If you have found droppings in a drawer, heard scratching in the walls at night, or noticed a chewed corner on a cereal box, you already know you have mice. The harder question is usually: how are they even getting in? Most Nampa homeowners are surprised to learn the answer once they see it laid out.
A mouse can flatten its body and squeeze through an opening about the size of a dime, roughly a quarter inch. That is smaller than most people think, which is exactly why the entry point often goes unnoticed until the problem is already established.
1. Gaps Around Utility Lines
Anywhere a pipe, cable, or wire enters your home through an exterior wall, there is usually a small gap left behind from installation. These are common around dryer vents, AC lines, and where internet or electrical service enters the house. Over time, the sealant around these gaps shrinks or cracks, leaving just enough space for a mouse to squeeze through.
2. Garage Door Seals
The rubber seal along the bottom of a garage door wears down faster than most people expect, especially with regular use. A gap of even a quarter inch along the bottom corner is enough. Garages also tend to store food, pet food, and cardboard, which makes them an attractive first stop before mice move further into the house.
3. Foundation Vents and Crawl Space Openings
Older homes in Nampa neighborhoods with crawl spaces often have vent covers that have rusted, warped, or come loose over the years. These vents are a direct route into the space beneath your home, and from there mice can travel up through wall voids into living areas.
4. Gaps Around Window and Door Frames
Settling and seasonal temperature swings, which are common with Nampa’s dry summers and cold winters, cause wood and siding to expand and contract. This creates small gaps around window and door frames that widen slightly every year if not addressed.
5. Roofline and Soffit Gaps
Mice are surprisingly good climbers and can use tree branches, downspouts, or utility lines to reach the roof. Once there, gaps in the soffit, damaged fascia boards, or unscreened attic vents provide easy access to the attic.
6. Cracks in the Foundation
Even a small crack in a poured concrete foundation, especially around where the foundation meets the framing, can be an entry point. These cracks are more common in homes 15 years or older and tend to worsen with soil movement.
7. Doors Without a Sweep
A door without a proper sweep along the bottom, or one with a sweep that has worn down, leaves a gap along the threshold. This is one of the most common and most overlooked entry points, particularly on side doors and doors leading to the garage.
Why Sealing Alone Isn’t Always Enough
Once mice are already inside, simply sealing the exterior can trap them in your walls, which creates a bigger problem: an animal that cannot get back outside to find food and water. This is why a proper rodent program involves both trapping the mice that are already inside and identifying and sealing every entry point they used to get there.
Get a Full Exterior Inspection
Candor Pest Control performs a full exterior inspection to identify every likely entry point, not just the obvious ones, then combines trapping with exclusion work to make sure mice cannot come back through the same gaps next season. We serve Nampa and the surrounding Treasure Valley with rodent programs built for the way local homes are constructed.
If you are hearing scratching in the walls or finding droppings in your Nampa home, do not wait for the problem to grow. Call Candor Pest Control at 208-795-9710 or visit our Nampa pest control page to schedule a full inspection.
