014, it was announced that Hinchcliffe would join Schmidt Peterson Motorsports for the 2015 season and drive the No. 5 car, filling the open seat left by Simon Pagenaud. He won his first race with the team in the second race of the year in New Orleans. Hinchcliffe sustained serious injuries in a crash caused by a suspension failure during practice for the 2015 Indianapolis 500, on May 18. He remained hospitalized during the race and Ryan Briscoe took Hinchcliffe's position for the race. Briscoe and Conor Daly replaced Hinchcliffe in the car for the remainder of the 2015 season.