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Best Answer: Female cats typically have their first heat around the age of six months, which usually lasts for 5 to 7 days. Cat's heat cycles are light dependent and they usually have heat cycles every 9 to 13 days from January through October, though some indoor cats exposed to constant light times will cycle all year.I advise unless you want kittens to keep her in at these times.Source(s): http://www.bestfriendspetcare.com/Pet_FA...at's heat cycles are light dependent and they usually have heat cycles every 9 to 13 days from January through October, though some indoor cats exposed to constant light times will cycle all year. I advise unless you want kittens to keep her in at these times. Source(s): http://www.bestfriendspetcare.com/Pet_FA...
Cats can breed nearly year-round, from late winter into early autumn, with the heaviest kitten season running from March through September. Especially during the increased daylight hours associated with spring and summer, a cat will go into heat every 14 to 21 days for about seven to 10 days. She will display frustration and irritability until she mates or is spayed -- or until the darker days of autumn.