What Attracts Mice to Your House and What Keeps Them Away

What Attracts Mice to Your House?

Mice are attracted to your house by three things: food, shelter and a safe place to nest. According to the BC SPCA, rodents are often drawn to places with plenty of food and shelter, and they tend to keep coming back as long as both are available. Remove one or both, and your home becomes far less interesting to them.

Food Close to Shelter

Food close to shelter is what makes a home ideal for a mouse. House mice tend to prefer seeds and grain, but foods high in fat, protein or sugar, such as bacon, chocolate, butter and nuts, can be even more tempting (Prevention and Control of Wildlife Damage, University of California). A mouse usually stays within a small area, so a pantry or pet bowl a few steps from a quiet wall void is often exactly what it is looking for. For the full menu, see our guide to what mice eat.

Shelter From the Cold

Shelter from the cold is the main reason mice move indoors in Canada. The onset of cold weather each fall pushes mice into buildings in search of shelter and food (Prevention and Control of Wildlife Damage). Wall voids, attics, basements, crawl spaces and the space behind appliances can give them warmth and protection. This is why many Canadians first notice mice in the fall, and why activity can continue all winter once they are settled.

A Place to Raise Young

A place to raise young is the other half of shelter. UC IPM notes that if mice have few places to hide, rest, build nests or rear their young, they are unlikely to survive in large numbers. A female house mouse can have 5 to 10 litters a year, so a home that offers safe nesting spots can go from one mouse to a real problem in a single season.

Water

Water is a minor attractant for mice. House mice can survive with little or no free water because they can get moisture from their food, although they usually drink readily when water is available (Prevention and Control of Wildlife Damage, UC IPM). A leaky pipe will not draw mice on its own, but it makes a home even more comfortable once they are in.

Why Clean Homes Still Get Mice

Clean homes still get mice because shelter matters as much as food. According to the University of California wildlife damage manual, even the best sanitation will not eliminate house mice, and many buildings where food is stored, prepared or eaten may support at least a few. Cleaning still matters: it keeps numbers low and makes traps work better, because the bait has less competition. But a tidy kitchen has to be paired with sealing the gaps mice use to get in.

What Attracts Mice Inside Your Home?

Inside your home, mice are attracted to easy food and quiet, cluttered spots where they can nest. Kitchens, pantries, basements and garages are where most of these attractants are found.

Crumbs and Spills

Crumbs and spills are the easiest meal in the house. Mice often nibble small amounts at a time, so crumbs under the toaster, food left on the counter overnight and dirty dishes in the sink can be enough to keep one fed. Wipe counters and sweep the kitchen floor before bed.

Pantry Food

Pantry food in paper and cardboard packaging is a prime target. HealthLinkBC lists chewed cereal boxes and fruit left on the counter among the signs that rodents may have been eating household food. Mice can often chew through bags of cereal, flour, rice, crackers, nuts and seeds.

Pet Food

Pet food is one of the most common reasons mice settle in a home. UC IPM recommends feeding pets only the amount they will eat at one feeding, and HealthLinkBC advises removing pet food after feeding and not leaving it outside overnight. Bags of dry kibble stored on the floor of a garage or laundry room are just as tempting.

Garbage Bins

Garbage bins without a tight lid give mice a steady food supply. Health Canada, HealthLinkBC and the Public Health Agency of Canada generally recommend garbage containers with tight-fitting lids, indoors and outdoors.

Nesting Materials

Nesting materials draw mice as much as food does. Mice often build ball-shaped nests from shredded paper, burlap and other soft, fibrous materials (Prevention and Control of Wildlife Damage). Cardboard boxes, stacks of newspaper, tissues, fabric scraps and stored linens all qualify. Mice also shred insulation inside walls and attics and can chew electrical wiring, which can cause short circuits and fire hazards.

Clutter

Clutter gives mice hiding spots close to food. Health Canada advises removing cosy nesting sites in unused clutter around your house and garage, and UC IPM suggests looking for nests, often behind boxes, in drawers, in garages and around woodpiles. Storing items in sealed plastic bins off the floor, rather than in open cardboard boxes, can remove many hiding places at once. If you already suspect a nest, our guide on where mice hide in a house shows where to look.

Leaks

Leaks add the last comfort mice need. Health Canada names leaky taps, sweating pipes and open drains as possible water sources for rodents. Fix drips under sinks and around laundry machines, and keep basements as dry as you can.

What Attracts Mice Around the Outside of Your House?

Around the outside of your house, mice are attracted to spilled bird seed, compost, fallen fruit, woodpiles and plants growing against the walls. These outdoor attractants bring mice close to your foundation, where it is a short trip to the gaps that lead inside.

Bird Feeders

Bird feeders are a classic mouse magnet because seed is their favourite food. HealthLinkBC suggests equipping feeders with trays and cleaning up spilled seed often, and the BC SPCA advises not letting feeders overflow. If you have a mouse problem, consider hanging feeders well away from the house or taking them down until it is solved.

Compost

Compost attracts mice when it contains the wrong scraps or sits open. Health Canada warns that fatty or oily food scraps, eggs and dairy in the composter attract rodents. HealthLinkBC adds that it can help to cover food scraps, especially cooked food, meat or bones, and to use a pest proof compost container. The Public Health Agency of Canada recommends keeping compost bins away from buildings.

