Hearing scratching and scurrying behind your drywall at dawn is unsettling, and a chipmunk that has slipped into a wall cavity rarely leaves on its own. Knowing how to get rid of chipmunks in walls comes down to three things done in the right order: finding and respecting how the animal moves, removing what drew it in, and sealing the building so it cannot return. Rush to plug a hole while a chipmunk is still inside and you create a far worse problem, an animal that dies in the cavity and rots. Done patiently, most homeowners can solve this without poison and without harming the animal.
Confirm It Is Actually a Chipmunk
Before you act, identify the intruder. Chipmunks are small, striped ground squirrels active during daylight, especially early morning and late afternoon. Mice are quieter and mostly nocturnal, and rats are larger with heavier thumping. Chipmunk activity in a wall usually sounds like quick scratching, brief running, and the occasional sharp chirp. Look for the entry point along the foundation, weep holes, gaps where utility lines enter, or under deck and porch framing. Chipmunks are excellent climbers but prefer ground-level access, so start low.
Never Seal a Live Animal Inside
This is the single most important rule. If you wall up a chipmunk, it will die where you cannot reach it, leaving an odor that can last weeks and attract flies. Instead, give the animal a way out before you close anything. A reliable method is the one-way exclusion door, a small spring or flap device mounted over the entry hole that lets the chipmunk leave but blocks reentry. Watch the hole during daylight for a day or two to confirm activity, install the device, and leave it for several days before permanently sealing.
Remove the Attractants
Chipmunks come for food and shelter. Cut off the food supply and your home becomes far less appealing.
- Move bird feeders at least 15 feet from the house, or pause them while you deal with the problem. Spilled seed is the number one chipmunk magnet.
- Clean up fallen fruit, acorns, and nuts from trees near the foundation.
- Store pet food and grass seed in sealed metal containers, never open bags in the garage.
- Trim back shrubs, ground cover, and mulch piled against the siding, which give chipmunks cover to approach unseen.
- Clear leaf litter and woodpiles within a few feet of the wall.
Trapping Inside and Near the Wall
If exclusion alone is not moving the animal, live trapping is the most direct option. Small humane cage traps baited with peanut butter, sunflower seeds, or a slice of apple work well. Place the trap along the wall near the suspected entry, where chipmunks naturally travel. Check it at least every few hours, never leave a trapped animal in heat or sun, and relocate per your local wildlife rules. Many states regulate where and whether you can release trapped wildlife, so confirm before you drive off with a cage. Snap traps designed for chipmunks are effective but lethal, and they should be placed only where children and pets cannot reach them.
Deterrents That Actually Help
Deterrents work best as support, not as a standalone fix. Strong-smelling repellents containing capsaicin or predator scents can discourage chipmunks from a specific area for a short time, but rain washes them away and they need frequent reapplication. Ultrasonic devices have inconsistent, often disappointing results in real-world tests, so do not rely on them to clear a wall. The most dependable long-term deterrent is simply making the property less hospitable, less food, less cover, and a sealed envelope.
Seal Every Entry Point for Good
Once you are certain no animal remains inside, exclusion is what keeps the problem from repeating. Inspect the foundation, rim joist, vents, and any gap larger than about a quarter inch.
- Pack hardware cloth (quarter-inch galvanized mesh) into larger gaps, then seal around it. Chipmunks chew through foam and caulk alone.
- Cover crawlspace and foundation vents with metal screening.
- Install rodent-proof sweeps on garage and basement doors.
- Seal around pipes, cables, and dryer vents with mortar, metal flashing, or copper mesh embedded in sealant.
- Repair damaged soffits, fascia, and any rotted trim that gives easy access.
Understanding Chipmunk Behavior
Knowing how these animals operate makes every other step more effective. Chipmunks are solitary, territorial, and driven almost entirely by the seasonal need to gather and store food. They build extensive burrow systems but will readily exploit a wall cavity, soffit, or crawlspace that offers warmth and protection, especially as cold weather approaches in fall. They are most active in daylight and tend to follow the same routes repeatedly, which is exactly why placing traps and exclusion devices along their established travel lines works so well. They are also fast and cautious, so patience beats aggression. A chipmunk will not respond to a single loud noise or one application of repellent, it responds to a sustained change in how safe and food-rich your home feels. Work with these instincts rather than against them, and the animal will leave on its own far more often than you might expect.
When to Call a Professional
Some situations are beyond a weekend fix. Call a licensed wildlife control operator if you suspect a nest with young, if the animal has died inside a finished wall, if you hear activity but cannot locate the entry, or if the infestation involves more than one or two animals. Pros have cameras, exclusion materials, and odor remediation tools, and they know the local relocation laws. If a dead chipmunk is sealed in a cavity and you cannot remove it, professional removal and disinfection is worth the cost to avoid a lingering health and odor issue.
Keeping Them Out Long Term
The homes that stay chipmunk-free are the ones with a tight building envelope and a tidy perimeter. Walk your foundation each spring and fall, looking for new gaps, chewed openings, and burrow holes near the wall. Keep feeders and food sources well away from the structure, and address landscaping that creates a sheltered runway to your siding. Solving how to get rid of chipmunks in walls is really about prevention, because an animal that can never get in never needs to be trapped or excluded in the first place. A few hours of sealing and yard cleanup pays off far more than any repellent ever will.
