How to Get Rid of Mice in 2026: What Works, What Doesn't, and When to Call

You heard it first — a scratch in the wall at 2 a.m., or a scurry under the dishwasher — and then you found the proof: a scatter of dark droppings behind the toaster, a chewed corner on the dog-food bag. It's fall, the nights just turned cold, and a mouse decided your kitchen beats the yard. Fair enough. It also decided this before you noticed.

Here's the honest version of what happens next: a mouse problem caught early is a pest job a careful homeowner can genuinely finish. The method isn't a secret, and it isn't expensive. But the method has a hard second half that's easy to skip, and skipping it can leave the same house trapping mice again next October. This guide gives you the method — what works, in what order — and then tells you plainly where it stops working and what the professional version costs when you reach that line.

One fact explains the timing, straight from the University of California's Statewide IPM Program (UC IPM): house mice "frequently enter homes in autumn when nighttime temperatures become colder." The first cold snap is the starting gun. What you do in the next two weeks can decide whether you have a mouse or a population.

First, confirm it's a mouse

A house mouse is small — about five to seven inches long, and three to four of that is tail — light brown to gray, weighing about half an ounce. If what you saw was closer to the size of your hand with a thick, scaly tail, you're dealing with a rat, and that's a different job (start with a licensed local rodent pro). For mice, the evidence is what you'll find, not what you'll see:

• Droppings, usually concentrated where they eat and travel: under the sink, behind appliances, in the pantry, along walls.
• Fresh gnaw marks on food packaging, cardboard, or the soft edges of cabinetry.
• Nests of finely shredded paper, fabric, or insulation in a dark, undisturbed spot.
• A musky odor in enclosed spaces — a sign the problem is bigger, or has been running longer, than you thought.

Mice are homebodies. UC IPM notes they seldom travel more than about 30 feet from the nest and food supply. That's useful: the droppings aren't random, they're a map. Wherever the sign is densest, the nest is seldom far.

The DIY method that actually works: trap, then seal

The product aisle wants to sell you a gadget. Public-health guidance is almost boringly consistent about what works, and here it is in two steps.

Step 1 — Trap hard, trap fast

Use traditional snap traps. That's the CDC's recommendation, and it's explicit about what not to use: "Do not use glue traps and live traps," because these traps can scare a mouse into urinating, and that can raise your odds of getting sick from it. Snap traps are cheap anyway.

Use more traps than feels reasonable. One DIY mistake is two traps for a problem that needs ten. UC IPM's guidance is to "use enough traps to make the trapping period short and decisive," spaced "no more than about 10 feet apart in areas where house mice are active." Setting them in pairs, an inch or two apart, can catch the mice that jump the first one.

Put them where the mice already are. Along walls, behind the stove and refrigerator, in the backs of cabinets and drawers, in dark corners — wherever you found droppings. The droppings are the map; the traps go on it.

Bait with what they're eating. Peanut butter is a popular choice for a reason: easy, sticky, and mice love it — though UC IPM notes it "can pose allergy risks to people in some situations." If they've been in the birdseed or the pet food, use that. A pinch of cotton or dental floss can work too — nesting material is bait in October.

Keep going until the catches stop. Check daily, re-set, and don't declare victory after the first two. The CDC's instruction is to "continue trapping until there are no more rodents." With the trap count right, that's what "short and decisive" means.

Step 2 — Seal, or you may do Step 1 again next fall

This is that second half, and it's the half that matters. UC IPM puts it flatly: "Exclusion is the most successful and permanent form of house mouse control." Trapping without sealing is a treadmill.

The sizes are the surprise. A mouse can get through a hole "the width of a pencil" — a quarter inch — per the CDC, and under a gap a quarter inch tall, per UC IPM. So the gaps that count include ones you might not call holes. The CDC's checklist of where to look is a good one to use. Among its spots inside the home: inside, under, and behind kitchen cabinets; around the pipes under sinks and washing machines; behind appliances; around dryer and floor vents; around every electrical, water, gas, and sewer line; and along the floor-and-wall juncture. Outside: in the roof among the rafters, gables, eaves, and soffits; around windows and doors (especially those without weather stripping); between the foundation and the ground; around attic and crawl-space vents; and around the holes where electrical, plumbing, cable, and gas lines come in.

The fix is cheap and specific. For small holes, the CDC's method is steel wool packed into the gap, held in place with caulk. For larger openings, use lath screen, hardware cloth, cement, or metal sheeting. Then clean up the attractants: pet food in sealed containers, birdseed off the garage floor, crumbs out of the toaster drawer. Sanitation alone, as UC IPM notes, "will seldom completely control house mice" — but combined with sealing, it removes a reason to come back.

Do both steps, starting in the first two weeks, and you'll very likely win. The trouble starts when you do one of them, or when the problem is already past the point where the two together are enough.

