How to Get Rid of Mice in Your House for Good

You heard it last night. That soft scratching behind the wall, or a tiny shadow darting under the stove. Now you want the fastest way to make it stop. Here is the honest truth about how to get rid of mice in your house: setting a few traps is the easy part, and it is also the part that fails most people. Trap a mouse today and two more walk in tomorrow through the same gap it used. The real fix is to close the door first, then deal with whoever is already inside.

So that is exactly how we are going to do this. Seal the house so no new mice can get in. Trap the ones already here. Then clean up so the whole thing never starts again. It is not hard. It just has to happen in that order.

A quick, honest note: some of the products below are ones we may earn a small commission on if you buy through our links. It costs you nothing extra, and we only point to gear that actually does the job. Pick whatever brand you trust.

Why Mice Pick Your House in the First Place

A mouse did not wander in by accident. It came for three things every house quietly hands out: something to eat, somewhere warm, and a way in. Your kitchen crumbs, the pet food bag, the cozy gap behind the dishwasher. To a mouse, your home is a heated pantry with the door propped open.

Here is the part that should light a fire under you. Mice breed fast, really fast. The University of California Statewide IPM Program confirms a single female can have five to ten litters in a year, with about half a dozen pups each time, and those pups can start breeding at around six weeks old. So the one mouse you saw is almost never just one mouse. It is a scout, and the clock is already running. This is why “how to get rid of mice in your house” is a job you want to finish this week, not next month.

The good news is that the same things that invited them in are the exact levers you get to pull to push them back out. Take away the entry, the food, and the shelter, and a mouse has no reason to stay and no way to return. Everything below is just doing that in a smart order.

How to Seal Every Gap Before You Set a Single Trap

This is the step almost every quick guide skips, and it is the reason people end up trapping mice for months. Think about it. If your basement wall has a gap the size of a nickel, you can catch mice all winter and the parade never ends, because the door is still open. Sealing is what turns “getting rid of mice” from an endless chore into a one-time fix.

The number that surprises everyone: a young mouse can flatten itself through a gap about 1/4 inch wide, roughly the width of a pencil. Their skull is the only truly rigid part of the body, so if the head fits, the whole mouse fits. An adult still slips through a gap barely wider than a pencil, roughly 3/8 inch, smaller than you’d ever suspect. That means the crack you would never think twice about is a wide-open front door to them. A young rat needs more room, closer to 1/2 inch, which is exactly why you seal every gap to the smallest offender in the house, not just the biggest one.

Pack Gaps With Steel Wool, Then Lock It In With Caulk

Here is the two-part trick that actually holds. First, stuff the gap tight with coarse steel wool. Mice hate chewing it because the sharp metal fibers hurt their mouths and they cannot get a grip on it, so they give up. Pack it in firmly with a screwdriver until the hole is dense and full.

Steel wool alone can eventually be tugged loose or can rust, so you lock it in place. Run a bead of silicone caulk over and around the packed steel wool so it is glued in and weatherproofed. Now the gap is both mouse-proof and sealed against drafts and damp. For a hole bigger than a coin, back the steel wool with hardware cloth (a stiff metal mesh) or a patch of sheet metal before you caulk, since a determined mouse can worry loose a plug that is only wool.

Fix: for the common gap where a pipe enters the wall, wrap the steel wool right around the pipe like a collar, then seal the seam with caulk. That pipe entry is the single most common way mice get from the crawlspace into your kitchen.

Why Expanding Foam Fails and What Beats It

It is tempting to grab a can of expanding spray foam and blast every hole shut. Do not. Mice chew through standard expanding foam like it is a marshmallow, and they will happily tunnel a fresh doorway right through your handiwork within a week. Foam looks sealed to you and reads as “soft, chewable, and warm” to them.

Caulk works because it is only ever the outer skin over a metal plug, not the barrier itself. The steel wool is the thing a mouse cannot beat; the caulk just holds it and finishes the seal. If you only remember one line from this whole article, make it this: metal stops mice, foam invites them. There are rodent-blocking foams sold with embedded fibers, but plain steel-wool-plus-caulk is cheaper, easier to find, and proven.

The Main Types of Mouse Traps and Which to Use

With the house sealing up behind you, now you go after the mice already inside. There are a handful of trap types and they are genuinely not equal. Here is the honest rundown so you buy the right thing once instead of the wrong thing three times.

1 Classic Snap Traps, the Cheap Reliable Workhorse

The old wooden snap trap is still the one most pros reach for, and for good reason. It costs about a dollar, it kills instantly (which is more humane than a slow death), and you can set out a dozen at once without spending real money. The classic Victor wooden snap trap is the icon of the category, and it flat-out works.

