Cat Breeding Guide: Heat, Mating, Pregnancy to Queening
The whole cat breeding cycle in order, with the tools for each stage: heat detection, mating, the 65 days of pregnancy, queening, and weaning.
Quick Answer
A queen in season calls and cycles every 2 to 3 weeks, stays receptive about 3 to 7 days per heat, and carries kittens for 65 days (range 60 to 70). Ovulation is triggered by mating itself. Any month can work, so plan around kittening weather. Enter the mating date in the cat gestation calculator for exact dates and milestones.
1. Heat Cycle: The Calling Season
Queens in heat are impossible to miss: loud yowling, rolling on the floor, raising the hindquarters, and treading the back feet. Each heat lasts 3 to 7 days, and if she is not bred she comes back into heat every 2 to 3 weeks. Outdoor cats follow the long days of spring through fall, but indoor queens under house lights often cycle all year, which is why any month on the chart below can end in kittens.
Tools for this stage: cat heat cycle calculator
2. Breeding: Mating Triggers Ovulation
Cats are induced ovulators: the physical act of mating releases the eggs about a day or two later, rather than a set point in the cycle. That is why queens are mated several times across two or three days with a proven, tested tom, and why one brief escape outdoors can still produce a litter. Write down the first mating date, because the whole 65 day clock below is keyed to it.
Tools for this stage: how mating triggers ovulation and sets the due date
3. Pregnancy: The 65 Days
Gestation runs about 65 days from mating, with a normal range of 60 to 70. Morning sickness and pinking nipples show around week 3, the belly rounds out by week 5, and an ultrasound or a late-pregnancy X-ray confirms and counts the kittens. Switch her to kitten food from confirmation onward, since the litter does most of its growing in the final two weeks.
Tools for this stage: cat gestation calculator · how long cats are pregnant
4. Queening Prep: The Final Week
Set out a quiet nesting box lined with soft bedding a week or more before the due date, away from other pets and foot traffic. As delivery nears she turns restless, seeks small dark spaces, and grooms her belly constantly. Stage the kit now: clean towels, a thermometer, blunt scissors and thread for cords if needed, and the vet's after-hours number.
Tools for this stage: printable breeding records and kit checklists
5. Queening: Labor and When to Help
Stage one can run up to 12 hours of pacing, purring, and nesting; then kittens arrive quickly, usually 10 to 60 minutes apart, some headfirst and some feetfirst, both normal. She should tear the sacs and clean each kitten herself. Call the vet if she strains hard for 30 minutes with no kitten, if a kitten is visibly stuck halfway, or if an hour passes with a kitten on the way and no progress.
Tools for this stage: cat giving birth, step by step
6. Kitten Care and Weaning
Healthy kittens nurse and sleep in a pile and gain roughly 10 grams a day: weigh the litter daily for the first two weeks. Eyes open around 7 to 10 days, weaning starts with mush at 4 weeks, and kittens are fully on kitten food by 8 weeks. Keep the queen on kitten food the whole time she is nursing, and start vaccines with your vet at 6 to 8 weeks.
Tools for this stage: kitten growth calculator
Cat Breeding Month Chart
Mating month on the left, kittening month on the right, using the 65 day average (about two months and a week). Cats breed whenever they are in heat and indoor queens often cycle year round, so every row works: the note column flags what that kittening date means for you.
| Breed in | Kittens arrive | Plan for |
|---|---|---|
| January | March | Spring queening: mild days, easiest season for kittens |
| February | April | Spring queening: mild days, easiest season for kittens |
| March | May | Spring queening: mild days, easiest season for kittens |
| April | June | Summer queening: shade and a cool nesting spot, kittens dehydrate fast |
| May | July | Summer queening: shade and a cool nesting spot, kittens dehydrate fast |
| June | August | Summer queening: shade and a cool nesting spot, kittens dehydrate fast |
| July | September | Fall queening: comfortable weather, plan warmth by weaning |
| August | October | Fall queening: comfortable weather, plan warmth by weaning |
| September | November | Fall queening: comfortable weather, plan warmth by weaning |
| October | December | Winter queening: warm, draft-free nest with a heat pad |
| November | January | Winter queening: warm, draft-free nest with a heat pad |
| December | February | Winter queening: warm, draft-free nest with a heat pad |
Turn your own mating date into an exact queening date with the cat gestation calculator.
Frequently Asked Questions
Do cats have to mate to ovulate?
Yes. Queens are induced ovulators: the stimulation of breeding triggers the release of eggs about 24 to 48 hours later, rather than ovulation arriving on a fixed cycle day. That is why several matings over two or three days beat a single pairing, and why one escaped indoor queen can come home pregnant.
At what age can a cat first be bred?
Queens reach puberty young, often at 4 to 6 months, but breeding a kitten is hard on her growth and on the litter. Wait until she is fully grown and mature, at least 10 to 12 months and ideally past her first season, with a clean vet check and vaccinations current. Toms are fertile by 6 to 8 months but also deserve maturity and disease testing first.
How often do cats come in heat?
During the breeding season, every 2 to 3 weeks: each heat lasts 3 to 7 days and a new one follows if she is not bred. Outdoor cats cycle from spring through fall, while indoor cats under artificial light may cycle all year. The constant cycling is draining, which is one more reason pet queens outside a breeding program are usually spayed.
How many kittens are in a first litter?
First litters average 2 to 4 kittens, smaller than the 4 to 6 a mature queen typically carries. Breed matters (Siamese often run larger litters, Persians smaller), as do the queen's age and condition and how well the mating days lined up with ovulation. An X-ray in the final week counts skulls and spines so you know exactly when queening is finished.
Should I spay a cat I am not breeding?
Almost always yes. Spaying before the first heat nearly eliminates the risk of mammary tumors and removes the pyometra, roaming, and constant-cycling costs of repeated heats. A queen can be spayed once her kittens are weaned and her weight and condition are back, around 8 weeks after queening. Even breeding queens are spayed after their final planned litter rather than cycled forever.
Record It All on Paper
Matings, due dates, and daily litter weights are worth more than memory. Our printable breeding record sheets and kit checklists print free, no signup.
Kanika
Researched and reviewed by Kanika, founder of GestationCalc. All gestation data is verified against primary veterinary and agricultural sources before publication.
Last reviewed: September 26, 2026