To get rid of mice, seal the gaps they enter through, set plenty of snap traps along the walls where they travel, and cut off their food and shelter. Mice breed fast and squeeze through a hole the size of a dime, so success comes from doing all three at once — and from using enough traps. Trapping is more effective and cleaner indoors than poison, which leaves mice dying inside walls.
Key Takeaways
- Seal every gap — a mouse fits through a quarter-inch hole (about the size of a dime).
- Use many snap traps — mice are curious (unlike rats), so set a dozen or more along walls.
- Remove food and shelter — sealed food, no crumbs, less clutter.
- Skip poison indoors — mice die in walls (odor) and bait risks pets and wildlife.
- Move fast — a few mice become many quickly; they breed year-round indoors.
Why mice are different from rats
Mice are small, curious, and breed prolifically — a female can produce dozens of offspring a year. Unlike cautious rats, mice readily investigate new objects, so traps work quickly without days of pre-baiting. They also need only a tiny gap (about a quarter inch) to enter, which makes thorough sealing essential. (If you have the larger, more cautious rats instead, see how to get rid of rats.)
Step 1: Seal the entry points
Exclusion is what stops mice for good. Because the gaps are so small, inspect carefully:
- Pack holes with steel wool or copper mesh plus caulk, or cover them with hardware cloth or sheet metal — mice gnaw through foam and plastic.
- Check around pipes, under sinks, behind appliances, in the foundation, and along the garage door.
- Add door sweeps and seal gaps under exterior doors.
- Cover vents and chimneys with fine metal mesh.
Sealing entry points is the backbone of rodent control (CDC: Rodent Control).
Step 2: Trap (use more than you think)
Snap traps are the most effective and humane-by-speed option, and the key is quantity:
- Set a dozen or more traps, spaced a few feet apart along walls where you see droppings (mice travel the edges).
- Bait with peanut butter or a small piece of soft food pressed into the trigger.
- Place traps perpendicular to the wall with the trigger end against it.
- Compare options in the best mouse traps guide; sticky glue traps can monitor activity but are slower and less humane. For a large infestation, see how to treat a severe mouse infestation.
Under-trapping is the most common mistake — a few traps barely dent a breeding population.
Step 3: Cut off food and shelter
Remove what keeps mice around:
- Store food and pet food in sealed metal or glass containers; mice chew through cardboard and plastic bags.
- Clean up crumbs and spills, don’t leave dishes out, and secure the trash.
- Declutter storage areas and keep stored items off the floor — clutter is nesting habitat.
Why not just use poison?
Poison is a poor first choice indoors. Mice that eat bait often die in inaccessible wall voids, creating a lingering odor, and rodenticides risk secondary poisoning of pets and predators. Ultrasonic gadgets aren’t the answer either — the evidence shows ultrasonic repellers don’t work, and neither do electronic pest repellers. Trapping plus exclusion is cleaner, safer, and more reliable.
Frequently Asked Questions
What is the fastest way to get rid of mice?
Set many snap traps (a dozen or more) along the walls where mice travel, baited with peanut butter, while sealing entry points and removing food. Mice are curious and trap quickly without pre-baiting, so heavy trapping plus exclusion clears them fast.
How many mouse traps should I set?
More than feels necessary — at least a dozen for an active infestation, spaced a few feet apart along walls. Under-trapping is the top reason people fail; with a fast-breeding population, a couple of traps barely keep up.
Should I use poison or traps for mice?
Traps, indoors. They’re confirmable and avoid mice dying inside walls, and they don’t risk poisoning pets or wildlife. Save rodenticides for outdoor, tamper-resistant stations if at all, and pair any approach with sealing entry points.
How are mice getting into my house?
Through gaps as small as a quarter inch — around pipes, under doors, behind appliances, in the foundation, and at vents. Follow droppings and gnaw marks to find the routes, then seal each with steel wool, hardware cloth, or metal, since mice chew through softer materials.