Most female cats have their first heat (estrus) at around 5–9 months old, with many hitting it close to 6 months. Some kittens can come into heat as early as 3–4 months, while a few may not cycle until up to about 12–18 months, depending on breed and other factors.

Quick Scoop

  • Typical age: Most cats reach their first heat at around 6 months of age.
  • Early starters: Some breeds, like Siamese and other shorthaired cats, may come into heat as early as 4 months.
  • Late bloomers: Longhaired cats and some individuals may not have a first heat until around 10–18 months, though this is less common.
  • Season and light: Many cats have their first season in the first spring after they are born, as increasing daylight can trigger cycles.

What “First Heat” Looks Like

When your cat does hit that first heat, you might notice:

  • Loud, persistent vocalizing (yowling) and restlessness.
  • Extra affection, rubbing on people and objects, and raising the hind end with the tail to the side.
  • Attempts to escape outdoors or lingering by windows and doors to find a mate.

How Often After the First Heat?

Once that first heat starts, cycles can be frequent:

  • Cats are seasonally polyestrous, meaning they can have many cycles during the breeding season (often spring through autumn).
  • Heats may recur every 2–3 weeks and last from a few days up to about two weeks if the cat is not bred or spayed.

Health and Spaying Angle

  • Vets commonly recommend spaying before the first heat (around 4–6 months) to prevent pregnancy and reduce risks like mammary tumors and pyometra.
  • If your kitten is under 4 months and showing “in-heat-like” behavior or if you are unsure whether she’s already had a heat, a vet check is the safest way to confirm her stage of development and plan spaying.

TL;DR: Most cats have their first heat around 6 months old, but the range runs roughly 4–12 months (sometimes up to 18), and spaying before that first heat is usually recommended.

Information gathered from public forums or data available on the internet and portrayed here.