How Long Are Cats in Heat? (And How Often Do Cats Go Into Heat?)

If your feline companion has suddenly transformed into a vocal, restless pet demanding constant attention, you’re likely witnessing a cat in heat. Knowing how long a heat cycle lasts and how often it repeats helps you support your cat and manage her behaviour with confidence. This complete guide covers everything you need to know about feline reproductive cycles, from spotting the early signs to practical, effective ways to soothe your pet.

A female cat in heat - known medically as estrus - is in the fertile phase of her reproductive cycle. During this window, elevated estrogen levels prompt her to actively seek a mate.

Cats are seasonally polyestrous, meaning they enter recurring heat cycles throughout their breeding season unless they become pregnant or are spayed. In the UK, daylight hours trigger these reproductive hormones, so the primary breeding season usually runs from late winter through to autumn. However, indoor cats exposed to artificial lighting can experience heat cycles at any point during the year.

Most female cats experience their first heat cycle when they reach sexual maturity at around six months of age. A young cat can enter her first cycle as early as four months or as late as ten months old, depending on her breed, body weight, and season of birth.

For a cat experiencing her first heat, the active phase usually lasts between 4 and 7 days, following the same timeline as subsequent cycles. Cat breeds play a significant role in timing. Lighter, oriental breeds such as Siamese cats often reach puberty much earlier, whereas larger, heavy-boned breeds like Maine Coons may not experience their first cycle until they are closer to one year old.

If a cat mates and conceives, her reproductive cycle halts immediately for the duration of the pregnancy. If you suspect your cat may have mated while outdoors, read our companion guide on how to tell if you have a pregnant cat to recognise early gestation signs. If she mates without conceiving, she may enter a phase called pseudopregnancy (false pregnancy), which lasts roughly 3 to 4 weeks before her hormone levels reset and the heat cycle begins again.

An unspayed female cat goes into heat every 2 to 3 weeks throughout the breeding season if she does not mate. Understanding the feline heat cycle involves looking at four distinct biological phases.

The entire cat heat cycle consists of distinct stages:

1. Proestrus (1–2 days): The subtle beginning. Her body prepares, and she may display extra affection, but she will not yet allow a male cat near her.

2. Estrus (4–7 days): The main stage where she actively seeks a mate and shows obvious physical and behavioural signs.

3. Interestrus (1–2 weeks): The rest period between cycles if she does not mate. Her hormone levels drop, and her behaviour returns to normal until the next cycle begins.

4. Anestrus: The dormant winter phase where reproductive activity pauses due to shorter daylight hours.

Identifying whether a cat is in heat relies on observing specific vocal, posture, and behavioural changes. Early signs include loud, persistent vocalising, often heard as a distinctive, low-pitched calling designed to attract roaming males. You will also notice increased restlessness, with your cat pacing near windows and doors or attempting to slip outside.

She will demonstrate exaggerated affection by constantly rubbing her head, neck, and flanks against furniture, your legs, or other household pets. A key physical indicator is the lordosis posture, where she crouches on her front legs, raises her hindquarters into the air, and shifts her tail to one side. This position is frequently paired with treadling, where her rear paws rhythmically step up and down. Some cats also exhibit territorial scent marking, spraying small amounts of urine on vertical surfaces indoors to broadcast their presence to males.

Helping a cat in heat involves minimising environmental stressors, keeping her safely contained, and providing comforting outlets for her heightened nervous energy. 

To calm a cat in heat immediately, combine gentle physical warmth with a quiet, isolated, low-stress environment. Placing a warm water bottle wrapped in a fleece blanket inside her bed helps settle her physical restlessness, while extra grooming sessions with a soft brush can soothe her nerves if she enjoys handling.

Creating a calm space away from ground-floor windows helps prevent her from spotting or smelling roaming neighbourhood tomcats, which significantly reduces distress. Engaging her in vigorous interactive play sessions with feather teasers right before mealtime can also help burn off frantic hormonal energy and encourage sleep.

While practical care methods provide temporary comfort, spaying (neutering) is the safest and most effective long-term solution for your cat's health and wellbeing. Spaying involves the surgical removal of the ovaries and uterus, which permanently eliminates heat cycles, unwanted vocalising, and escape attempts.

Beyond preventing unwanted litters, spaying delivers critical medical benefits throughout a cat's life. It completely removes the risk of pyometra, a severe and potentially fatal uterine infection. It also significantly lowers the incidence of mammary tumours and ovarian cancers, while keeping unwanted stray males away from your home and garden. UK vets generally recommend spaying around four months of age, ideally before her first heat cycle begins, though the procedure can be performed safely at any age.

Looking after your cat means having access to reliable advice, healthcare solutions, and nutritious food. Explore our full range of cat food, search our high-quality cat flea and worm treatments, or browse our complete cat healthcare and grooming collection to keep your pet healthy, comfortable, and happy through every stage of life.