The breeding season for whitetail deer in Ohio is typically throughout the month of October; however, sometimes whitetail deer breed in December. Usually the younger bucks or the weaker bucks are the ones that must breed in December, according to the University of Wisconsin.
During the mating season, the buck starts to look for does to mate with. The courtship between the two takes places over approximately one week. A doe needs 187 to 222 days of gestation before the fawn is born and often has one fawn in her first pregnancy with two to three fawns in subsequent pregnancies, according to the Ohio Department of Natural Resources. The timing of the mating season is important because it means that all baby fawns are born during the early summer and can grow before the frigid Ohio winter.