Maryland is home to two vole species: the meadow vole and the pine vole. These small rodents, sometimes called meadow mice, are among the most common landscape pests in the state. They look similar to mice but behave quite differently, and the damage they cause to lawns, gardens, and tree roots can be surprisingly severe for animals that rarely live longer than 16 months.
Two Species, Two Habits
Meadow voles and pine voles share Maryland’s landscape but occupy different niches. Meadow voles are surface dwellers. They build networks of narrow runways through grass and ground cover, feeding on the stems and bark of plants at or just above ground level. Their damage tends to show up at the base of plants and fruit trees, where they gnaw bark in a characteristic pattern.
Pine voles operate underground. They tunnel through soil and attack plants from below, chewing through root systems entirely. A plant that looks perfectly healthy one day can topple over a few days later with its roots gnawed off. Pine voles will also exploit existing mole tunnels, chewing golf ball-sized exit holes to move between the surface and underground networks.
Both species are stocky, with short tails, small ears, and blunt noses. They’re frequently confused with moles, but the distinction matters: moles eat insects and grubs, while voles are strict vegetarians that feed on roots, bark, bulbs, and turf. Voles also spend far more time above ground than moles do.
How Vole Populations Explode
Voles breed from late winter through August. A single female can produce six litters per year, with four to eight pups per litter. The gestation period is only about 21 days, and those young reach reproductive maturity quickly. This means a small colony can balloon into hundreds of individuals over a single growing season. Meadow voles live in colonies ranging from a handful to 300 individuals, all connected by the crisscrossing runway systems they build through grass and mulch. Despite their numbers, individual voles are short-lived, typically surviving just two to 16 months.
Recognizing Vole Damage
The signs depend on which species you’re dealing with. Meadow vole damage is visible at ground level. Look for narrow, well-worn paths about two inches wide running through your lawn, especially where grass is tall or mulch is thick. At the base of young trees and shrubs, you may notice bark stripped away in clean, parallel grooves. Those grooves are about a quarter inch wide, left side by side by the vole’s front teeth. In winter, when other food is scarce, this bark feeding intensifies and can girdle and kill small trees.
Pine vole damage is harder to spot because it happens underground. The first sign is often a plant that wilts or dies for no apparent reason. When you pull it up, the root system is gone or severely chewed. Perennials, bulbs, and the roots of fruit trees are common targets. If you notice golf ball-sized holes appearing in your lawn, particularly near existing mole tunnels, pine voles have likely moved in.
Reducing Vole Habitat
Voles rely on cover. They avoid open ground where hawks, owls, foxes, and snakes can spot them. The single most effective long-term strategy is removing the dense ground cover they depend on.
- Mow regularly. Keeping lawn grass short eliminates the overhead cover meadow voles need for their runway systems.
- Pull back mulch. Clear mulch to a three-foot radius around the base of trees and away from flowerbeds. Thick mulch is prime vole habitat.
- Remove thatch and leaf litter. Accumulated organic debris on turf creates the sheltered conditions voles prefer.
- Clean up ground cover plants. Dense, low-growing plantings near vulnerable trees or garden beds give voles easy, protected access.
These changes won’t eliminate voles entirely, but they make your yard far less attractive and force voles into areas where predators keep populations in check naturally.
Protecting Trees and Garden Beds
For high-value plants, physical barriers are the most reliable defense. Quarter-inch hardware cloth is the right mesh size. Openings any larger and voles can squeeze through. Wrap the trunks of young fruit trees with cylinders of hardware cloth, burying the bottom edge several inches into the soil so pine voles can’t tunnel underneath. The cylinder should extend high enough above ground to stay above typical snow depth, since meadow voles will feed on bark at snow level during winter.
For raised garden beds, lining the bottom with quarter-inch hardware cloth before filling with soil blocks pine voles from tunneling up into the bed from below. This is especially useful for protecting bulbs, root vegetables, and perennial roots.
Trapping Voles Effectively
Standard mouse snap traps work well for voles, but placement matters more than bait. Set traps perpendicular to an active runway with the trigger end sitting directly in the path. Voles travel their runways repeatedly and will hit the trigger naturally. You can bait with peanut butter, apple slices, or seeds, but unbaited traps set in active runways catch voles just as reliably.
Cover each trap with a board, shingle, or an overturned box to increase your catch rate. Voles feel safer under cover and are more likely to investigate. The covering also keeps birds, squirrels, and pets away from the traps. If you use a box, cut two one-inch holes on opposite sides so voles can enter from either direction along the runway, and make sure the box doesn’t interfere with the trap’s spring action. A simple one-foot square of asphalt roofing shingle laid over the trap works equally well.
To figure out where voles are most active before you start trapping, place apple slices under overturned boxes or shingles along suspected runways. Check them after a day or two. Spots where the apples disappear are your best trap locations.
For large infestations, you may need a dozen or more traps running simultaneously. Given how quickly voles reproduce, a few traps in one corner of the yard won’t keep pace with a colony producing new litters every three weeks through the breeding season.