Where Do Mice Hide in a House? Spots to Check Room by Room

TL;DR

• Mice hide wherever they find shelter close to food and heat: wall voids, ceilings, storage areas, cabinets, appliances, insulation and furniture.
• Inside walls is likely the most common hiding place. The usual clue is scampering and scratching in the walls at night.
• In the kitchen, check the hollow base of the cabinets, behind the stove and fridge, and under the sink.
• Also check around the furnace and water heater, attic insulation, and stored boxes, closets and drawers that rarely move.
• Look for the nest where droppings are most concentrated: it is often within a few metres of that spot.
• Need help? Get a quote from a recommended local exterminator through Pest Agent's referral form.

Mice hide in a house in the spaces you rarely look at: wall voids, the gap under the bottom cabinets, the warm floor behind the fridge, the box of old clothes nobody has opened since last winter. The common mistake is to search where the mouse was spotted, out in the open, when it was only passing through on its way back to cover.

Droppings make a better clue. A house mouse keeps its nest within a short run of its food, so the corner where the evidence piles up is usually a few steps from where it sleeps. Heat counts as much as food, which is why the furnace room and the back of the fridge rank among a mouse's first choices.

Why Do Mice Hide Where They Do?

Mice hide in a house wherever they find shelter close to food and heat. According to the Government of Alberta, mice often build their nests in sheltered areas close to food and heat sources, and tend to stay within a small range around them. Once you understand these needs, you can predict where mice are hiding in your own home. In Canada, the two mice you are most likely to find indoors are the house mouse and the deer mouse (Health Canada). If you are not sure which one you have, see the mice hub for identification guides.

Warmth

Warmth is the first thing mice look for, especially once Canadian nights turn cold. The University of Nebraska-Lincoln notes that appliances that run constantly, such as refrigerators, water heaters and furnaces, can be favourite den sites, and that nests are often found near heat sources like ovens. Insulated wall voids close to a heat source are another common choice.

Food Nearby

Food nearby keeps mice from travelling far. The Government of Alberta says mice stay within a range of approximately 3 to 10 m (about 10 to 30 feet), and UC IPM adds that house mice seldom venture more than 30 feet (about 9 metres) from their nest and food supply. In practice, if you find droppings in your pantry, the hiding spot is probably within a few metres of it: in the wall behind, under the bottom cabinet or behind the nearest appliance.

Low Disturbance

Low disturbance matters as much as warmth. Mice prefer dark, secluded spots where they are unlikely to be bothered, and they are mainly active at night, with activity often peaking at dusk and shortly before dawn (Government of Alberta). That is why storage areas, unused rooms and the inside of furniture make good hideouts. If you are curious about what mice do while you are awake, read our guide on where mice hide during the day.

Fall Arrival

Fall is when most mice move into Canadian homes. UC IPM reports that outdoor house mice frequently enter homes in autumn when nighttime temperatures drop, and Alberta Health Services says house mice usually come in during the fall and winter looking for food and shelter. Deer mice may also invade buildings near fields and woodlands in the fall (Health Canada). To understand how they get in, see how mice get into your house.

Where Do Mice Hide in a House?

Mice hide in a house mostly inside the structure itself and in quiet corners near food. The Government of Alberta lists wall voids, ceilings, storage areas, cabinets, appliances, insulation and furniture as common indoor nesting spots. Here is where to look, room by room.

Inside Walls

Inside walls is the most common place mice hide in a house. Mice can climb up and down the framing inside wall voids and use the holes drilled for plumbing and electrical wiring to move from the basement to the attic (Orkin Canada). Insulated walls near a heat source are a favourite. The usual clue is scampering and scratching in the walls at night, which Health Canada lists as a sign of rodents.

Ceilings

Ceilings hide mice the same way walls do. The Government of Alberta notes that mice can travel through walls, ceilings and service spaces, spreading between rooms and even between floors. Scratching or squeaking overhead, especially at night, often means mice are using the space between floors as a highway or a nest site.

Attics

Attics give mice warmth, quiet and plenty of nesting material. Attic insulation can serve as ready-made bedding (Orkin Canada), and Interior Health in British Columbia notes that deer mice tend to like attics. Check around stored boxes, along the edges where the roof meets the walls and in any insulation that looks flattened, tunnelled or shredded.

Kitchen Cabinets

Kitchen cabinets, and especially the hollow space at their base, are one of the top hiding spots because food is only a few steps away. Orkin lists the bases of kitchen cabinets among the places mice often build nests, and the Government of Alberta names cabinets as an indoor nest site. Look for droppings on shelves, along the back edge and in the gap under the bottom drawer.

