The most effective way to get rid of chipmunks combines removing what attracts them with physical barriers that keep them out. No single method works alone. Chipmunks are persistent, territorial rodents whose burrows can stretch 20 to 30 feet underground, so a layered approach using habitat changes, exclusion, trapping, and repellents will give you the best results.
Why Chipmunks Are Worth Dealing With
Chipmunks look harmless, but their underground tunnel systems can cause real structural problems. Burrows undermine the soil supporting your foundation, leading to uneven settling and cracks in foundation walls and floors over time. The tunnels also act as channels for rainwater, washing away even more soil and creating pathways for water to seep into your basement. That water intrusion brings mold, wood rot, and humidity damage.
Above ground, chipmunks eat flower bulbs, seeds, seedlings, grass seed, pet food, and birdseed. If you’re finding small round holes about 2 to 3 inches wide near your foundation, piles of displaced dirt nearby, or new cracks forming in your foundation walls, you’re looking at active chipmunk damage.
Start With Habitat Modification
Before reaching for traps or repellents, make your yard less appealing. The University of Georgia Cooperative Extension recommends habitat modification as the first step in chipmunk control, and it’s the one with the longest-lasting payoff.
Chipmunks thrive where they find food and cover together. Bird feeders are one of the biggest attractants. Spilled birdseed on the ground is essentially a buffet. Switch to a feeder with a tray that catches seed, or remove feeders entirely during peak chipmunk season (spring through fall). Store pet food indoors. If you’ve spread grass seed, cover it with straw or netting until it germinates.
Reduce ground cover near your home’s foundation. Dense shrubs, rock walls, wood piles, and thick ground-cover plantings all provide the shelter chipmunks need to feel safe enough to burrow. Pull plantings back from the foundation, stack firewood away from the house, and clear debris. Chipmunks prefer edges where forest meets open space, and a cluttered yard mimics exactly that environment. A cleaner perimeter won’t eliminate chipmunks entirely, but it makes your property far less attractive compared to neighboring habitat.
Block Entry With Hardware Cloth
Physical exclusion is the most reliable long-term fix. Quarter-inch galvanized hardware cloth is the standard material. The mesh openings are small enough that chipmunks can’t squeeze through, and the galvanized coating resists rust underground.
To protect gardens or foundation perimeters, bury the hardware cloth 6 to 12 inches deep and extend it 2.5 to 3 feet above ground. For sealing openings into buildings like gaps around pipes, vents, or crawl space entries, use the same quarter-inch hardware cloth secured with screws or staples. Regular window screen or chicken wire won’t work. Chipmunks can chew through lightweight materials, and chicken wire has openings large enough for them to pass through.
Pay special attention to areas where utility lines enter your home, dryer vents at ground level, and any gaps where siding meets the foundation. A chipmunk only needs a hole about 2 inches wide to get inside.
Trapping Chipmunks Effectively
Live-catch wire mesh traps are the most common option for homeowners. Peanut butter is the go-to bait, but you can also use sunflower seeds, pumpkin seeds, raisins, or pieces of prune. The key to success is pre-baiting: wire the trap doors open for 2 to 3 days so the chipmunk gets used to the metal object and starts feeding freely inside it. Once you see the bait disappearing regularly, set the trap to close.
Place traps along walls, fences, or near burrow entrances where you’ve seen chipmunk activity. Chipmunks run along edges rather than crossing open ground, so a trap in the middle of your yard will sit untouched.
Check Local Laws Before Relocating
This is where many people run into trouble. In several states, it is illegal to relocate a trapped animal off your property. New York, for example, explicitly prohibits releasing a live-trapped animal in a park, on state land, or anywhere other than where it was caught. The reasoning is that relocation spreads diseases like rabies and Lyme, stresses the animal, and creates problems for neighboring properties. Many states require you to either release the animal on site or contact a licensed nuisance wildlife control operator. Before trapping, check your state’s wildlife agency website for the rules that apply where you live.
Scent and Taste Repellents
Repellents can help discourage chipmunks from specific areas, but they work best as one layer in a broader strategy rather than a standalone solution. The most commonly used options include peppermint oil, hot pepper (capsaicin), white vinegar, and garlic.
For peppermint oil, mix several drops into a spray bottle of water and apply around burrow entrances, garden borders, or foundation edges. You can also soak cotton balls and place them in problem areas. For vinegar, mix equal parts white vinegar and water and spray it directly on active chipmunk routes. Capsaicin-based sprays, available at most garden centers, make treated plants and seeds taste unpleasant enough to deter feeding.
The main limitation of all repellents is duration. Rain washes them away, and the scent fades within days. You’ll need to reapply every few days and after any rainfall. If you stop reapplying, chipmunks return quickly. Repellents work best for protecting a specific garden bed or keeping chipmunks away from a particular entry point while you install a more permanent barrier.
Skip Ultrasonic Devices
Ultrasonic pest repellers are widely marketed but have never been proven to work in real-world conditions. While laboratory studies have shown that high-powered ultrasound can disrupt rodent behavior, the consumer-grade devices sold for home use can’t replicate those conditions. They produce far simpler sound patterns at lower power. Researchers at McGill University found that commercially available devices lack credible evidence of effectiveness, and some animals simply habituate to the noise over time. Save your money for hardware cloth and traps.
Putting It All Together
The most practical approach follows a specific order. Start by cutting off food sources and clearing ground cover, especially within 10 to 15 feet of your foundation. Install quarter-inch hardware cloth around vulnerable areas like gardens, crawl spaces, and foundation gaps. Set pre-baited live traps along active travel routes. Use scent repellents on areas you can’t easily fence off, and commit to reapplying them regularly.
If you’re dealing with a large population or burrows are already undermining your foundation, a licensed wildlife control operator can assess the extent of the tunnel system and handle removal within your state’s legal requirements. Foundation damage from extensive burrowing may also warrant an inspection from a structural professional, particularly if you’re noticing new cracks or water in your basement.