Signs of a Mouse Infestation People Ignore

February 9th, 2026

In February, mice are still very active. They don’t “disappear” in winter — they simply move into warm, accessible areas, often leading to expensive damage. The problem is that infestations usually start with subtle warning signs. When ignored, they can quickly turn into property damage, contamination, and persistent odors.

Here are the clearest signs to watch for — and what to do quickly.

1. Small nighttime noises (not always loud)

   One of the first warning signs is light scratching sounds inside:

   • walls,
   • ceilings,
   • vents,
   • or behind appliances.

   Mice are mostly active at night, so if the noise happens repeatedly in the same spot, it’s worth taking seriously.

2. Droppings in specific locations

   Mouse droppings are small, dark, and shaped like grains of rice. You’ll often find them:

   • in cupboards,
   • behind the stove or fridge,
   • in pantries,
   • along baseboards,
   • in basements.

   Even a few droppings usually mean more activity than you can see.

3. A strange, musky smell

   Mouse activity can produce odors that feel:

   • damp,
   • musty,
   • sometimes ammonia-like.

   In February, homes are less ventilated, so smells become more noticeable. If a room smells “off” for no clear reason, it may be a warning sign.

4. Chewed packaging or unusual crumbs

   Mice don’t eat much at once, but they chew constantly. Watch for:

   • flour bags,
   • cereal boxes,
   • snack bars,
   • even pet food.

   Small holes or bite marks are not accidental.

5. Chewed wires: the real danger

   This is often the most expensive issue. Mice can chew:

   • electrical wiring,
   • insulation,
   • protective sheathing,
   • plastic components.

   That increases risks of power outages, short circuits, and even fire hazards. A mouse in your walls can become a serious safety issue.

6. Common mistakes that make things worse

   • Setting one trap and assuming it’s done.
   • Cleaning droppings without fixing the cause.
   • Sealing holes with tape or paper.
   • Waiting to “see if it comes back.”

   If one mouse got in, there is almost always an entry point.

7. The best solution: identify entry points and secure them

   Effective pest control includes:

   • locating the entry points,
   • sealing them with proper materials,
   • eliminating current activity,
   • reducing food sources.

In conclusion, in February, one small sign may hide a major problem. Acting early prevents expensive repairs and unwanted surprises.