Behind Kitchen Appliances

Behind kitchen appliances is where mice find both heat and crumbs. The University of Nebraska-Lincoln names refrigerators and ovens as possible nest sites near heat, and Alberta Health Services lists droppings under stoves and refrigerators as a sign of mice. Pull the stove and fridge out with a flashlight in hand: the gap behind them and the insulated spaces inside the appliance base are frequent hideouts.

Pantries

Pantries attract mice because they hold the most food in the house. Alberta Health Services points out holes chewed in boxes and bags of food as a sign (the Government of British Columbia also lists chewed food packages), and advises storing food in glass or metal containers because mice can chew through plastic. A pantry is more often a feeding spot than a nest, so the nest is usually close by in a wall or cabinet base.

Under the Sink

Under the sink is a common hideout because pipes create gaps into the wall and leaks provide moisture. Alberta Health Services lists droppings under sinks as a possible sign of mice. House mice do not need to drink water to survive, but they may look for liquids if their food is dry (UC IPM), so it helps to fix leaky taps, sweating pipes and open drains, as Health Canada suggests.

Basements

Basements offer dark corners, storage and, most of all, the furnace and water heater. Appliances that run constantly can be favourite den sites (University of Nebraska-Lincoln), so check around and behind the furnace, the water heater and any extra fridge or freezer, as well as stored boxes along the walls.

Crawl Spaces

Crawl spaces are quiet, rarely visited and often connected to the walls above. Orkin Canada suggests setting traps near traffic areas such as crawl spaces and attics. Look for droppings along the foundation walls and for nesting material tucked against the sill.

Garages

Garages give mice shelter, clutter and often pet food or birdseed. Health Canada advises removing cosy nesting sites in unused clutter around your house and garage, and UC IPM suggests searching garages for nests. Gaps under the garage door are a common way in.

Closets

Closets, especially those full of stored items that rarely move, are a quiet place to nest. Some pest control companies list closets among nest locations, along with boxes and stored items (Colonial Pest Control). Look on the floor at the back of the closet and inside bags and boxes stored there.

Drawers

Drawers that are seldom opened can hide a nest, which is why UC IPM suggests searching in drawers. Droppings in cupboards and drawers are often the first thing people notice (Skedaddle Wildlife Control). Check kitchen drawers, desk drawers and dresser drawers in spare rooms.

Upholstered Furniture

Upholstered furniture, such as a sofa or armchair that is rarely moved, can hide mice inside it. The Government of Alberta lists furniture among indoor nest sites, and Alberta Agriculture notes that house mice may live behind cabinets or furniture. The stuffing itself makes good nesting material. Tip the piece over and look under the dust cover for shredded material and droppings.

Storage Boxes

Storage boxes, especially cardboard ones that nobody opens, are prime nesting spots. The University of Nebraska-Lincoln notes that mice inhabit piles of debris, infrequently moved items and other inaccessible areas, and Orkin lists infrequently emptied storage boxes among common nest sites. Mice can also build runways under flat surfaces such as plywood or boards leaning against a wall (Alberta Agriculture).

Where Do Mice Nest in a House?

Mice nest in a house in the most sheltered spot near their food, usually inside a wall, a ceiling, a cabinet base, an appliance or a pile of stored items. The nest is where they sleep and raise their young, so finding it is the key to understanding how big the problem is.

What a Mouse Nest Looks Like

A mouse nest looks like a loose ball of shredded material. Alberta Agriculture describes it as usually ball-shaped, and Colonial Pest Control says a house mouse nest is usually about the size of a grapefruit. Sometimes it is just a flat platform of loose material rather than a closed ball.

Nesting Materials

Nesting materials can be whatever soft fibres mice can shred nearby: paper, cardboard, tissues, bits of clothing and fabric, insulation, carpet fibres and furniture stuffing (Orkin Canada, Colonial Pest Control). Shredded paper or fabric in a corner where it should not be is a strong clue that a nest is close.

Signs a Nest Is Nearby

Signs of a nest nearby include piles of droppings, a musky smell and fresh gnaw marks. The Government of Alberta notes that nest locations can often be identified by accumulations of droppings and a noticeable odour, and that mouse droppings are roughly 4 to 7 mm long. UC IPM adds that the musky odour is often noticed in large or long-term infestations. For the full list, read our guide to the signs of a mouse infestation.

