How to Keep Mice Out of Garage | Seal And Secure Every Entry

Keep mice out of a garage by sealing all entry points and removing food and nesting materials from the space.

The working fix for how to keep mice out of garage spaces is straightforward: block every possible entry, then remove what attracts them inside. Here’s the order that works.

Find Every Gap Mice Use To Get Inside

Before sealing anything, you need to find the openings. The most reliable method is to get down at mouse level and look for daylight coming through cracks along the walls, around windows, and where pipes and ductwork enter the structure.

The garage door bottom is the most common miss, so check it with the door closed and the interior lights off.

Seal The Openings With Durable Materials

Each gap type needs a specific material. Using the wrong one means mice chew through it and the work is wasted.

Small Cracks And Crevices

For gaps under a half-inch, pack steel wool or copper wool gauze into the opening first, then cover it with caulk or expanding spray foam. Mice can’t chew through metal wool, and the caulk holds it in place.

Vents And Pipe Gaps

Openings that need airflow require a physical barrier. Cut 1/4-inch hardware cloth to size and fasten it over vents and larger pipe gaps. Screening blocks mice while preserving airflow — foam alone in these spots fails fast.

Garage Door Gaps

The door bottom seal is the entry point mice use most. If the seal is worn, cracked, or leaves a visible gap, replace it with a new weatherstripping or door sweep.

A poorly adjusted door that doesn’t close flush leaves a persistent gap you can’t seal away — a metal threshold plate can also close the space between the door and the floor.

Remove The Food And Nesting Materials

Sealing only works if mice have no reason to try harder. Food and nesting material in the garage actively pull them in, so removal is half the job. The pest-control guidance from multiple sources is consistent on this point.

• Store pet food, birdseed, and other food in airtight glass or plastic containers — never in the original bags or open bowls.
• Replace cardboard storage boxes with plastic bins where possible; cardboard is both a food source and nest material.
• Clean up crumbs and spills quickly, and take trash out on a regular schedule instead of letting it accumulate.
• Declutter the space and keep items off the floor and on shelves so mice have fewer places to hide and nest.
• Address damp conditions with a dehumidifier; dry spaces are less inviting to rodents.

What To Avoid When Treating A Mouse Problem

For your specific situation, our tested roundup of mouse deterrents for garage use covers the products that actually hold up.