In winter, rats move indoors for warmth and food; you’ll notice these telltale signs if they’re present in your home.

Key Signs of Rats in Winter

• Night noises: scratching, scurrying in walls/ceilings, mostly after 10pm.
• Droppings: dark, rice- to olive-sized (1/4–3/4 inch) along walls, in cabinets, near appliances.
• Grease rub marks: dirty smears along baseboards and hole edges from oily fur.
• Gnawing: fresh pale tooth marks on wood, plastic, wires; shredded insulation/paper for nests.
• Urine odor: musky, ammonia-like; small damp spots in enclosed rooms.
• Tracks: footprints and tail lines in dust or snow; sprinkle flour overnight to confirm.
• Burrows: 2–4 inch holes with smooth edges near foundations, sheds, under decks.
• Food evidence: chewed pet-food bags, seed caches, nutshell fragments; missing bird seed.
• Pet alerts: pets staring or pawing at walls and appliances.

Common Winter Hotspots

• Attics, crawlspaces, basements, garages, boiler/furnace rooms.
• Kitchen: under sink, behind fridge/stove, pantry, dishwasher cavity.
• Outside: compost, woodpiles, bird feeders, HVAC lines, foundation gaps.

Simple Same-Day Checks

• Do a quiet house walk at night; listen at walls and ceiling corners.
• Use a flashlight low to the floor; scan baseboards for smears and droppings.
• Place flour or talc strips by suspect gaps; check for tracks by morning.
• Stuff steel wool in 1/2-inch or larger gaps; recheck next day for fresh gnawing.

The fastest way: seal every hole rats use, remove food and clutter, place many snap traps along walls tonight, use tamper‑resistant bait stations only when needed (and safely), then clean and monitor until activity stops.

Seal Them Out (Exclusion)

• Inspect at dusk with a flashlight. Seal gaps 6 mm/¼ inch or larger around pipes, doors, and vents.
• Use steel wool or copper mesh packed tight, then seal over with caulk or foam; install metal kick plates.
• Add door sweeps; repair screens; cover vents with ¼‑inch hardware cloth.
• Outside: tighten trash lids, remove clutter, and trim vegetation 3 feet from the house.

Trap Effectively Indoors

• Use snap traps (quick‑kill). Avoid glue traps (cruel, messy).
• Place along walls and behind appliances where you see droppings or rub marks.
• Bait pea‑size with peanut butter, nut, or jerky; pre‑bait unset 1 night if rats are shy.
• Set perpendicular to walls; double up traps back‑to‑back; place every 6–8 feet.
• Wear gloves; check daily; bag and bin carcasses; reset until no catches for 2 weeks.

Use Rodenticide Safely (If Needed)

• Only in locked, tamper‑resistant stations; never loose bait.
• Place outdoors/perimeter or inaccessible areas; keep from kids, pets, wildlife.
• Follow the label; expect possible odor if rats die in walls.
• Reduce all other food sources or bait won’t be taken.

Clean Up and Monitor

• Wear gloves and a mask. Mist droppings/nests with disinfectant 10 minutes; wipe, double‑bag. Never dry‑sweep.
• Track activity with flour or sticky monitoring cards; reseal any new holes.
• Call a professional if activity persists after 7–10 days, you hear wall scratching, or safety risks exist (pets, wiring).