How to Get Rid of Mice in Your Garage: Complete Guide

Why Garages Attract Mice

Garages are usually the weakest link in home sealing — most have gaps under doors, unsealed siding, and less weatherproofing than living spaces. For mice, a garage offers:

• Shelter: Protected from weather and predators
• Food stores: Bird seed, pet food, grass seed, garbage
• Nesting material: Cardboard boxes, paper, fabric, insulation
• Bridge to the interior: Many garages connect to the house through a shared wall, door, or utility penetration

In fall, garages are often the first space mice enter when seeking winter shelter. They may nest there for weeks before moving into the house.

Signs of Mice in the Garage

• Droppings along walls: Especially behind stored items, under shelving, near pet food
• Chewed bags and boxes: Bird seed bags, cardboard storage boxes, grass seed
• Nests: Softball-sized clumps of shredded paper, fabric, or insulation in corners and behind stored items
• Gnaw marks on stored items: Holes in plastic containers, chewed packaging
• Pet food damage: Chewed bags, scattered kibble, droppings near pet food storage

Step 1: Remove Attractants

Mice come to your garage because you’re offering them food and shelter. Remove both.

Clear clutter:

• Remove cardboard boxes — replace with sealed plastic bins
• Eliminate piles of paper, fabric, or other soft materials
• Organize items off the floor where possible (shelves, hooks)

Secure food sources:

• Pet food: Store in rodent-proof containers (Gamma Vittles Vault or metal bins with tight lids)
• Bird seed: Same — metal or heavy plastic, tight lids
• Grass seed, fertilizer, and other bagged goods: Transfer to sealed bins
• Garbage: Use lidded cans only

Clear outdoor attractants near the garage:

• Move woodpiles and debris away from the garage exterior
• Trim vegetation touching the garage walls
• Clean up fallen fruit, spilled seed, or food waste

Step 2: Seal Garage Entry Points

Garage Door Gap (The #1 Entry Point)

Most garage doors don’t seal flush with the ground. Mice squeeze through gaps as small as ¼ inch.

• Install garage door weatherstripping — brush-style or rubber lip along the bottom
• Check the sides: Gaps between the door track and frame
• Check the top: Where the door meets the header when closed

Walls and Siding

• Pipe penetrations: Where water, gas, or electrical lines enter through garage walls
• Siding gaps: Especially near the foundation line
• Utility penetrations: Cable, phone, internet entries
• Holes in drywall or particle board: Even small ones

Sealing materials: Steel wool + silicone caulk, copper mesh, ¼-inch hardware cloth for larger gaps, foam + copper mesh for medium gaps (foam alone is insufficient).

Step 3: Set Traps

Placement:

• Along garage walls (mice run edges, not open spaces)
• Behind stored items against walls
• Near identified entry points
• Near any remaining food sources (pet food area)

How many: 4–8 snap traps for a typical 2-car garage. More for heavy activity.

Trap type: Snap traps are most effective. Electronic traps work well in garages where you want clean disposal.

Check daily. Non-negotiable.

Full trap comparison and placement guide →

Step 4: Prevent Winter Garage Entry

September and October are critical. Mice enter garages seeking winter shelter.

Before October 1:

• Seal all gaps in the garage (Step 2 above)
• Set monitoring traps (4–6, check monthly)
• Remove or secure all food sources
• Install garage door weatherstripping if missing

Ongoing:

• Keep garage organized and clutter-free
• Maintain monitoring traps year-round (check monthly)
• Do a fall inspection every year

Full winter proofing guide →

Garage-Specific Tips

Workbench and Tool Storage

• Drawers and cabinets near walls are nesting hotspots — check regularly
• Store tools in sealed containers or plastic bins
• Keep the area under workbenches clear of clutter

Vehicle Engine Bay

In cold weather, mice sometimes nest in vehicle engine bays for warmth. If you find droppings near your car:

• Pop the hood and inspect
• Check for nests near the battery, air filter housing, and engine block
• Clean nests before starting the vehicle (fire hazard from shredded material near belts)

Storage Rack Placement

• Pull racks 6+ inches from walls for visual inspection
• Don’t store items directly on the garage floor along walls
• Use sealed bins, not cardboard, for everything stored

Connection to House

• If there’s an interior door between the garage and house, ensure it’s sealed with weatherstripping and a threshold seal
• No gap should exceed ¼ inch
• Consider steel wool around the door frame if mice are entering the house from the garage

Frequently Asked Questions

Why do I have mice in my garage?

Because you’re offering them shelter and food. Garages have the weakest sealing in most homes, and items like bird seed, pet food, and cardboard boxes are highly attractive to mice. In fall, garages are the first stop for mice seeking winter shelter.

How do I mouse-proof my garage door?

Install weatherstripping along the bottom edge, seal gaps between the door track and frame, and check for gaps at the top. For persistent issues, add a brush-style door seal.

Can mice get from the garage into my house?

Yes. Mice commonly travel from garages into homes through shared walls, door gaps, utility penetrations, and even the garage-to-interior door. If you have mice in the garage, treat the garage and the house simultaneously.

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