Maine Coon cats reach their full size and maturity at around 1-2 years of age but can continue to grow until they’re between 3-5 years old. This makes them one of the longest-developing cat breeds, with a kitten stage that lasts upwards of 2 or more years!
During this time, Maine Coons will experience rapid growth spurts, eventually reaching heights of up to 12 inches and weighing anywhere from 10 to 25 lb. On average, it’s expected for the Maine Coon’s growth period to end by around the 3rd year of life. As such, most Maine Coons are no longer considered kittens after three years old.

However, some may take slightly longer than others, depending on their rate of development. By this point in time, you should be able to identify an adult Maine Coon when compared side by side against other cats – they’ll boast long body types and large frames as well as thick coats comprised of shaggy fur!
So if your buddy is over three years old and still looking like a kitten, then it’s probably because they are enjoying an extra-long developmental stage – which means extra fluffiness for you.
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When Do Maine Coon Cats Stop Growing?
Maine coon cats are one of the giant domesticated cat breeds. They are known for their large size, intelligence, and playful disposition. So, when do these big cats stop growing?
On average, Maine coons will reach a total size between three and five years old. However, some may continue to grow and fill out until they are six or seven years old. Once they reach full size, they usually weigh between 12 and 18 pounds.
So, if you’re thinking about adopting a Maine coon cat, be prepared for a lot of love…and a lot of hair! These cats can be very cuddly and devoted, so it’s worth the wait to have a full-grown companion in your life.
It’s important to remember that all cats are different; some may reach their full size earlier or later than others. So if you’re looking for a Maine coon cat, talk to the breeder or adoption agency about the size and growth potential of the cat you’re interested in. That way, you’ll know what to expect when it comes to your new furry friend’s growth.
How to tell if a Maine coon cat has reached maturity
Maine coon cats are the largest of all domesticated breeds, and due to their size and physical attributes, it can take up to 4-5 years to reach maturity. As they grow, Maine coon cats display several bodily changes that signify growth and maturity.
To quickly tell if your Maine coon cat has reached its full maturity, check the size and shape of its head. Young Maine coon cats typically have narrower heads that are longer in form than their fully-grown counterparts. The bridge of the nose is also less pronounced when they are younger compared to mature cats.
In terms of physical size, you can expect your Maine coon cat to reach its full-grown size by the time it is four years old. Male cats typically weigh between 15-25 pounds, while females usually weigh 10-20 pounds. So, if your cat falls within this weight range and has a broader head with a more pronounced nose bridge, it is most likely fully matured.
Additionally, Maine coon cats tend to have longer fur when they hit maturity. So if you notice that your cat’s coat has grown lush and thicker, it indicates their age.
Finally, another way to tell if your Maine coon cat has reached its full maturity is by observing its behavior. Mature cats tend to be more social and playful than younger cats, so if your cat exhibits a calmer, more confident demeanor, it most likely has reached its full maturity.
How long does it take for a Maine Coon to mature fully?
Maine Coons are a beloved breed of domestic cat, renowned for their intelligence and large size. As such, it’s not surprising that many people are curious to know how long it takes for a Maine Coon to mature fully. The answer is somewhat complicated, as the rate of growth and development depends on several factors.
The first factor is heredity. If a Maine Coon’s parents or grandparents were large cats, they would likely stay that way as adults. However, even with proper nutrition and care, some individuals may remain smaller than their counterparts due to genetics.
The second factor is the age at which a Maine Coon is adopted. Kittens reach full maturity faster than adult cats, usually around two. However, if a Maine Coon is adopted at an older age, it may take up to five years to reach full size and maturity.
Finally, the diet and nutritional intake of a Maine Coon will also play a role in its growth rate. A balanced diet, full of the essential vitamins and minerals needed for healthy growth, is critical to helping a Maine Coon reach its full potential.
What to do if my Maine Coon is no longer a kitten?
Once your Maine Coon is no longer a kitten, there are a few steps you should take to ensure it remains healthy and happy.
First, ensure that the cat gets the proper nutrition from its diet. Kittens have different nutritional needs than adult cats; when your cat reaches adulthood, it’s essential to switch its diet from kitten food to adult cat food. Be sure to consult your veterinarian for the best type of food and portions for your Maine Coon.
Second, ensure that your Maine Coon is getting plenty of exercise. This breed tends to be more active than other cats, so providing ample space to run and play is essential. A few toys scattered throughout the house can help keep your cat entertained and active.
Third, make sure that your Maine Coon is getting the proper grooming. Its coat must be brushed twice a week as an adult to prevent matting and shedding. You should also check its ears regularly for any signs of infection and trim its nails as needed.
Finally, be sure to keep up with regular veterinary visits. Your Maine Coon should get a complete exam twice a year to monitor its health and catch any potential problems early on.
Following these steps, you can ensure that your Maine Coon remains healthy and happy as it grows from a kitten into an adult.