Female Cat Heat Duration
How Long Does the Heat Cycle Last?

by Mary Fariss

Question: How Long Does the Cat Heat Cycle Last?

Non-spayed female cats will go into "heat" or oestrus seasonally in the spring and fall, and may go into heat several times during the season. An intact (not spayed) female cat of reproductive age is called a queen. Learn more facts about feline oestrus in this FAQ.

Answer: There are five stages to the cat heat oestrus cycle:

Proestrus: Not many signs are seen in the cat for this stage. The female is attractive to the male, but unwilling to mate. Length: 1-2 days.

Oestrus: This is when the female cat is receptive to the male. External signs such as a swollen vulva or bloody discharge, but these can be very slight and so are not as obvious in the cat as they are in the dog. The main signs seen are behavioral -- loud vocalizing, rolling on the floor, elevating the hindquarters and possibly a decrease in appetite. Many people have confused the signs of the feline estrus phase as signs of being in pain. Length: 3-14 days (average of one week). If the female is not mated, she may go back into heat within several days.

picture by rkimpeljr

Interestrus:The period between oestrus cycles if the female isn't bred. Length: 2-3 weeks.
Metestrus (or Diestrus): period after oestrus or mating. Length: 30-40 days. If pregnant, pregnancy lasts on average 60-64 days in the cat.

Anestrus: period of inactivity (sexual and hormonal) between oestrus phases. Length: 2-3 months.
Some general "rules of thumb" for feline oestrus:

• The first oestrus cycle usually occurs by age 6-12 months; for some cats as early as four months of age, for others not until age 12 months or so.
  
  
• Cats are considered to be seasonal breeders; most often showing signs of mating behavior in the spring and fall.
  
  
• Cats are induced ovulators, meaning that they only ovulate (release an egg from the ovary) if mated.
  
  
• If not mated (no ovulation), the oestrus phase of the cycle will return in 1 - 3 weeks.
  
  
• Multiple matings produce more ovulations; more than one male can be the sire of a litter.
  
  
• Cats can get pregnant during their first heat cycle, but this is not advisable as a 6-month old cat is not yet fully grown/mature, and complications for the mother and the kittens are more likely.

For cats that will be pets, it is recommended to spay them before the first heat, eliminating the risk of accidental pregnancy and reproductive diseases later on in life. Cats may be spayed while in heat (or pregnant), but there is additional risk due to the engorged vessels and tissue of the reproductive tract -- a higher chance of bleeding during surgery or other complications. The cost of surgery while in heat or pregnant is often higher as well.

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