Timeline:May

May 1:

May 2:

May 3: May 4:

May 5: May 6:
 * 2013: James Hinchcliffe won his second IndyCar race.

May 7:

May 8:

May 9: May 10: May 11:
 * 2015: The Angie's List Grand Prix of Indianapolis was won by Will Power.
 * 1975: Hélio Castroneves was born.
 * 2014: The Grand Prix of Indianapolis was won by Simon Pagenaud.

May 12:

May 13: May 14: May 15:
 * 2015: Hélio Castroneves' car went airborne for the 2015 Indy 500 practice.
 * 2015: Josef Newgarden's car went airborne for the 2015 Indy 500 practice.

May 16:

May 17:

May 18:
 * 1984: Simon Pagenaud was born.
 * 2015: James Hinchcliffe crashed extremely hard in Indy 500 practice.

May 19:

May 20:

May 21:

May 22: May 23:
 * 1987: Mikhail Aleshin was born.

May 24: May 25: May 26: May 27:
 * 2015: Juan Pablo Montoya won the Indy 500.
 * 2009: Hélio Castroneves won the Indy 500.
 * 2014: Ryan Hunter-Reay won the Indy 500 by a close margin and denied DWTS season 5 winner Helio Castroneves his fourth.
 * 2008: Scott Dixon won the Indy 500.
 * 2013: Tony Kanaan won the Indy 500 after multiple tries.

May 28:

May 29:
 * 2016: The 100th Indy 500 will be held.

May 30: May 31:
 * 2015: Carlos Munoz won his first IndyCar race in a shortened and rainy Detroit race 1.
 * 2015: Sébastien Bourdais won his first race of the 2015 season in a shortened 68 lap race. Had Helio Castroneves/Will Power not happen, it would have been 70 laps.
 * 2014: Will Power won Detroit Race 1.