Quick Answer: To get rid of mice, set snap traps along walls where you see droppings, seal every entry hole larger than a dime with steel wool and caulk, and remove food sources by storing food in sealed containers and cleaning up crumbs. Mice reproduce fast, so act quickly: trap aggressively for one to two weeks while you seal entry points. Avoid relying on poison alone, since mice can die inside walls and create odor problems.
Finding mouse droppings in your pantry is unpleasant, but a mouse problem is very fixable. Mice are not invincible invaders; they are small animals following food, warmth, and shelter. Remove those three things and seal their entry routes, and most infestations resolve within a couple of weeks.
This guide covers how to confirm you have mice, trap them effectively, seal your home, and keep them from coming back.
Signs You Have Mice
Before you act, confirm the culprit. Mice leave distinctive evidence:
- Droppings: Small, dark, rice-grain-sized pellets (about 1/8 to 1/4 inch) along walls, in cabinets, and near food. Fresh droppings are soft and dark; old ones are hard and gray.
- Gnaw marks: Mice must chew constantly to wear down their teeth. Look for chewed food packaging, wood, wiring, and plastic.
- Scratching and scurrying sounds in walls or ceilings, especially at night when mice are most active.
If the droppings are larger (raisin-sized) and you hear heavy thumping, you may be dealing with rats instead. See our guide on how to get rid of rats step by step guide 2026“>how to get rid of rats for the differences and adjusted tactics.
Step 1: Find Where They Travel
Mice are creatures of habit. They travel along walls and baseboards, rarely crossing open rooms, because their poor eyesight keeps them hugging vertical surfaces. Place a few unset, baited traps for a night or two to identify high-traffic routes, or simply look for droppings concentrated along walls, behind the stove, under the sink, and in the pantry.
Also inspect the exterior of your home. Common entry points include gaps around pipes and utility lines, under doors, foundation cracks, dryer vents, and where the siding meets the foundation. The CDC’s rodent guidance at the CDC’s rodent control guidance stresses that sealing entry points is the most important long-term control step.
Step 2: Trap Them Effectively
Trapping is the fastest, most reliable way to remove mice already inside. Poisons work more slowly and risk mice dying in inaccessible spots.
Snap traps (best all-around choice)
- Use plenty of them. For a moderate infestation, set 6 to 12 traps. More traps catch mice faster than a few traps checked repeatedly.
- Place traps perpendicular to walls with the trigger end touching the baseboard, since mice run along walls.
- Bait with peanut butter, chocolate, or hazelnut spread. A pea-sized amount smeared on the trigger works better than cheese. Tie bait on with dental floss so mice must work the trigger.
- Check daily and reset or replace as needed.
Live-catch traps
Humane traps catch mice alive for release. If you use them, release mice at least a mile from your home in a suitable outdoor area, and check traps at least daily. Be aware that relocated mice often do not survive, and in some areas release is restricted.
What about glue traps?
Most pest professionals and humane organizations advise against glue traps. They cause prolonged suffering, catch non-target animals, and a panicked mouse can drag a glue trap into a wall void. Snap or electronic traps are both more humane and more effective.
Step 3: Seal Every Entry Point
Trapping without sealing is like bailing water without plugging the leak. Mice excluded today will be replaced by new mice tomorrow.
- Stuff holes with steel wool or copper mesh, then seal over with caulk or expanding foam. Mice cannot chew through steel wool, but they can chew through foam alone, so always combine them.
- Seal gaps around pipes under sinks, behind toilets, and where utilities enter the house.
- Install door sweeps on exterior doors, including the garage door. Check that weatherstripping is intact.
- Repair foundation cracks and gaps where siding meets the foundation with mortar or exterior-grade caulk.
- Screen vents: Cover attic vents, crawl space vents, and chimney openings with 1/4-inch hardware cloth.
- Check the garage: Garages are the number one mouse entry point. Seal the gap under the garage door and any holes in garage walls.
Step 4: Remove Food and Shelter
Mice need very little food, a few crumbs a day sustains them, so be thorough:
- Store dry goods in sealed containers. Glass jars, hard plastic containers, or metal tins. Mice chew straight through cardboard boxes and plastic bags.
- Clean up crumbs and spills promptly, especially under the stove, refrigerator, and toaster.
- Take out trash regularly and use cans with tight lids.
- Trim vegetation away from the foundation and keep firewood and lumber stacked off the ground and away from the house.
These sanitation habits also discourage other invaders. If roaches are part of the problem, read how to get rid of german cockroaches step by step guide 2026“>how to get rid of German cockroaches as well.
Should You Use Poison?
Rodenticide baits have serious downsides for indoor use:
- Mice die in walls. Poisoned mice often retreat into wall voids before dying, creating a terrible odor for weeks that you cannot easily remove.
- Secondary poisoning. Owls, hawks, cats, and dogs can be poisoned by eating a poisoned mouse. Anticoagulant rodenticides are a documented threat to wildlife.
- Slow and uncertain. It can take days for poison to work, during which mice keep breeding and contaminating food.
The EPA’s rodenticide guidance at the EPA’s rodenticide guidance details restrictions on consumer bait products, including requirements for tamper-resistant bait stations. If you do use bait, place it only in locked, tamper-resistant stations, keep it away from children and pets, and treat it as a supplement to trapping and sealing, never the whole plan.
Preventing Mice From Coming Back
Once the house is clear, stay vigilant, especially in fall when mice seek winter shelter:
- Re-inspect seals each autumn before cold weather drives mice indoors.
- Keep a few snap traps set in the garage, basement, and attic as early warning sentinels.
- Maintain the sanitation habits above year-round.
Frequently Asked Questions
How do mice get into the house?
Through holes as small as a dime: gaps around pipes and utility lines, under doors, foundation cracks, vents, and garage doors. They are excellent climbers and can scale rough walls, downspouts, and vegetation touching the house.
How many traps should I set?
For a typical infestation, 6 to 12 snap traps placed along walls in active areas. A good rule of thumb: if traps are catching mice nightly, you do not have enough traps out yet.
Is it safe to vacuum mouse droppings?
Do not sweep or vacuum droppings dry, which can aerosolize viruses like hantavirus. The CDC recommends spraying droppings with disinfectant, letting it soak for five minutes, wiping up with paper towels, then mopping. Wear gloves and a mask.
When should I call a pest control professional?
Call if trapping has not reduced activity after two weeks, if mice are in wall voids or attics you cannot access, if you suspect rats rather than mice, or if anyone in the home is immunocompromised and needs the contamination handled professionally.
