when do female cats go into heat

Female cats usually go into heat for the first time around 5 to 9 months of age, though some kittens can start as early as 3 to 4 months or as late as 12 to 18 months depending on breed, weight, and environmental factors. Indoor cats may cycle year-round due to artificial lighting, while outdoor cats typically have seasonal heat cycles from spring to autumn. The heat cycle, also known as estrus, lasts about a week but can range from 3 to 14 days. During heat, female cats show behavioral signs like vocalizing, increased affection, restlessness, and adopting mating positions. This cycle repeats every 2 to 3 weeks unless the cat becomes pregnant or is spayed.