How long mice live depends more on where they live than on the mouse itself: about a year on average, often only a few months outdoors, and longer in a warm house with steady food. That short life tempts some homeowners to wait an infestation out.
Waiting rarely works. Young mice can start breeding within weeks of birth, so the mice in a wall are often replaced faster than they die of old age. Even the one-year average hides a wide gap between a mouse dodging owls in a field and one living behind your stove.
How Long Do Mice Live on Average?
Mice live about one year on average, and most wild mice die before that. The exact number depends less on the mouse than on where it lives: a mouse with steady food, warmth and no predators can live several times longer than one fighting to survive outdoors.
How Long Do Mice Live in the Wild?
Mice in the wild usually live less than a year. The Government of Alberta puts the lifespan of wild mice at 4 to 12 months, depending on the species and conditions. UC IPM (University of California) gives a typical 9 to 12 months for house mice, and Animal Diversity Web, a University of Michigan database, says most wild mice do not live beyond about 12 to 18 months. Predators and harsh weather are likely the main reasons the number is so low.
How Long Do Mice Live in a House?
Mice in a house live longer than mice outdoors, because a home gives them shelter, food and protection from most predators. UC IPM puts the usual house mouse lifespan at 9 to 12 months but notes that some have lived up to 3 years. Pest control companies such as Orkin report an average of about two years for mice living indoors. In other words, a mouse that settles in your walls this fall can still be there in two winters if nothing removes it.
How Long Do Pet Mice Live?
Pet mice live about 2 years on average, according to Animal Diversity Web. Exceptional captive mice, including calorie-restricted and specially bred animals, have reportedly lived 5 to 6 years, but that is far outside the normal range for a pet.
How Long Do Laboratory Mice Live?
Laboratory mice hold the longevity records. The Methuselah Mouse Prize, a competition to breed or engineer very long-lived lab mice, reportedly recorded a genetically engineered mouse that lived just under 5 years. Another lab mouse, kept in an enriched environment without any treatment, reportedly lived more than 4 years. Records like these show how much of a mouse's short life comes from its surroundings rather than its biology.
What Is the Mouse Lifespan by Species in Canada?
Mouse lifespan depends on the species, and two of the mice Canadians meet most often are the house mouse and the deer mouse, according to the Government of Alberta. Our mice hub covers both in detail. If you are not sure which one you have, our mouse identification chart shows the differences.
House Mouse Lifespan
The house mouse (Mus musculus) lives for about 1 year, according to MyHealth Alberta. UC IPM gives a usual house mouse lifespan of 9 to 12 months, with some individuals living up to 3 years. The house mice in your home tend to outlive their wild relatives, since indoors they can stay active and breed all year (Government of Alberta).
Deer Mouse Lifespan
The deer mouse (Peromyscus maniculatus) usually lives less than a year in the wild, but it may live up to about 8 years in captivity, according to Animal Diversity Web. It is found across most of Canada, up to the northern tree line, and is usually brown or grey with a white belly and white feet (Health Canada). It matters more than its lifespan suggests: Health Canada calls the deer mouse the most common carrier of hantavirus, so treat any deer mouse, living or dead, with care.
White-Footed Mouse Lifespan
Many white-footed mice (Peromyscus leucopus) live for about one year in the wild, and captive white-footed mice may live up to about 3 years (Animal Diversity Web). In Canada, this close relative of the deer mouse is generally found from Nova Scotia west to Saskatchewan.
Field Mouse (Meadow Vole) Lifespan
The "field mouse" many Canadians see in lawns and gardens is often a meadow vole (Microtus pennsylvanicus), which is a vole rather than a true mouse. Meadow voles have the shortest lives on this list: usually about 2 to 3 months in the wild, though some may live longer. In captivity, they can live more than 2 years (Animal Diversity Web).
What Limits a Mouse's Lifespan?
A mouse's lifespan is often limited by predators, food supply, cold and disease, which may be why the same species can live far longer in a cage than in a field. Here is what shortens the mouse lifespan outdoors and what changes once mice move inside.
Predators
Predators kill most wild mice. Animal Diversity Web lists domestic cats, red foxes, weasels, snakes, hawks, falcons and owls among house mouse predators, and mice tend to survive by staying out of the open and moving fast. Rats are also a threat: they can kill and eat mice, which may be one reason mice and rats rarely live in the same spot.
Food Supply
Food supply sets the pace of a mouse's life. According to UC IPM, house mice can eat up to 20% of their body weight every day, spread over many small meals a night. They do not need to drink water to survive, but they will look for liquids. A mouse cut off from food weakens quickly, as our guide on how long mice can live without food explains, while a mouse in a pantry or a garage full of birdseed has everything it needs.
Do Mice Die in Winter?
