If you’ve discovered narrow surface runways in your lawn, gnawed bark on young shrubs, or disappearing bulbs, voles may be the culprits. Often called “meadow mice,” voles are small rodents that feed on grasses, roots, bulbs, and the bark of young trees and shrubs. While they can be frustrating garden visitors, pesticides are rarely the best solution.
Instead, focus on making your landscape less attractive to voles. Keep grass and weeds trimmed, especially around trees, shrubs, and garden beds, since dense vegetation provides ideal cover. Remove brush piles, heavy mulch directly against trunks, and other places where voles can hide.
Protect valuable plants by installing wire mesh guards around the bases of young trees and shrubs. Hardware cloth with ¼-inch openings works well and should extend a few inches below the soil surface to prevent burrowing. For bulbs and vegetable gardens, consider planting in wire baskets or lined beds where vole damage is persistent.
Encouraging natural predators is another effective long-term strategy. Owls, hawks, snakes, foxes, and even some neighborhood cats help keep vole populations in check. Installing an owl nest box, when appropriate for your property, can support these beneficial predators while reducing the need for chemical controls.
Snap traps can also be used to reduce localized vole populations. Place traps perpendicular to active runways and cover them with an inverted box, bucket, or crate to protect children, pets, and non-target wildlife while allowing voles to enter.
Avoid rodenticides whenever possible. Poisoned rodents can be eaten by owls, hawks, foxes, bobcats, and other wildlife, causing illness or death through secondary poisoning. Protecting these natural predators is one of the most effective ways to maintain a healthy balance in your garden.
With a combination of habitat modification, plant protection, and support for natural predators, you can manage voles effectively while keeping your garden—and Marin’s wildlife—healthy.