If you’re a parent of a female cat, you’ve probably heard the phrase ‘in heat’ before. In short, it refers to when your feline friend is fertile and ready to mate. It also comes with behavior changes that can be difficult to deal with if you’re not prepared. If you’re asking yourself, “how long are cats in heat?” in exasperation, we’re here to help! Keep reading to find out how long your cat will be in heat, what symptoms to look for, and how to keep them comfortable throughout their cycles.