how long is a female cat in heat?

Answer 1

As long as she needs to be to get pregnant, basically. She'll come back into heat every 2-3 weeks until mated.

Unlike dogs, cats are easy to spay when in season so don't let her being in season stop you making the vet appointment to get her spayed, it's very necessary!! Do NOT let her outside until this is done - cats are induced ovulators, they don't even need to to be heat to get pregnant.

Chalice

Answer 2

The cat stays in heat for normally 4-6 days and during the summer season will come in heat again every 2-3 weeks. These periods may vary widely. The cat will come out of heat and the cycles will end once the cat has mated or the season ends. After giving birth a female cat may come in heat again in as soon as 7 days although this usually happens after about 4 weeks.