Eliminate Mice in Your Attic: Complete Removal & Prevention

The core issue: mice enter through gaps as small as a dime and breed rapidly in attics because it's warm, dark, and full of insulation to nest in. You need three simultaneous strategies: trapping now, sealing entry points, and removing attractants.

Phase 1: Immediate Trapping (Days 1-7)

1. Set snap traps or electronic traps along walls where you see droppings or hear activity — mice run along edges, not across open space.
2. Bait with peanut butter or nesting material (cotton balls) — they're more attracted to nest-building materials than food in attics.
3. Check traps daily. Dispose of mice in sealed bags in outdoor trash.
4. Expect 5-15 mice depending on infestation severity; reset traps until you catch nothing for 3 consecutive nights.

Phase 2: Seal Entry Points (Days 3-14)

1. Inspect exterior for gaps larger than 0.5 inches — check roof edges, soffit vents, chimney gaps, foundation cracks, and where utilities enter.
2. Fill gaps under 0.5 inches with steel wool or caulk; larger gaps need hardware cloth stapled over them.
3. Replace damaged soffit vents with rodent-proof caps.
4. This is essential — if you don't seal, new mice will enter within weeks.

Phase 3: Remove Nesting Sites (Days 7-21)

1. Remove or isolate loose insulation, cardboard boxes, and stored fabrics — these are prime nesting material.
2. Seal stored items in plastic containers instead of cardboard.
3. Clean attic thoroughly with HEPA vacuum (wear a mask — mouse droppings carry hantavirus).

When to Call a Professional

If you catch 20+ mice, see significant structural damage, or feel unsafe in the attic, hire a licensed pest control service. They can confirm entry points you missed and remove contamination properly.

Pro tip: Electronic traps (CO₂ or spring-loaded) are faster and more humane than snap traps, and they're easier to use without risk of finger injury. Set them perpendicular to walls, not parallel — mice approach walls head-on and will trigger the trap entering, not exiting.