The most effective way to keep chipmunks away from your house is to remove what attracts them in the first place: food, shelter, and easy access to your foundation. Chipmunks are persistent, and no single tactic works perfectly on its own. A layered approach combining habitat cleanup, physical barriers, food source management, and strategic planting will give you the best results.
This matters more than you might think. Chipmunk burrows can extend up to 20 feet in length and reach three feet underground. When those tunnels run alongside your foundation, they can undermine retaining walls, porches, walkways, and the structural base of your home. Chipmunks that find their way inside through lower levels also chew wiring, which creates a real fire risk.
Clean Up Your Yard First
Chipmunks need cover. They’re small, they know it, and they stick close to anything that hides them from predators. The University of Georgia Cooperative Extension recommends habitat modification as the first step in any chipmunk control plan. That means removing wood piles, brush, rock piles, and leaf debris near your house. These serve as both hiding spots and potential nesting sites.
Ground cover plants are a big draw too. English ivy, in particular, provides shelter for chipmunks and other rodents. If ivy is creeping along your foundation or across garden beds near your home, removing it eliminates one of their favorite hiding spots. The same goes for dense, low-growing shrubs planted tight against the house. Pull landscaping back at least a foot or two from the foundation so chipmunks lose that protected corridor between your plants and your walls.
Block Entry Points With Hardware Cloth
Physical exclusion is the most reliable long-term defense. Hardware cloth with a half-inch mesh is the standard for keeping out chipmunks, rats, and squirrels. Anything larger and they’ll squeeze through.
The key areas to protect are gaps around your foundation, crawlspace vents, the undersides of decks, porches, and sheds. For structures with open bottoms, bury an L-shaped apron of welded wire along the perimeter. The horizontal foot of the “L” should extend outward underground, which stops chipmunks from digging under the barrier. Galvanized hardware cloth works well for most applications. If you’re burying it in consistently wet soil, stainless steel lasts longer.
Check for gaps around utility lines, dryer vents, and where pipes enter your foundation. Chipmunks only need a surprisingly small opening. Seal these with hardware cloth or steel wool backed by caulk.
Remove Food Sources Around Your Home
Bird feeders are one of the biggest chipmunk magnets. Fallen seed beneath a feeder is essentially a free buffet, and chipmunks will cache the leftovers in burrows near your house for later. If you’re dealing with a chipmunk problem, taking the feeder down temporarily is the fastest way to reduce activity around your home.
If you want to keep feeding birds, a few modifications help. Hang feeders on a wire strung between trees or mount them on a pole with a baffle, a smooth, cone-shaped guard that prevents climbing. You can make a simple baffle by threading empty one-liter soda bottles onto the wire on either side of the feeder, or sliding two-foot sections of plastic pipe over it. Use feeders designed to catch fallen seed, and clean up any spillage promptly.
One practical guideline: birds can find plenty of natural food from April through November, so consider offering seed only during the colder months. If spring arrives early with warm weather and melted snow, take the feeder down early. Beyond bird feeders, keep pet food indoors, pick up fallen fruit from trees, and store garden harvests quickly.
Capsaicin-Treated Seed Does Not Work on Chipmunks
You may have heard that adding hot pepper to birdseed deters rodents while birds eat happily. Birds lack the receptors that make capsaicin burn, so in theory it’s a clean solution. Research at the University of Nebraska tested sunflower seed treated with capsaicin at 40,000 Scoville Heat Units on the shell. The treated seed successfully deterred squirrels in some contexts, but it was not effective at deterring eastern chipmunks from taking the seed. So don’t rely on spicy birdseed as your chipmunk strategy.
Plants That Chipmunks Avoid
Strategic planting won’t build an impenetrable wall, but it can make the perimeter of your house less inviting. Chipmunks have sensitive noses and tend to avoid plants with strong fragrances or irritating oils. Planting these near your foundation, around patios, and along garden borders adds a passive layer of deterrence.
- Mint produces a strong aroma chipmunks dislike. Plant it in pots near vulnerable areas, since mint spreads aggressively in the ground.
- Alliums including garlic, chives, and ornamental onions emit sulfur-based scents that repel chipmunks.
- Daffodils produce toxic compounds in their bulbs that chipmunks find unpalatable. Unlike tulip bulbs, which chipmunks love to dig up, daffodils are left alone.
- Lavender thrives in sunny, well-drained spots and has a fragrance chipmunks avoid.
- Marigolds have an especially pungent scent that rodents tend to steer clear of.
- Thyme and sage contain oils that irritate chipmunks’ respiratory systems. Low-growing clumps of these herbs work well as ground-level deterrents.
- Stonecrops and sedums have thick, spiky leaves that discourage digging near structures. Their dense texture also makes poor nesting cover.
- Geraniums emit a strong fragrance that chipmunks’ sensitive noses can’t tolerate.
Planting a border of these species around your foundation or garden beds creates an environment chipmunks would rather avoid. Combining aromatic herbs like thyme and sage with structural plants like sedums covers both scent and texture deterrence.
Skip the Ultrasonic Devices
Ultrasonic pest repellers are widely marketed, but the science behind them is, as McGill University researchers put it, “ultra-shaky.” Studies show that animals either habituate to the noise quickly or simply aren’t bothered by it. Laboratory experiments using high-grade ultrasound generators have disrupted mating and eating habits in certain species, but those generators are far more powerful and sophisticated than anything sold for home use. Consumer-grade devices can’t replicate the complicated sound patterns needed and turn out to be essentially useless. The studies on commercial products are also limited and typically lack proper controls, so even when pest activity happens to decrease, there’s no way to confirm the device caused it.
Trapping and Legal Considerations
If prevention alone isn’t enough, live trapping is an option, but it comes with important caveats. Wildlife regulations vary significantly by state and even by municipality. In Missouri, for example, property owners can trap damage-causing wildlife without a permit, but must report the take within 24 hours and follow specific disposal instructions. Many states have similar provisions, but the details differ.
Relocation sounds humane but is generally discouraged by wildlife agencies. A relocated chipmunk doesn’t know where to find food or shelter, faces hostility from established local populations, and may spread disease to new areas. Most federal, state, and local agencies prohibit releasing wildlife on public lands they manage. For these reasons, conservation departments typically recommend euthanasia over relocation, even though it’s a less comfortable option emotionally. Check your local wildlife agency’s guidelines before setting any traps, and verify whether your city or county has restrictions on trap types.
Putting It All Together
Chipmunk control works best as a system. Start by removing the things that attract them: clean up debris, pull back dense plantings from the foundation, and manage bird feeders and outdoor food. Then add physical barriers with half-inch hardware cloth at every entry point, buried in an L-shape where digging is a concern. Layer in aromatic and textured plantings around your home’s perimeter. These steps, done together, make your property genuinely less hospitable rather than relying on any single gimmick.
The signs that chipmunks are already established include small, clean two-inch diameter holes near foundations or retaining walls (chipmunks don’t leave dirt mounds at their entrances like moles do), chew marks on wiring or wood, and the telltale chattering calls from your deck or porch area. If you’re seeing foundation damage or finding chewed wires, that’s a signal to act quickly rather than wait for deterrent plants to mature.