How to get rid of mice?

How to Get Rid of Mice: Complete Guide

Mice are more than a nuisance — they contaminate food, chew through wires (creating fire hazards), and leave droppings that can spread diseases like hantavirus and salmonella. If you see one mouse, there are likely 5–10 more hiding. Here's how to eliminate them and keep them out for good.

Step 1: Identify Signs of a Mouse Problem

• Droppings — Small, dark, rice-shaped pellets (1/4 inch long) found along baseboards, in cabinets, and near food sources
• Gnaw marks — On food packaging, wood, drywall, and especially wiring
• Scratching sounds — In walls, ceilings, or under floors, especially at night
• Grease marks — Dark rub marks along walls and baseboards where mice travel
• Nesting materials — Shredded paper, fabric, or insulation in hidden areas
• Musty odor — Mouse urine has a distinct ammonia-like smell

Step 2: Set Traps (Most Effective DIY Method)

Trapping is the fastest and most effective way to reduce mouse populations.

Best Mouse Traps

Trap Type	Cost	Best For
Snap traps (Victor, Tomcat)	$2–$5 each	Most effective overall; quick, humane kill
Electronic traps (Victor M250S)	$25–$45 each	Clean, no-touch kill; reusable; good for squeamish users
Live catch traps	$5–$15 each	Humane option; must release 2+ miles away
Glue traps	$3–$8 for a pack	Not recommended — inhumane and less effective

Trapping Tips

• Use peanut butter as bait — It's the most effective attractant. Use a pea-sized amount.
• Place traps perpendicular to walls with the trigger end touching the baseboard (mice run along walls)
• Set 6–12 traps even if you think you have just one mouse
• Place traps every 5–10 feet along walls, behind appliances, under sinks, and in the attic/basement
• Check traps daily and reset or relocate after 2 days if no catches
• Wear gloves when handling traps and dead mice — dispose of mice in sealed bags

Step 3: Seal Entry Points (Exclusion)

This is the most critical step. Mice can squeeze through gaps as small as 1/4 inch (about the diameter of a pencil).

Common Entry Points to Seal

• Gaps around plumbing pipes under sinks and where they enter walls
• Holes where utility lines (cable, gas, electrical) enter the house
• Gaps under exterior doors (install door sweeps)
• Cracks in the foundation
• Dryer vents and exhaust fan openings (add hardware cloth covers)
• Gaps around window air conditioners
• Roof-soffit junctions and gable vents

Best Sealing Materials

• Steel wool + caulk — Stuff steel wool into gaps, then seal with silicone caulk. Mice can't chew through steel wool.
• Copper mesh (Xcluder) ($10–$20) — Better than steel wool; doesn't rust, harder for mice to pull out
• Hardware cloth (1/4" galvanized) — For larger openings like vents and crawl space access
• Expanding foam + steel wool — Foam alone won't stop mice; combine with steel wool

Step 4: Remove Food Sources

• Store all food (including pet food) in airtight glass or metal containers
• Clean up crumbs immediately and wipe counters nightly
• Don't leave pet food out overnight
• Keep trash cans sealed with tight-fitting lids
• Store birdseed in sealed containers (and consider removing bird feeders temporarily)
• Pick up fallen fruit from trees near your home

Step 5: Reduce Outdoor Attractants

• Move woodpiles at least 20 feet from the house
• Trim vegetation and ground cover near the foundation
• Eliminate standing water sources
• Keep garage doors closed
• Store outdoor pet food and birdseed in sealed metal containers

What NOT to Do

• Don't use poison/rodenticide indoors — Mice die in walls, creating horrible odors lasting weeks. Save bait stations for exterior use only.
• Don't rely on ultrasonic repellers — Studies show they don't work. The FTC has fined companies for false claims.
• Don't use mothballs — Ineffective against mice and the fumes are harmful to humans and pets.
• Don't get a cat as your sole solution — Cats may catch a few mice but won't solve an infestation with a nest in your walls.

When to Call a Professional

Call a professional mouse exterminator if:

• You're catching mice in traps but new ones keep appearing
• You hear activity in walls, attic, or crawl space
• You find droppings in multiple areas of the home
• You can't locate entry points
• The infestation has been ongoing for more than 2 weeks despite DIY efforts

Professional mouse control costs $200–$600 and includes trapping, exclusion, and follow-up visits. Find a local pest control pro at ProFindr to get fast, effective mouse removal.

Frequently Asked Questions

How many mice usually live together?

A typical mouse nest has 5–12 mice, but a single pair can produce 60+ offspring per year. Without intervention, a small problem can become a major infestation within 2–3 months.

Do mice come back after extermination?

Only if entry points aren't sealed. Proper exclusion (sealing all gaps 1/4 inch or larger) is essential. Without it, new mice will find the same pathways into your home.

Are mice dangerous?

Yes. Mice spread hantavirus, salmonella, and leptospirosis through their droppings and urine. They also chew electrical wires, which is a leading cause of house fires. Their allergens can trigger asthma, especially in children.

What time of year are mice worst?

Mouse activity peaks in fall and winter (October–February) when they seek warm shelter. However, mice can enter homes year-round. Prevention and sealing should be done before fall for best results.

Can mice climb walls?

Yes. Mice are excellent climbers and can scale most vertical surfaces including brick, wood, and textured walls. They can also jump 12 inches high, swim, and squeeze through 1/4-inch gaps. This is why sealing entry points at all heights, including the roofline, is important.