Mice can enter through openings as small as a dime, making even tiny gaps a real risk during cooler seasons. Inspect the areas around utility lines, siding transitions, basement windows, door sweeps, and foundation seams — these are some of the most common entry points.
Freeze–thaw cycles can widen small cracks, and rodents take advantage quickly. Sealing these gaps early, combined with proper monitoring inside, helps prevent unwanted guests before they settle in.