Fallen Fruit

Fallen fruit and nuts on the lawn are free food for mice. HealthLinkBC recommends removing fallen fruit and nuts from your yard, so pick up apples, crabapples and berries under trees and shrubs regularly in late summer and fall.

Woodpiles

Woodpiles stacked against the house give mice shelter right next to your walls. HealthLinkBC recommends storing firewood and lumber on stands off the ground, and the Public Health Agency of Canada advises moving woodpiles away from buildings.

Plants Against the House

Plants against the house give mice cover and a way up. Health Canada recommends cutting back tall grass and weeds near the house. HealthLinkBC suggests trimming plants so that 15 to 20 cm (6 to 8 inches) above the ground stays clear around the foundation, and trimming branches that touch the roof or balconies. UC IPM adds that house mice can be excellent climbers, so vines and shrubs climbing the walls should be thinned or removed.

Seed in Garages and Sheds

Seed stored in garages and sheds is often what draws mice to those spaces first. In garages, mice may eat sacked or spilled pet food and grass seed (Prevention and Control of Wildlife Damage). It helps to store grass seed, bird seed and pet food in metal bins with tight lids. Our guide to keeping mice out of the garage goes further.

What Keeps Mice Away?

What keeps mice away is a combination of removing what attracts them and sealing every gap they could use to get in. Neither works well alone: food storage makes your home less appealing, and sealing keeps out the mice that come looking anyway.

Food Storage

Food storage in hard containers removes the easiest meal. Health Canada recommends storing dry food and dry pet food in metal or glass containers. Move cereal, flour, rice, snacks and bird seed out of their original bags and boxes, and keep the lids closed.

Sealing Entry Points

Sealing entry points is the most lasting way to keep mice away. Health Canada notes that mice can get through cracks as small as a dime, and HealthLinkBC recommends sealing any opening larger than 6 mm (1/4 inch), with special attention to door jambs and the gap between siding and the foundation. Use materials mice cannot chew:

• Steel wool stuffed around pipes, then caulked or plastered over (Health Canada)
• Metal weather stripping under doors and weather stripping around windows (Health Canada)
• Fine metal mesh over dryer vents, attic vents and soffits (Health Canada)
• Usually concrete, mortar or metal flashing for foundation cracks (Public Health Agency of Canada)

Avoid relying on expanding foam, rubber, vinyl, plastic screening or wood alone: UC IPM says mice gnaw through them. For a room by room checklist, see how to find mice entry points and how mice get into your house.

Yard Maintenance

Yard maintenance keeps mice from setting up camp next to your foundation. Clean up fallen fruit, keep compost covered, store firewood off the ground and away from the walls, and trim grass and shrubs back from the house. These habits matter most from late summer, before the fall move indoors. Our full guide on how to keep mice out of your house covers each step.

Do Repellents Keep Mice Away?

Repellents do not reliably keep mice away. According to the University of California wildlife damage manual, ultrasonic devices have not been proven to control mice: rodents may avoid the area for a few days, then return. HealthLinkBC says ultrasound repellers work at first but have no long-term success, and Health Canada notes they lose effectiveness as rodents adapt. Peppermint oil sachets are sold for enclosed spaces like cupboards, but even their maker says repellents are not 100% effective when food or nests are nearby, and no government or university source reviewed shows that peppermint keeps mice out of a house. If you want to try one anyway, treat it as an extra on top of sealing and food storage. Our best mouse repeller review compares the options.

What Should You Do If Mice Are Already Inside?

If mice are already inside, removing attractants is not enough on its own: trap the mice you have, then seal the gaps and clean up safely. Mice that already live in your walls will not leave just because the crumbs are gone.

Signs of Mice

Signs of mice include small, dark droppings about 6 mm (1/4 inch) long, shredded nesting material, chewed food packaging and scratching sounds in walls or ceilings at night (HealthLinkBC).

Traps

Traps are the safest way for most households to remove mice. Health Canada recommends checking traps daily and setting about 1 trap per metre along walls where mice travel. UC IPM suggests a small amount of peanut butter as bait, and a cotton ball may also work, because mice often look for nesting material. The BC SPCA advises against glue traps, which the Government of British Columbia says may cause suffering. Our tested picks for the best mouse traps can help you choose.

Rodenticide Rules in Canada

Rodenticide rules in Canada are strict for homeowners. Health Canada says to always look for a Pest Control Products (PCP) number on the label, and the Government of British Columbia advises using domestic class rodenticides only in tamper-proof bait stations, never where children or pets can reach the bait. Consumer products containing second-generation anticoagulants are generally prohibited, and the Government of British Columbia restricts the sale and use of these products. HealthLinkBC also warns that poisoned mice may die inside walls and cause odours; NPIC notes rodenticides can be very toxic.

Safe Cleanup

Safe cleanup protects you from germs in droppings and urine. The Public Health Agency of Canada advises wearing rubber or plastic gloves, never sweeping or vacuuming droppings, and soaking the area with a Health Canada approved disinfectant or a mix of 1 part bleach to 9 parts water, then waiting about 10 minutes before wiping, as UC IPM also advises.

When to Call a Pest Control Professional

Calling a pest control professional makes sense when you keep catching mice after a couple of weeks, hear activity in several walls, or cannot find how they get in. HealthLinkBC recommends a licensed company when you cannot control rodents on your own. A professional inspection usually focuses on entry points and on the same attractants listed above. Our guide on when to call an exterminator for mice explains the warning signs, and you can get a quote from a recommended local exterminator through Pest Agent's referral form.