To attract mates, male grackles will surround and follow one female and perform different displays in order to attract the female. This includes puffing out their chests and feathers. As mating continues, the female will eliminate the males until there is just one left that she has chosen to mate with.
Female grackles will lay 4-7 eggs that will then hatch after 13-14 days. Young chicks will then leave the nest after 12 to 16 days after they have hatched. The male will guard the nest during the time that the female is feeding the young chicks. Males may choose to pair with another female during this time.