Professional exterminators control voles using a combination of trapping, rodenticide baits, and habitat modification, often resolving infestations within a few weeks depending on the size of the affected area. If you’re seeing chewed-up plants, surface runways in your grass, or golf ball-sized holes in your yard, a pest control professional can identify the scope of the problem and deploy methods that aren’t available to homeowners.
How to Confirm You Have Voles
Before calling an exterminator, it helps to know what you’re dealing with. Voles look like stocky field mice with short tails, small eyes, and partially hidden ears, measuring 5 to 8 inches long. They’re vegetarians, feeding on plant roots, stems, flower bulbs, and bark. This is what separates them from moles, which eat insects and earthworms and leave volcano-shaped dirt mounds. Voles don’t create those mounds. Instead, they chew golf ball-sized exit holes in the ground, often repurposing abandoned mole tunnels.
The most obvious sign of a vole infestation is surface runways: worn-down paths about two inches wide running through thick grass or ground cover. Part the vegetation in your yard and look for these trails connecting small burrow openings. You may also notice plants that suddenly topple over because their roots have been gnawed off, or irregular tooth marks at the base of young trees and shrubs. Those marks are distinctive, with quarter-inch side-by-side grooves left by their prominent orange front teeth. In gardens, you’ll find eaten bulbs, clipped seedlings, and damaged vegetables.
What an Exterminator Actually Does
A professional vole treatment typically starts with an inspection to map active runways, locate burrow systems, and estimate population size. The exterminator then selects a strategy based on your property size, the severity of the infestation, and whether you have pets or children.
For smaller infestations (under an acre), trapping is a primary tool. Professionals use standard mouse snap traps placed perpendicular to vole runways, with the trigger sitting directly in the path. Two to three traps per runway or burrow opening is standard. Bait isn’t strictly necessary since voles running their usual routes trip the triggers, but peanut butter mixed with oatmeal improves catch rates. Multiple-catch traps are also effective, capturing several voles at once and requiring fewer total traps. These get placed near visible burrows with seed material at both entrance points. Traps that go untriggered for 48 hours get relocated to more active areas.
For larger properties or heavy infestations, exterminators turn to rodenticide baits. The most commonly used is zinc phosphide, a restricted-use pesticide that can only be applied by a licensed applicator. It kills voles in a single feeding, which makes it efficient, but it has a bitter taste. Professionals often pre-bait with untreated oats for two to three days so voles get comfortable eating from the stations before switching to the toxic formulation. Pellets are applied by hand directly into burrow openings and runways, or drilled into the ground to minimize exposure to non-target animals.
Anticoagulant baits are the other option. Warfarin, the only anticoagulant available for general use against voles, requires the animal to feed on it at least three times before it’s lethal. That means bait stations need consistent refilling, and professionals check them every other day during the early phase of treatment. Restricted-use anticoagulants like chlorophacinone work similarly but require a licensed applicator.
Fumigation with gas cartridges or aluminum phosphide tablets is technically possible but rarely recommended. Vole tunnel systems are complex and shallow, making fumigation time-consuming and largely ineffective.
Risks to Pets and Wildlife
Rodenticide baits are flavored with ingredients like fish oil, molasses, and peanut butter to attract voles, which also makes them appealing to dogs, cats, and children. All bait placements should be in tamper-resistant stations or placed inside burrows where non-target animals can’t reach them.
Secondary poisoning is a real concern. When a predator eats a poisoned vole, it can absorb the toxicant. Warfarin carries the lowest secondary poisoning risk for both birds and mammals. Chlorophacinone and bromadiolone pose high risks to mammals like dogs and cats. Brodifacoum and difethialone are particularly dangerous for raptors like hawks and owls. A good exterminator will discuss these tradeoffs with you and choose products appropriate for your situation, especially if you have outdoor pets or live near wooded areas with active wildlife.
Zinc phosphide, while lethal in a single dose, generally poses lower secondary poisoning risk because it breaks down quickly in the body. This is one reason it’s the most commonly used toxicant for vole control in professional settings.
How Long Treatment Takes
Vole control isn’t a one-visit fix. Trapping programs require regular checking, relocation of unproductive traps, and continued deployment until activity stops. Bait station programs need monitoring every other day initially to ensure adequate bait supply. Most professional programs involve an initial treatment followed by one or more follow-up visits to assess progress and adjust the approach.
The timeline depends heavily on population size. A small colony in a garden bed might be resolved in one to two weeks of active trapping. A widespread infestation across a large yard or orchard takes longer, potentially several weeks of sustained baiting and monitoring. Your exterminator should set expectations during the initial inspection.
Cost Factors
Professional vole control is priced based on property size and infestation severity, with most companies providing a customized quote after an initial inspection. Some pest control companies include voles under general pest management plans. Terminix, for example, covers interior voles under its PestFree365+ plan. Standalone vole treatments vary widely because the methods (trapping a small garden versus broadcast-baiting an orchard) differ so much in labor and materials. Expect to pay for the initial inspection and treatment, plus follow-up visits.
Preventing Voles From Coming Back
An exterminator can eliminate the current population, but voles reproduce quickly and will recolonize from surrounding areas if conditions remain favorable. Long-term prevention is where your investment really pays off.
Habitat modification is the foundation. Voles thrive in dense ground cover, tall grass, and heavy mulch because it hides them from predators. Keeping grass mowed short, pulling mulch back from tree bases, and clearing brush piles all reduce vole-friendly habitat. Mowing before any bait application also helps bait reach runways and burrows more effectively.
Physical exclusion is the most reliable protection for individual plants and trees. Wrap the base of young trees with hardware cloth or plastic cylinders using quarter-inch mesh or smaller. Bury the bottom edge at least 3 to 6 inches below the soil surface so voles can’t burrow underneath, and extend the cylinder above the typical snow line in your area (voles travel under snow cover in winter and can girdle trees well above ground level). For garden beds, you can fence the entire plot with quarter-inch mesh buried 6 inches deep.
Repellents offer some supplemental protection. Products containing thiram or capsaicin make treated plants taste unpleasant to voles. Predator urine products (fox or coyote) may increase stress in vole populations and suppress reproduction, though they need regular reapplication and work best as part of a broader strategy rather than a standalone solution.