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Blog · October 2026
Why are there mice in my garage?
The garage is the easiest room in the house for a mouse. The big door rarely seals all the way, the shelves hold seed, pet food and cardboard, and nobody looks behind the freezer. Here is what draws them in and how to close it up.
- Bird seed and pet food
- Cardboard and holiday boxes
- The big door
- The door into the house
Found droppings already? Skip to sealing the garage door.
Start here
Why are mice in my garage, and how do I keep them out?
Mice move into garages because they are easy to enter and full of food and nesting spots. A mouse can fit through a hole about 1/4 inch across, according to the CDC, and the rubber or vinyl strip on the bottom of a garage door is the kind of material University of Nebraska-Lincoln Extension calls easy for rodents to gnaw through. Inside, they find bird seed, pet food, cardboard to shred and appliances that run all day, which UNL Extension lists as favored den sites. A garage colony also sits right next to your kitchen. To fix it, move food into metal or thick plastic bins, get boxes off the floor, close the gaps under and beside the big door, and make the door into the house seal tight.
What draws them
What brings mice into a garage in the first place
A garage holds food, shelter and warmth, often all on the same shelf.
Seed and feed
Bird seed, grass seed and deer corn in paper or plastic sacks. The CDC says to store grains and animal feed in thick plastic or metal containers with tight lids.
Pet food
A big bag of dog food on the floor feeds a mouse all winter. UNL Extension says to keep pet food in tight-fitting bins.
Cardboard
Mice gnaw cardboard and leave clean holes about 1 1/2 inches wide, per UNL Extension. Shredded paper is their favorite nest material.
The freezer or second fridge
UNL Extension lists appliances that run constantly, like refrigerators and water heaters, as favored den sites.
Floor clutter
UNL Extension notes mice live in debris piles and stored items that rarely move.
The car
A parked car is warm and quiet. Chewed wiring is its own problem, covered in our car wiring guide.
What they ruin
What mice get into once they are in the garage
Anything soft, papery or edible on the floor is fair game.
| Item | What usually happens | Better way to store it |
|---|---|---|
| Bird seed and pet food | Bags chewed open, food spread and cached in other spots | Metal can or thick plastic bin with a tight lid |
| Holiday and keepsake boxes | Corners chewed, paper and fabric shredded for nests | Hard plastic totes with snap lids, up on shelves |
| Camping gear and sleeping bags | Stuffing pulled out for nests, droppings inside | Sealed totes, or stored inside the house |
| Freezer and fridge | Nests under or behind the unit near the warm motor | Pull it out twice a year, vacuum and look |
Mice also cache food when they can, according to UNL Extension, so finding seed inside a boot or a drawer is a classic sign. Our pantry and food storage guide covers which containers hold up and which do not.
The big door
Sealing the big door: bottom seal, corners and sides
If you can see daylight, a mouse can find the gap.
Do the daylight test
Close the door on a sunny day, turn off the lights and look for light. The National Park Service rodent manual uses this check and lists gaps under and to the sides of garage doors as entry points.
Check the bottom seal
Look for chewed, cracked or flattened rubber. UNL Extension notes rubber and vinyl weather stops are easy for rodents to gnaw through.
Look hard at the corners
On an uneven slab the seal often fails at the corners. A gap there the size of a pencil is enough for a mouse.
Close the sides
Check the weatherstrip along each side of the door. Light at the edge of the door is a gap a mouse can use.
Fix the threshold
If the slab is cracked or sloped, the door cannot seal no matter how new the rubber is. A threshold strip or slab repair fixes that.
Seal the small holes too
Pipes, wires and vents that pass through garage walls. The CDC says to seal outbuildings and garages, using steel wool with caulk for small holes and metal for larger ones.
UNL Extension says doors should leave less than 1/4 inch between the bottom and the threshold. For the full sealing method, see our exclusion page.
Door to the house
The door from the garage into the house
Treat it like an outside door, because for a mouse it is.
The door between the garage and the kitchen is the last line, and it is often the weakest one because nobody thinks of it as an outside door.
UNL Extension suggests metal flashing on the lower edge of doors, especially softwood doors, and mechanical closers so doors are not left propped open. A door that closes on its own and seals at the bottom keeps garage mice in the garage while you deal with them.
- Close the door and look for light at the bottom
- Check the sweep for chew marks or tears
- Look at the corners where the jamb meets the floor
- Check where pipes or wires pass from garage to house
- Make sure the door latches on its own
- Set traps on the garage side, not the kitchen side
Garage mice
Mice in the garage and worried about the house?
Call or send the form. We find the entry points, seal them with metal and trap what is inside, then confirm with a full quiet week. The price is in writing before any work starts.
Holiday boxes
Before the holiday boxes come into the house
Check them where they are stored, not where they are going.
Late fall is when decorations come down from garage shelves and go straight into the living room. UNL Extension notes rodents can even be carried into a building inside a box.
Open boxes in the garage first, in good light, with gloves on. If you find droppings or shredded nest material, do not shake it out or sweep it. Our droppings cleanup guide has the safe way, and what to throw away covers keep or toss.
- Open boxes in the garage, not the living room
- Look for droppings, chewed corners and shredded paper
- Move decorations from cardboard into hard totes
- Put totes on shelves, off the floor
- Set a few snap traps along the garage wall
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Straight answers
Garage mouse questions
Why do I have mice in my garage but not in the house?
The garage is easier to get into and usually has the food and cover. Keep the door into the house sealed and deal with the garage before they try the next room.
Will mice in the garage get into the house?
They can. A mouse seldom goes more than about 50 feet from its nest, according to UNL Extension, and in most homes the kitchen is within that range of the garage. Pipes, wires and the door into the house are the usual routes.
Is it safe to keep bird seed and dog food in the garage?
Yes, if it is in a metal can or a thick plastic bin with a tight lid. The CDC recommends thick plastic or metal containers with tight lids for grains and animal feed. The paper or plastic bag it comes in is not enough.
Why do mice like the space behind the garage freezer?
It is warm, dark and rarely disturbed. UNL Extension lists appliances that run all the time, like refrigerators, as favored den sites. Pull the unit out and look behind it at least twice a year.
Where should I put traps in the garage?
Along the walls, behind stored items and near any chewed bags, with the baited end against the wall. UC IPM suggests traps no more than about 10 feet apart where mice are active. Mice move mostly at night; see when mice and rats are most active.
Do you work on garages?
Yes. We find the entry points, seal them with metal, trap what is inside and confirm with a full quiet week with no new catches and no fresh droppings. Call (662) 208-6880, answered 24/7.
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Sources
Last reviewed October 2026 by the Rodent Control Oxford team. Biology and control standards follow Mississippi State University Extension and the CDC. Price ranges are labeled benchmarks; your price comes in writing after we inspect.
Oxford & Lafayette County
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