Finding the Nest

Finding the nest starts where droppings are most concentrated: the nest is often within a few metres of that spot. Work outward along walls, since mice prefer to travel around the edge of a room (Alberta Health Services). For a step-by-step search method, follow our guide on how to find mice in your house. Do not pull a nest out with bare hands: see the safe cleanup steps below.

Where Do Mice Hide Outside Your House?

Mice hide outside your house in debris, vegetation and outbuildings close to your walls, and move indoors when nights turn cold. The Government of Alberta says mice outdoors may nest in debris piles, vegetation or shallow burrows. Removing these spots near the house means fewer mice ready to slip inside in the fall.

Woodpiles

Woodpiles stacked against the house are an ideal outdoor hideout, with shelter and a short trip to your walls. UC IPM suggests searching around woodpiles for nests, and the Public Health Agency of Canada advises moving stacked woodpiles and compost bins away from buildings.

Sheds

Sheds, cottages and other outbuildings that sit closed for months are some of the places mice like best. The Public Health Agency of Canada says you may have a higher risk of hantavirus infection if you are exposed to rodent habitats in and around garden and storage sheds. Take extra care when opening them in spring.

Overgrown Vegetation

Overgrown vegetation, long grass and debris along the foundation give mice cover right next to your home. Orkin lists rock piles, piles of debris and tree cavities among outdoor hiding places. The Government of Alberta recommends maintaining landscaping by mowing grass and removing debris.

How Do You Get Mice Out of Their Hiding Spots?

Getting mice out of their hiding spots means trapping along the routes between the nest and food, then removing the shelter and sealing the way in. Doing only one of these steps rarely works for long. Our full guide on how to get rid of mice covers every method in detail.

Trap Placement

Trap placement should follow the routes mice use between their hiding spot and food. The Government of Alberta advises placing traps along walls and known travel routes and spacing them approximately 1.8 m (about 6 feet) apart, and Alberta Health Services suggests corners and across the paths mice use. Health Canada says snap traps and electronic traps are easy to use and very effective if they are well positioned and set properly. Learn how to set a mouse trap and compare options in our best mouse trap roundup. If you use poison baits, Health Canada says they should never be the only method, and they must go in tamper-proof bait stations wherever children or pets could reach them.

Remove Clutter

Removing clutter takes away the hiding spots themselves. Health Canada and the Government of Alberta both recommend removing clutter and nesting materials. Store items in sealed plastic bins rather than cardboard boxes, keep things off the floor where you can, and move boxes stacked against walls so you can see behind them.

Store Food Safely

Storing food safely removes the reason mice settle near your kitchen. Health Canada recommends keeping dry food and dry pet food in metal or glass containers, and the Government of Alberta advises cleaning up spills and crumbs promptly and securing garbage.

Seal Entry Points

Sealing entry points stops new mice from moving into the spots you just cleared. Health Canada notes that mice can squeeze through a gap as small as a dime, and the Government of Alberta recommends sealing openings larger than 6 mm (about 1/4 inch) with gnaw-resistant materials such as metal or concrete. The Public Health Agency of Canada suggests wire screening, steel wool, metal flashing or cement. Seal after you have trapped the mice already inside, so you do not lock them in.

Clean Nests Safely

Cleaning nests safely protects you from diseases carried in droppings and urine, including hantavirus, which Health Canada links mainly to deer mice. Follow these steps from Canadian health authorities:

1. Open windows and doors for 30 minutes to air out the area before you start (Alberta Health Services).
2. Wear rubber or plastic gloves, as the US CDC advises, and a well-fitting filter mask.
3. Do not sweep or vacuum droppings or nesting material, because this can send germs into the air.
4. Soak the nest and droppings with a mix of 1 part bleach to 9 parts water and let it sit for 10 minutes (Public Health Agency of Canada).
5. Wipe it up with paper towels, seal everything in a plastic bag and throw it out, then wash your hands.

For more detail, read our guide on how to clean mouse droppings.

When to Call a Pest Control Professional

Calling a pest control professional makes sense when mice are nesting inside walls or ceilings you cannot reach, when you find signs in several rooms, or when you keep seeing mice during the day. The Government of Alberta notes that repeated daytime sightings can indicate a larger or well-established infestation. A licensed pest control professional can inspect the hiding spots you cannot reach, trap or bait safely and seal the entry points. You can get a quote from a recommended local exterminator through Pest Agent's referral form.