Mouse-Proofing Your Home: Keep Rodents Out for Good

Your House Shouldn't Be Their Home

Mice seek cozy indoor spots when autumn temperatures drop. They don't know they're unwelcome—they make themselves at home behind water heaters, under sinks, in garages, attics, closets, crawlspaces, and basements. Mice contaminate food, chew electrical wires, and transmit diseases. Keeping them out requires a sharp eye and effective defenses.

Understand the Enemy

The house mouse (Mus musculus) eats almost anything—seeds and grains outdoors; indoors, crumbs, nuts, pet food. They're enterprising, athletic, persistent, and reproduce astonishingly fast. "Rodents really rule the world," says wildlife control expert Stephen M. Vantassel. "But there's no reason to tolerate a mouse problem." The key: change the habitat to make it less mouse-friendly.

Exterior Prevention

• Store birdseed in plastic or metal containers.
• Place rag bags, burlap, row covers, landscape fabric in sturdy containers.
• Re-stack woodpiles; remove garden brush heaps.
• Seal all gaps from foundation to roof—mice squeeze through ¼-inch cracks (dime-sized hole = open door).

Interior Defenses

• Keep a clean house, but know a mouse can survive days on a single cereal flake.
• Store dry pet food in sealed containers; don't leave pet dishes out overnight.
• Close gaps with copper mesh Stuf-fit or Xcluder (stainless steel fabric). Mice leap 9.5 inches vertically and are outstanding climbers.
• Use ultrasound repellents (e.g., Mouse Repellent) for up to 269 sq ft coverage.

Plug in this Mouse Repellent—it emits ultrasound waves unbearable to mice and cockroaches, driving them away.

Eliminating an Established Population

Cats are "very ineffective," says Vantassel. Use snap traps baited with peanut butter (smooth indoors, crunchy outdoors) or caramel. Cheese is lower on the list. Place traps along walls near warm spots—water heaters, gas stoves, hot-water pipes—with bait side toward wall. In attached garages, set traps along the warm wall next to the house. Wear gloves to remove dead mice; dispose in sealed plastic bag. Reusing traps is fine.

Outdoor Mouse Magic

Indoor Mouse Magic

Keep Them Out Long-Term

Once mice are gone, check for openings regularly and keep food sources secure. Good housekeeping and repellents help. Mouse Magic (peppermint/spearmint oils) smells like potpourri to humans—"mice just really hate it," says Jim Wurz of Bonide. Sachets last ~1 month; place behind appliances, under sinks. Use indoors, outdoors, in campers, boats, trailers. All-natural, biodegradable.

Toxic baits are a last resort—use with extreme caution, out of reach of children, pets, wildlife. Start with snap traps; be aggressive: use a dozen or more. "A mouse is an incredible critter," Vantassel says, "but they don't belong in the house."