Quick answerSet snap traps perpendicular to walls where you've seen droppings, baited with peanut butter — then seal every gap bigger than a dime with steel wool and caulk. Trapping without sealing just invites the next mouse in; sealing without trapping leaves the current one inside.
What you'll need
- Snap traps (the classic wooden kind — $5–$8 for a 4-pack; avoid cheap plastic ones that misfire)
- Peanut butter (a pea-sized dab is plenty)
- Steel wool or copper mesh ($5–$7)
- Caulk or expanding foam
- Flashlight
- Disposable gloves
- Airtight containers for pantry food
Step-by-step
- Confirm it's mice, not rats. Mouse droppings are the size of rice grains with pointed ends. Rat droppings are bigger, like raisins. This matters because rat traps and mouse traps are different sizes — a mouse will steal bait from a rat trap without triggering it.
- Find the droppings and rub marks. Check along baseboards, behind the stove and fridge, inside lower cabinets, and in the pantry. Mice travel along walls, so droppings clustered near wall edges tell you exactly where to put traps.
- Set snap traps perpendicular to the wall. Place the baited end facing the wall, about 2–3 inches out. Mice run along baseboards and will walk straight onto the trigger. Use 4–6 traps for a typical sighting — one trap is never enough.
- Bait with a tiny amount of peanut butter. A pea-sized smear on the trigger is ideal. Big globs let mice nibble it off without setting off the trap. Press it into the trigger so they have to work for it.
- Check traps every morning. Reset triggered traps and move any that haven't caught anything after 2–3 nights a few feet along the wall. Wear gloves — mice avoid the smell of humans on traps, and you'll want gloves for disposal anyway.
- Hunt for entry points. A mouse fits through a hole the size of a dime. Check where pipes and cables enter the house, gaps under doors, dryer vents, and foundation cracks. Go outside too — most entries are found from the exterior.
- Seal with steel wool plus caulk. Stuff steel wool or copper mesh tightly into holes (mice can't chew through it), then seal over it with caulk or foam. Foam alone isn't enough — mice chew straight through it.
- Remove the food. Transfer cereal, rice, pet food, and snacks into hard sealed containers. A mouse that can't find food won't stay, and won't attract others.
<div class="safety"> <strong>🛑 Stop and call a pro if:</strong> <ul> <li>You hear scratching or squeaking inside walls or ceilings — the nest is somewhere you can't trap effectively.</li> <li>You find droppings in many rooms or large amounts in one spot, which suggests an established population, not a lone mouse.</li> <li>Traps stay empty for weeks but droppings keep appearing — you may be dealing with rats or a entry point you haven't found.</li> <li>There's a strong ammonia smell in an enclosed space like an attic, which can mean a large infestation needing professional cleanup.</li> </ul> </div>
DIY vs pro cost
| Option | Typical cost |
|---|---|
| DIY | $10–$25 |
| Pro visit | $150–$350 |
Printable checklist
- [ ] Identify droppings (rice-grain size = mice)
- [ ] Place 4–6 snap traps perpendicular to walls
- [ ] Bait with pea-sized dab of peanut butter
- [ ] Check and reset traps each morning
- [ ] Find entry points inside and outside
- [ ] Seal holes with steel wool + caulk
- [ ] Move pantry food to sealed containers
- [ ] No catches for a week? Reassess trap placement
Related guides
- How to Get Rid of Ants in the House (That Actually Works)
- How to Get Rid of Cockroaches Permanently (Pro Method)
- How to Remove a Wasp Nest Safely (Small Nests Only)
Frequently asked questions
How do mice get into the house in the first place?
Through gaps you'd never notice — around pipes, under garage doors, through vents without screens, and foundation cracks. They follow warm air currents in autumn, which is why sightings spike when the weather turns cold.
Are humane catch-and-release traps a good idea?
They work for catching, but released mice often return or die slowly outdoors away from their food source. If you go this route, release at least a mile away in suitable habitat — and know that sealing entry points matters far more than which trap you use.
Why shouldn't I use poison?
Poisoned mice don't die on the spot — they crawl into wall voids and die there, and the smell can linger for weeks. There's also a real risk to pets, owls, and other wildlife that eat poisoned rodents. Snap traps are faster, more humane, and you know where the body is.
How long until the mice are gone?
With good trap placement and sealed entries, most single-mouse situations resolve within a week. If you're still catching mice after two weeks, there's an entry point you haven't found yet — do another perimeter check, especially at dusk when gaps are easier to spot from outside.
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