Where DIY stops working — and how to know you're there

Mice don't wait for your weekend. UC IPM is candid that "there is no simple and easy fix for controlling house mice." Its numbers: in a single year, a female "may have 5 to 10 litters of about 5 or 6 pups each," with young "born 18 to 21 days after conception." The mouse you heard in September can be a family by Halloween. That math is part of why these four situations are past the DIY line:

The catches don't stop. If you're still trapping mice after two to three weeks of a serious effort — a dozen traps, checked daily, baited right — you may not be catching a population down to zero — you may be catching the overflow of a population you can't reach. Something is feeding it and something may still be admitting it.

The activity is in the walls, the attic, or the crawl space. Scratching overhead at night, droppings in the insulation, a nest you can smell but can't find. Traps on the kitchen floor don't reach the nest of a colony that lives above the ceiling and commutes.

You can't find the entry. You've sealed everything you can see and they're still inside. The CDC's own list puts entry points in the roof among the rafters, gables, eaves, and soffits, and between the foundation and the ground — places that can take a flashlight, a ladder, and experience to find.

You're reaching for poison. The CDC says to "only use poison or bait stations for mouse and rat infestations that persist," and warns that "poison baits can be dangerous for people and animals." There's a practical problem too: UC IPM notes rodenticide "will often result in house mice dying inside the structure," which can mean the smell of a dead mouse in a wall void you can't open. Baits also "generally take several days" to work. If you're at the point of poison, you're at the point of calling.

And one more: if anyone in the house is immunocompromised, or there's a baby, or the droppings are in a food-prep area, the cleanup matters as much as the catch. Mice carry diseases including salmonella and leptospirosis, and exposure can come through their urine and droppings.

What getting it wrong actually costs

This is the part worth reading before you decide to "wait and see." Real figures, so you can sanity-check any quote:

• A professional mouse job: $150 to $550. That's industry cost data for mice extermination, inside the $150–$600 range for rodent removal generally. A straightforward job — trapping a few mice — sits at the low end.
• Exclusion add-ons: $200 to $400 per rodent-exclusion door, for the entry points that need a one-way fix rather than a plug.
• Cleanup after an established infestation: $600 to $1,000 for a cleanup service, plus $2 to $6 per square foot to replace attic insulation after sanitizing — because mice don't just nest in insulation, they contaminate it.
• Chewed wiring: $5 to $17 per square foot to rewire. UC IPM's line is one to remember: "Many fires of unknown origin are believed to be caused by rodents gnawing on wires." Mice can gnaw electrical wires and gas lines — that's the risk you're carrying while you wait.
• A large infestation that needs the building sealed and cleaned: $1,000 to $8,000.

Notice the shape of that list. The mouse itself is the cheap part. Most numbers after the first one are the cost of time — the weeks between the first dropping and the call, during which the colony grew, the insulation got ruined, and the wire got chewed. A $150 problem in October can become a $1,500 problem by February with no change in effort on your part.

Where you live moves the first number, and the timing, too. In older, denser housing stock — Chicago, New York, Boston, Philadelphia — buildings tend to have more entry points to seal, and sealing one apartment doesn't seal the building. In Denver and Columbus, the fall cold snap typically arrives earlier than in New York, Boston, or Philadelphia, so mice can start moving in sooner. Our 2026 U.S. Rodent Pressure Index ranks 52 metros by a year of rat and mouse search demand and by what pest-control advertisers pay for a call — if you want to see whether your city made the top 25, it's there.

What a professional does differently

It isn't a braver person with the same snap traps. Much of the difference is in the second half of the job. A professional rodent service starts with an inspection that goes where you don't: the roofline, the soffits, the crawl space, the foundation line, the vents — finding the quarter-inch gaps that are letting the next generation in. Exclusion is done with materials that hold (hardware cloth, metal flashing, sealed penetrations). Where cleanup is needed, it's done with the protective gear and sanitizing products that make contaminated insulation safe to handle. And the whole thing comes with something a hardware-store bag can't: someone whose job is finding where the mice are getting in.

If the activity is in a food area or a nursery, or you've got a tenant turnover on a deadline, say so when you call — it's worth asking about same-day availability.

The bottom line

One or two mice, caught early, in the kitchen: that's your job. A dozen snap traps along the walls, peanut butter, checked daily, and then — this is the part that counts — steel wool and caulk in every pencil-width gap you can find. Done in about two weeks, likely done for the year.

Mice in the walls or attic, catches that won't stop, entry points you can't find, or a hand reaching for poison: that's a pro's job. Mouse jobs average $150 to $550, and cases like these often cost more; as the list above shows, most of what comes above that range is what waiting can cost.

The nights are getting colder now. Whichever bucket you're in, deal with it while it's still the small version of the problem.

About the author

Eli Hartman writes about pest identification, treatment, and prevention for Pestcura. Content is reviewed against EPA guidance and current pest research before publication. Pestcura is a nationwide network connecting homeowners to licensed local pest control professionals.