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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...
Understanding a cat's heat cycle can help you plan a pregnancy or avoid one as you wish. A cat can go into heat about two to five times a year. Her first heat usually occurs at five to six months of age, but it may not occur until she is one year old. There is no actual mating season for cats. Domestication has obliterated the natural breeding cycle, so they can go into heat any time of year.