Kitten season is the time of year when the most kittens are born. It actually encompasses three seasons, beginning in early spring and extending through the summer into fall.
Kitten season generally peaks in late spring or early summer, and during this time, shelters and rescue organizations are flooded with homeless litters. The heat cycle in cats is regulated by the weather. Typically, cats experience three heat cycles per year, all during warm weather. In areas that are warm year-round, cats are known to go into heat four times a year. The heat cycle of a female cat repeats itself until she becomes pregnant.