Winter in Maryland and Pennsylvania can bring more than just chilly weather and snow. It often also brings an uptick in mouse activity inside homes. As the weather turns frigid, mice seek warmth, food, and shelter. Understanding their behavior and taking targeted prevention steps can protect your home from unwanted furry guests this season.

Why Mice Enter Homes in Winter

As temperatures drop, mice look for cozy environments with easy access to food and water. Your home’s insulation provides necessary warmth inside attics, wall voids, basements, and crawl spaces. Additionally, homes provide endless supplies of crumbs on counters, pet food left out, stored pantry goods and more. With the ability to fit through holes as small as a dime, mice are experts at exploiting gaps around utility lines, vents, and foundations, making it simple for them to access all the warmth and food your home has to offer.

In Maryland and Pennsylvania, where winter freezes can be prolonged and severe, these conditions make homes particularly attractive to mice in late fall through early spring.

Signs of Mouse Activity

Watch for these common indicators:

• Droppings: Small, dark pellets near food packaging, cupboards, or along walls.
• Gnaw marks: Chew marks on baseboards, wires, boxes, and furniture.
• Scratching sounds: Especially at night in walls, attics, or ceilings.
• Nests: Shredded paper, fabric, or insulation used to create nesting sites.
• Smells: A strong, musky odor in hidden spaces can signal a large infestation.

Catching signs early makes prevention and removal much easier.

Prevention Tips for Homeowners

Seal Entry Points

Mice can squeeze through tiny openings. Inspect your home’s exterior and seal:

• Gaps around pipes and wiring
• Cracks in foundation and walls
• Vents and attic openings
• Spaces under doors

Use steel wool, caulk, and metal mesh — mice can chew through foam and rubber, but not steel.

Eliminate Food Sources

Reduce attractants by:

• Storing dry food in airtight metal or glass containers
• Cleaning up crumbs and spills daily
• Avoiding leaving pet food out overnight
• Keeping garbage sealed and taken out regularly
• Cleaning kitchen appliances and pantry shelves

Declutter & Sanitize

Mice love hidden places. Reduce clutter where they can nest:

• Clear storage boxes in basements and attics
• Avoid stacking cardboard; use plastic bins
• Reduce piles of laundry or fabric on floors

Regular sweeping and vacuuming also remove food particles mice love.

Set Traps Strategically

If you suspect activity:

• Use snap traps or humane live traps
• Place them perpendicular to walls where mice travel
• Bait with peanut butter or chocolate
• Check traps daily

It’s best to avoid poison if pets or children are present.

Maintain Yard & Exterior

Outside your home:

• Trim vegetation away from the house
• Store firewood away from structures
• Keep compost bins sealed
• Elevate bird feeders (seeds attract mice too)

When to Call a Professional

If you notice:

• Persistent signs despite prevention efforts
• Multiple mice caught in traps
• Damage to wiring or insulation

A pest control professional like On The Fly Pest Solutions can assess your situation and treat effectively. If you find yourself with a mouse infestation this winter, give us a call and we’ll take care of it!