Mouse Gestation Period

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How do you feel about mice? While mice may seem small, cute, and overly harmless, they can actually wreak a fair amount of damage through your home! They’re sneaky little fellows, seeking out the warmth and food that your home provides. After they sneak in, they multiply quickly, infesting your home with babies that grow into adult mice all too quickly.

Mice don’t quit after they’ve damaged your appliances, furniture, and surfaces—they seek out your food, hoping to devour you of house and home. Mice are the great unwanted roommates, the furry little thieves that stay long past their welcome and don’t return the things they’ve used. They’re contaminants, and can bring diseases into your home that might make you and your family members sick. They can infect you with lice and other illnesses, and make your tidy home an unsafe and unclean space. Mice can infest your house fast, and it’s best to have professionals tackle the problem as soon as it’s noticed.

How Long Does a Mouse Gestation Period Last?

Female mice become sexually mature at 6 weeks, and can reproduce from that point on. Their extremely quick process of maturation means that mice are intensely capable breeders. When mice live indoors, this only increases, and they can breed throughout the year. Mice only breed outdoors in the spring, summer, and fall, the winter typically too harsh for any breeding.

The life of a mouse increases dramatically when they find comfort in your home. The average lifespan of a mouse outdoors is 12 months, but indoors that lifespan can easily double or triple. Indoors, mice aren’t exposed to harsh environmental factors or predators, and they can freely eat through your valuables, breed, and spread disease.

House Mouse Gestation Period

The average gestation period for a house mouse is between 19 and 21 days, and the female mice give birth to a litter of young that’s between 3 and 14 mice, with an average of 7. A single female can have upward of 10 litters a year, dramatically increasing the population of mice. Mice can reproduce all year long, though they usually take a break in the winter or during any harsh weather or circumstances. This is especially true for outdoor mice.

While mice pups are born without fur or ears, they develop by their fourth day of life, and fur grows before the end of the first week. At the second week their eyes open, they’re weaned by the third week, and they’re sexually mature by the sixth week. This extremely short gestation period means that copulating mice is quite troublesome and should be dealt with quickly.

Deer Mouse Gestation Period

The breeding season for deer mice activates between March and October, and the average female deer mouse has between 2 and 4 litters. Their total gestation period is between 21 and 37 days, and the average deer mouse female gives birth to between 3 and 11 young (an average of 6). Newborns are naked and blind, though their eyes open in the second week and they can be weaned to traverse home ranges as soon as the third week. Deer mice are sexually mature at between one and two months, with the typical female producing a litter by their first summer. While deer mice have a high mortality rate, adults can live for over a year, with some living well beyond that based on their circumstances and food source.

Wood Mouse Gestation Period

The typical wood mouse mating period begins in March and continues through the fall and winter, depending on the mildness of the season. Their gestation period is about 4 weeks in total, and the average female births between 4 to 7 blind and naked young. The female can produce upward of 4 litters per year, though the true average is about three. They give birth in a crafted nest chamber of their burrow, and the young open their eyes at 6 days and have a full coat then as well. At 3 weeks, the young leave the nest and seek out food. The average wood mouse only lives for a few months, and their population varies with the season, swelling the most in the fall.

Harvest Mouse Gestation Period

The average gestation period for a harvest mouse lasts about two weeks, and the offspring of a female harvest mouse is between 1 and 7 total mice. Females wean their offspring in the second week, and their young mice become independent and leave the nest sometime in week 5. The males and females both reach sexual maturity at about 3 months, though the young can learn to climb as early as 12 days. Harvest mice seek out a variety of food sources as soon as they can.

Once the Mouse Gestation Period Has Ended, How Long Does It Take for Them to Reproduce Again?

The average female mouse can breed within a single day of giving birth. This makes them able to produce astounding numbers of litters during a breeding period, especially during the warm months when they have a lot of food and shelter.

At Which Age a Female Mouse Reaches Sexual Maturity

The average female mouse can reach sexual fertility at around 8 weeks. They can give birth to a litter every 25 days, and will continue to do so until they become too old or they die. The female takes care of her litter for about 4 weeks, whereupon she searches for additional food and encourages them to leave the nest, climb, and search for food themselves.


The gestation period for the average mouse varies slightly across the board, but female mice are hearty and give birth far too many times during the year for comfort. If you have a mice infestation on your hands, it’s best to get it taken care of as soon as possible. Call the professionals, such as Hama Pest Control, to take care of your infestation problem and keep the mice from breeding out of control. The sooner you notice evidence of a mice infestation, the better—especially if it’s at the beginning of the warm season!

Jake Garza
Jake Garza
Jake is the founder of Hama Pest Control, the preferred choice for pest removal and extermination in the Greater Toronto Area. With over thirty years of experience, Jake prides himself in bringing quality, knowledge, and care to Hama Pest Control's customers.
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