Eight species of voles live across Colorado, from the eastern plains grasslands to alpine meadows above treeline. These small, mouse-like rodents thrive in heavy ground cover of grasses and plant litter, and they’re active year-round. Whether you’re trying to identify a species you spotted on a hike or figure out what’s chewing up your yard, here’s what you need to know about Colorado’s voles.
Eight Vole Species Across the State
Colorado’s voles occupy nearly every ecosystem in the state, each species adapted to a specific elevation range and habitat type.
Meadow voles are found from north to south-central Colorado and along the South Platte River. They prefer damp, marshy areas, wet meadows, and riparian corridors. If you live along the Front Range near a creek or irrigation ditch, this is the species most likely showing up in your yard.
Montane voles inhabit the western half of the state in moist meadows and valleys with thick grass cover, from around 6,000 feet up to above timberline. Long-tailed voles overlap much of that same mountain territory but range into drier grassy areas, particularly streamside meadows on high plateaus.
Southern red-backed voles stick to moist, well-developed coniferous forests, especially lodgepole pine stands between 8,000 and 11,000 feet. Western heather voles range from 7,000 feet to above treeline in central Colorado and are most common along streams.
Prairie voles occupy the grasslands, streams, and irrigated lands of eastern Colorado. Sagebrush voles live in the driest habitats of any Colorado vole, found in sagebrush country between 5,000 and 9,000 feet in western and north-central parts of the state. And Mogollon voles have the most limited range, restricted to the very southern part of Colorado in Las Animas and Montezuma Counties, where they live in ponderosa pine woodland and pinon-juniper habitats.
How to Tell Voles Apart From Moles and Gophers
Voles are often confused with moles and pocket gophers, but moles are actually rare in Colorado, found only on the very eastern plains. Pocket gophers are far more common statewide, and the damage they leave looks quite different from vole damage.
The easiest way to tell the difference is by looking at the ground. Voles create 1- to 2-inch-wide runways through matted grass, with small open holes at the surface. You’ll often see clipped vegetation and tiny droppings along these paths. The soil near active runways feels spongy underfoot. Pocket gophers, by contrast, rarely appear above ground. They leave fan-shaped or round mounds of soil with no visible entrance hole, and their tunnels run 2.5 to 3.5 inches in diameter, typically 4 to 18 inches below the surface. In spring, pocket gophers also leave behind “eskers,” solid tubes of soil on the surface where they packed dirt into snow tunnels over winter.
If you’re seeing narrow surface trails through the grass with small open holes, you have voles. If you’re seeing closed dirt mounds with no runways, you have pocket gophers.
Damage Voles Cause to Yards and Trees
Voles cause the most noticeable damage during winter, when they tunnel beneath snow cover and chew on whatever they can reach. Because the snow hides their activity, many Colorado homeowners don’t realize they have a vole problem until spring melt reveals a network of shallow, crisscrossing runways carved through the lawn.
The turf damage, while ugly, is mostly cosmetic. The bigger concern is tree and shrub damage. Voles girdle woody plants by chewing bark in a ring around the base of the trunk at ground level. The gnaw marks are distinctive: irregular patches roughly 1/8 inch wide by 3/8 inch long, and at least 1/16 inch deep. Gnawed stems often have a pointed tip. This girdling typically happens in fall and winter and goes unnoticed until spring. Young trees that have been girdled more than 50% around the trunk have a low survival rate, so catching this early matters.
Population Booms and Busts
Vole populations are cyclical. They breed rapidly, with multiple litters per year, and under favorable conditions their numbers can surge dramatically. A property that had no visible vole activity one year can be overrun the next. These population peaks tend to be followed by sharp crashes driven by predation, disease, and food shortages. Hawks, owls, foxes, coyotes, and snakes all feed heavily on voles, and these predators play a major role in bringing populations back down. The boom-and-bust pattern means that a bad vole year doesn’t necessarily predict a bad next year.
Legal Rules for Trapping in Colorado
Colorado Parks and Wildlife classifies voles as a species that landowners (or their agents) can hunt, trap, or remove on private property experiencing damage without a permit. If you want to sell or trade pelts or hides, you’ll need an appropriate small game or furbearer license.
There’s an important restriction on trap types: Colorado generally requires the use of live traps (cage or box traps). Small game and furbearers caught in live traps cannot be relocated. They must be killed or released on site when the trap is checked.
Managing Voles on Your Property
Habitat modification is the most effective long-term strategy. Voles depend on dense ground cover for protection from predators, so reducing that cover makes your property less hospitable. Keep grass mowed short, especially in fall before snow arrives. Pull mulch back from tree trunks, clear brush piles, and remove thick ground litter near garden beds. The less cover voles have, the more vulnerable they are to predators, and the less likely they are to establish runway systems.
To protect individual trees, wrap the lower trunk with hardware cloth or a similar barrier that extends a few inches below the soil surface and high enough to sit above expected snow depth. This prevents girdling during winter when voles move freely under the snowpack.
If you spot active vole runways, rodent stations designed for outdoor use can be placed perpendicular to the trails. For large infestations, trapping along active runways tends to be more effective than random placement.
Repairing Spring Lawn Damage
Once the snow melts and you can see the runway damage, rake out the dead grass from the shallow tunnel network as soon as the ground is clear. This opens up the soil to air and light and helps surrounding grass start filling in. Hold off on reseeding bare patches until temperatures stay consistently between 60°F and 80°F, since grass seed won’t establish in frosty conditions. Most Colorado Front Range lawns hit that window in late April through May, though mountain properties may need to wait until June. Small runway damage often fills in on its own once the grass starts growing. Larger bare spots will need overseeding and light topdressing with soil to get full coverage back.