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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...
Once in heat, the fertile part of the cycle can last for anything between five and ten days, and as mentioned, the cycle will repeat on a regular basis unless the cat is spayed or conceives. How to tell when your cat is in heat. All cats are different, but it is usually fairly obvious when a female cat is in heat, as they will display a distinctive set of mating behaviours and often, undergo personality and temperament changes for the duration.