The secret is the bait and the setting. Skip the cartoon cheese. Use a tiny smear of peanut butter, which is sticky and smelly and forces the mouse to really work the trigger. Set the trap so the baited trigger end sits flat against the wall, because that is the path the mouse is already walking. Bait it without setting it for the first night or two so the mice learn to trust it, then arm it. That patience roughly doubles your catch rate.

Caveat: wash your hands or wear gloves when handling a fresh trap. Mice have a sharp nose and can smell human scent on a brand-new trap, which makes a cautious mouse hang back.

2 Electronic Traps for a Clean, No-Touch Kill

If the idea of emptying a snap trap makes you queasy, an electronic trap is your friend. The mouse walks into an enclosed chamber, completes a circuit, and gets a quick high-voltage jolt that kills it fast and out of sight. You never see or touch the mouse. When a light blinks to signal a catch, you just tip the whole thing into the trash and reset it.

They cost more than snap traps, usually somewhere in the twenties to forties per unit, and they run on batteries you have to keep fresh. But for a squeamish household or anyone who wants a tidy, repeatable kill in the kitchen or pantry, a reusable Victor electronic trap earns its price fast. Place them the same way as snap traps: flush against a wall on the mouse’s travel route.

4 Sealed Bait Stations for Garages and Wall Voids

A sealed rodent bait station is a locked plastic box that holds rodenticide bait behind a small entry hole. The point of the box is safety: the poison is enclosed so a curious dog, cat, or child cannot reach it. These make the most sense in spots you cannot easily reach or watch, like a garage, a shed, or along an exterior wall where mice travel.

Be careful and honest with yourself about poison, though. A poisoned mouse often crawls off to die inside a wall, which leaves you with a smell you cannot ignore for a week or two. Poison also carries a real risk to pets and wildlife, both directly and through secondary poisoning when a cat or owl eats a poisoned mouse. The U.S. Environmental Protection Agency restricts the strongest rodenticides to professionals and requires tamper-resistant bait stations wherever kids or pets can reach. For most indoor infestations, traps are the cleaner, safer choice, and bait stations are a backup for the outdoor edges.

Where to Place Mouse Traps So They Actually Catch

You can buy the best traps in the store and catch nothing if you set them in the middle of the floor. Placement is where most people quietly lose. Mice have terrible eyesight and they are nervous in open space, so they almost never stroll across the middle of a room. Instead they hug the walls, using their whiskers to feel the edge as they go. Your traps have to sit on that highway.

So set traps flush against the wall, with the trigger end touching the baseboard, so a mouse running the edge steps right onto it. Place them in pairs a few inches apart, because a mouse dodging one may trip the other. Space groups of traps every 6 to 10 feet along a wall where you have seen activity, and double up in corners, where mice slow down to turn. Behind the stove, under the sink, along the back of a pantry, and in the garage against the wall are all prime spots.

Whether Ultrasonic Repellers Are Worth Your Money

Those plug-in ultrasonic gadgets promise to flood your home with a sound only mice can hear and drive them out without a single trap. It sounds perfect. The honest verdict is that they barely work, and not for long, so do not let one become your whole plan.

Two things get in the way. First, ultrasonic sound does not travel through walls, furniture, or clutter, so a single unit only affects the open air of one room and does nothing for the mouse nesting inside your wall. Second, mice are smart and adaptable. Study after study finds that rodents get used to the noise within days once they figure out it never actually hurts them, and then they carry on as if it were off. Most of all, a repeller kills nothing and evicts nothing. The mouse already in your house still has to be sealed out and trapped. If you enjoy the idea, treat a repeller as a very minor add-on, never a substitute for the real work.

How to Handle Mice in Walls, the Garage, and at Night

Some mouse problems come with their own quirks. Here is how to handle the three situations people ask about most, because each one needs a slightly different move.

Clean Up So the Mice Never Come Back

You have sealed the house and cleared the mice. This last step is what keeps them gone. Mice came for food, water, and shelter, so you take all three off the table. Keep grains, cereal, pet food, and snacks in metal or thick plastic containers with tight lids, since mice chew right through cardboard and thin plastic. Wipe up crumbs at night, run a tight lid on the trash, fix dripping taps, and clear the clutter piles that make cozy nests. Outside, move firewood away from the house and trim back shrubs that touch the walls.

Cleaning up droppings needs real care, because mouse droppings and urine can carry germs that become airborne when you sweep or vacuum them dry. The U.S. Centers for Disease Control and Prevention advises never to sweep or vacuum rodent waste. Instead, open windows to air the room for 30 minutes first, put on rubber gloves, spray the droppings and nest thoroughly with a disinfectant or a bleach solution of about one part bleach to ten parts water, let it soak for five minutes, then wipe everything up with paper towels and bag it. Never handle it dry.

Once you have done all this, keep two or three traps set and baited for a couple more weeks as an early-warning system. If nothing trips them, you have won. Staying mouse-free after that is mostly about not letting the gaps reopen and not turning the kitchen back into a buffet.