Mice do not die off in winter, and they do not hibernate. The Government of Alberta notes that mice can stay active all year, and MyHealth Alberta explains that they often move indoors in autumn and winter to find food and cover. So Canadian cold does not thin out the mice around your home: it pushes them into it. Read more about mice in winter.
Disease
Disease and injury also limit how long wild mice live, along with shortages of food and water. Wild mice face many pathogens, and the first weeks are the riskiest: Skedaddle Wildlife Control, a Canadian company, reports that many mice born in natural settings do not survive their first month.
Pest Control
Pest control is the main thing that shortens a mouse's life indoors. Once mice are inside a home with food and shelter, Orkin notes that the main threats left to them are disease, people and pets. Without traps, sealing or professional help, indoor mice simply live out their full lifespan and keep breeding.
Why Does a Short Mouse Lifespan Not End an Infestation?
A short mouse lifespan does not end an infestation, because mice reproduce much faster than they die. Each mouse may only live about a year, but the colony keeps replacing itself.
How Many Babies Can a Mouse Have in Its Lifetime?
A female house mouse typically has 6 to 10 litters in her lifetime, with about 6 babies per litter, according to MyHealth Alberta. That works out to roughly 36 to 60 babies from a single female. UC IPM adds that a female may have up to 10 litters in a single year when food and shelter are steady, and the Government of Alberta notes that house mice living indoors can breed year round.
How Fast Young Mice Start Breeding
Young mice start breeding within weeks. House mice are usually sexually mature about 5 to 6 weeks after birth (UC IPM), or 5 to 7 weeks according to the Government of Alberta, and pregnancy typically lasts only 18 to 21 days. When conditions are good, a female can have a new litter about every 3 to 4 weeks. For the details, see how often mice reproduce and the full mouse life cycle.
Do Mice Go Away on Their Own?
Mice rarely go away on their own once they have food and shelter in your home. Old mice die, but their offspring take their place and start breeding within weeks. Health Canada advises dealing with occasional mice right away to avoid a severe infestation.
What Should You Do If Mice Are Living in Your Home?
Mice living in your home should be removed now rather than waited out, because the group replaces itself faster than old mice die. These steps work together.
Trapping
Trapping is the most direct way to remove mice. MyHealth Alberta says snap traps work well and cause an instant death, and the Government of Alberta recommends placing traps along walls and travel routes, about 1.8 m apart. Follow our complete plan to get rid of mice for trap types and placement.
Sealing Entry Points
Sealing entry points keeps new mice from replacing the ones you remove. A house mouse can squeeze through a crack as small as about 1 cm, smaller than a dime (MyHealth Alberta). The Government of Alberta advises sealing all openings larger than about 6 mm with gnaw-resistant materials such as metal or concrete.
Safe Cleanup
Safe cleanup matters because dead mice, droppings and nests can carry germs, and deer mice can carry hantavirus. The Government of Alberta recommends opening doors and windows and staying out of the area for at least 30 minutes. Then soak droppings, nests and dead mice with 1 part bleach to 9 parts water (or a household disinfectant) for 10 minutes before you pick them up with gloves, as the Public Health Agency of Canada advises. Never sweep or vacuum them, because that can put germs into the air. See how to clean mouse droppings for the full method.
When to Call a Pest Control Professional
A pest control professional makes sense when the problem is large or keeps coming back. MyHealth Alberta advises hiring a certified pest control professional when the problem is bad. If you use poison baits yourself, use tamper-proof bait stations, never place bait where children or pets can reach it (Government of British Columbia), follow the label and check for a PCP number, and leave commercial-class products to certified professionals. If you decide to hire help, you can get a quote from a recommended local exterminator through Pest Agent's referral form.
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Get a free quoteFrequently asked questions
Can a mouse live for 5 years?
Almost never. Wild mice usually live less than a year and pet mice about 2 years. The longest-lived mice on record are laboratory animals, including a genetically engineered mouse that reportedly lived just under 5 years.
Do deer mice live longer than house mice?
Not in the wild, where both usually live about a year or less. In captivity, deer mice can live much longer, reportedly up to 8 years, which suggests that predators and weather, not age, end most wild mouse lives.
Do mice die of old age in your house?
Some can, because a house removes most of the predators and food shortages that kill wild mice. A few house mice have reportedly lived up to 3 years (UC IPM), and they can breed for most of their lives, so old age does not usually shrink the population.
How long does a mouse infestation last?
An infestation lasts until something breaks the cycle. The group keeps replacing itself as long as it has food, shelter and a way in, since each female can typically have 6 to 10 litters in her lifetime and young mice may breed within weeks.
Are dead mice dangerous to touch?
They can be. NC State Extension notes that mice can carry many germs, and deer mice are often described as the most common carrier of hantavirus in Canada. Ventilate the area, soak the mouse with a bleach solution (UC IPM), wear gloves, and never sweep or vacuum droppings or nests.
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