When Do Ferrets Reach Full Size5 min read

Ferrets are a domesticated animal that is cousins to the weasel family. Ferrets have a rapid growth rate, reaching full size in just a few months. Ferrets mature from weaning to sexual maturity in about 3-4 months.

As mentioned above they reach their full size in appx. 4 months. Male ferrets (hobs – intact male) are considerably heavier than females (jills – intact female).

How Big Do Ferrets typically get?

Knowing how big your ferret will be when he reaches maturity can help you make better decisions about the type of home you’ll need to provide for him and whether or not he’ll fit in it.

It can also help you determine when it’s time to stop adding to his cage since you’ll know just how much more room you’ll need…

Average length of a ferret (from tail to nose)

  • Male ferrets – appx. 16″
  • Female Ferrets – appx. 12″

Average weigth of a ferret

  • Average weight male ferret – 2.5 pounds
  • Average weight female ferrets – 1.5 pounds

During its lifespan, a hob can reach up to appx. 5.5 pounds, a jill appx. 2.5 pounds

When Will My Ferret Stop Growing

With the age of appx. four-month your ferret will stop growing. Although you still will notice changes in its appearance. The face/head will develop a more “adult” look.

Ferrets Reach 90% of Their Adult Size in How Many Weeks?

The size of the ferret greatly depends on the diet of the ferret.

Many new ferret owners are surprised to learn that their fuzzy friends will not grow much anymore after a few months.

In fact, by three months old, a ferret will reach 90% of its adult size. Of course, their skeleton is not yet fully mature.

At about the same time, the ferret will begin to look a bit more like an adult.

This is when it may start looking a bit less like a ball of fluff and more like the furred weasel it is.

When Do Ferrets Become Adults

It takes ferrets approximately four month to reach adulthood.

Birth to Weaning

Ferrets are usually ready to move to their own cage between 4 and 8 weeks of age, but as always: that’s largely depending on the ferret.

Some ferrets are grown enough to leave their mother much quicker than others, while older kits might need to remain with mom until they are closer to 6 weeks.

When you choose to relocate your ferret, it is an important decision requiring thorough consideration.

Weaning to Adulthood

It does not take long for ferrets to reach adulthood once they´re weaning. The timespan approximately takes only two months (read.. different kinds of ferrets).

Sexual Maturity

Some ferrets reach sexual maturity at around two to four months old, but others may take as long as five to six months or longer to reach adulthood.  

How old a ferret is when it reaches sexual maturity is mostly dependent on genetics and how big the ferret is.  

A large ferret is likely to go through puberty a lot later than a small ferret, especially a small ferret of the same breed.  There is also a genetic component to how fast a ferret reaches maturity.  

A ferret that is genetically predisposed to grow faster will likely reach sexual maturity sooner than a genetically slower ferret.


One of the most common ferret myths is that they only live a few years. Ferrets live longer than you may think. They can live up to 10 years.

How Big Are Baby Ferrets When Born

Ferrets are amazing animals that can make your life a lot more interesting. They can be a lot of fun, but they can also be a handful.  

A kit usually weighs between 6 and 14 grams and is about the size of a 2 to 2.5″

If you plan to get a ferret, you need to start thinking about what you need to do in advance. To make your life easier, you should start making preparations as soon as you know you will be taking a pet into your household.  

While planning can help you prepare for when your ferret comes home, there is a lot to consider

The proper name for a baby ferret is kit (read.. what is a group of ferrets called). All ferrets start life the same size. Newborn ferret kits are only 2 or 2.5 inches long.

How Big Is An 8 Week Old Ferret

Depending on diet and genetics, ferrets can differ considerably in size. Even in the same litter.

Ferrets grow quickly, and they continue to grow throughout their life. Ferrets are inquisitive, active, and playful animals, and it can be a good idea to keep track of your ferret’s growth, especially if you’re looking to buy a new cage for your pet.

When does a ferret lose its baby teeth?

Baby ferrets (kits) will start losing their milk teeth around the age of appx. 8 weeks.

And yes, you should brush your ferrets’ teeth!

How Much Should a 1 Year Old Ferret Weigh?

The answer is, it depends on the size of the parents. In general, baby ferrets are born weighing less than three ounces. A typical ferret litter ranges from 3-12 baby ferrets, and even within a litter, weight and sizes may vary.

A ferrets’ growth is greatly affected by genetics. Ferrets are small mammals and can weigh anything between 2.5 to 6.5 pounds in adulthood. A female ferret is usually smaller than a male.

A ferret that is 10-12 months of age should weigh between 1.5 to 2.5 lbs, with a maximum weight of 4 lbs reported.

Leave a Comment