Chipmunks are a common sight in North American backyards, their quick movements and chattering calls adding a touch of wildlife to the daily routine. While their antics can be entertaining, a population that grows unchecked leads to significant damage in gardens and around structures. Understanding how to control chipmunks requires a shift from simple elimination to a strategy focused on modifying the environment and making your property less appealing.
Understanding the Chipmunk Challenge
Effective control begins with recognizing why these animals are on your property. Chipmunks are primarily herbivores, feeding on seeds, nuts, fruits, and insects, but they will opportunistically eat pet food or garden vegetables. They dig extensive burrow systems with multiple entrances, often located under sheds, decks, or near foundation walls. These tunnels can undermine concrete slabs and damage plant roots, making the goal of control less about trapping every individual and and more about managing the habitat that supports them.
Modifying the Landscape
Altering the environment is the most sustainable method for long-term chipmunk management. By removing the resources that attract them, you reduce the likelihood of them establishing a permanent residence on your land.
Remove Food Sources
Secure bird feeders with trays or use models designed to exclude chipmunks.
Pick up fallen fruit and nuts from trees promptly.
Store pet food indoors or in metal containers with tight-fitting lids.
Keep garbage in tightly sealed bins.
Trim Vegetation
Chipmunks rely on ground cover and brush piles for safety from predators. Mowing down tall grass, weeds, and low-hanging shrubbery removes their protective camouflage. Clearing wood piles, rock piles, and dense ground cover eliminates potential shelter and reduces the number of safe travel routes across your yard.
Exclusion and Structural Barriers
Preventing chipmunks from entering structures is often more effective than trying to trap them once they are inside. They are adept climbers and diggers, so barriers must be robust.
To protect gardens, install a wire mesh fence around the perimeter. The mesh should be buried at least 6 to 12 inches underground or extended outward in an "L" shape to prevent them from burrowing underneath. Use hardware cloth with holes no larger than half an inch to keep them out. Seal gaps larger than a quarter inch around the foundation, utility lines, and roof eaves to deny access to attics and crawl spaces where they might nest.
Humane Trapping Methods
When exclusion is not enough, live trapping is the most humane option for removal. Choose a cage trap that is specifically designed for small animals, ensuring it is the appropriate size to contain a chipmunk comfortably. The key to success is bait selection and placement.
Peanut butter, sunflower seeds, or oats are highly effective baits. Position the trap along the pathways the chipmunks frequently use, placing the bait deep inside the trap to ensure the animal fully enters and triggers the door. Check the trap frequently—at least once a day—to minimize stress on the captured animal. Relocate the chipmunks at least five miles away from your property to prevent them from returning.
Repellents and Deterrents
For those looking for a non-lethal deterrent, certain smells are offensive to chipmunks and can encourage them to leave an area. Natural predators create a scent-based threat; predator urine (such as coyote or fox) can be scattered around the perimeter of the property to create a false sense of danger. Additionally, hot pepper sprays applied to garden beds can deter feeding. While these methods require reapplication, especially after rain, they are valuable tools in a comprehensive strategy that avoids direct harm to the animals.
