Mammals Active day and night

Gray-tailed Vole

Microtus canicaudus

iNaturalist Wikipedia

Meet the elusive architect of the Willamette Valley. The Gray-tailed Vole is a master of camouflage and tunnel engineering, found only in a small corner of the Pacific Northwest.

0 Sightings

0 Habitats

Quick Identification

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Size

Total length 14–16 cm (5.5–6.3 in); Weight 30–50 g (1.1–1.8 oz)

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Colors

Yellowish-brown to grayish-brown upperparts; distinctly gray or silvery underparts; bicolored tail (dark gray above, light gray below)

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Key Features

Short, bicolored tail roughly 1/4 of body length
Small, rounded ears nearly hidden in thick fur
Stocky, mouse-like build with a blunt snout
Soft, grayish-brown fur with silvery-gray belly

When You’ll See Them

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Activity pattern Active day and night

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Peak hours Dawn and dusk (crepuscular peaks)

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Season Year-round

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Diet Primarily herbivorous, focusing on green grasses, clover, seeds, and agricultural crops like alfalfa, clover, and various grains.

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Habitat Grasslands, wet prairies, agricultural pastures, and occasionally suburban meadows or gardens with thick ground cover.

public Geographic range

Where Does the Gray-tailed Vole Live?

This specialized rodent is a true Pacific Northwest endemic, found nowhere else on Earth. Its native range is confined to the fertile Willamette Valley in western Oregon and extends slightly north across the Columbia River into Clark County, Washington. Within this small geographic footprint, they thrive in open prairie habitats and modern agricultural lands that mirror their historical grassland homes.

Basemap © OpenStreetMap contributors

1 Countries

15K km² Range

Least Concern Conservation

US United States

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iNaturalist / Verified observation data

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Behavior

The Gray-tailed Vole is a secretive architect of the Pacific Northwest grasslands. These rodents are primarily known for constructing elaborate networks of surface runways and underground burrows, which they use to navigate safely away from the watchful eyes of hawks and owls. They are social creatures to an extent, often sharing tunnel systems with other burrowing species, though they remain notoriously difficult to trap or observe directly.

Vole populations are famous for their 'boom and bust' cycles, where numbers can skyrocket one year and plummet the next for reasons still being studied by biologists. In suburban and agricultural settings, they are often viewed as pests due to their efficiency at harvesting seeds and grasses, yet they play a crucial role in the ecosystem as a primary food source for many local predators, including the Great Horned Owl and the American Kestrel.

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Camera Tips

Capturing the Gray-tailed Vole on camera requires a 'micro' approach. Because these rodents spend most of their lives in tunnel systems or under the cover of tall grass, you should look for 'runways'—well-worn paths about two inches wide in the thatch. Place your camera just three to five inches off the ground, angled slightly downward to focus on the runway itself rather than the horizon.

Since they are sensitive to movement and light, a camera with a 'no-glow' or 'black' infrared flash is essential to avoid spooking them during their nocturnal forays. Use a high-sensitivity trigger setting and the shortest possible trigger delay, as these voles move quickly when crossing open patches. If you aren't seeing results, try placing the camera near a 'V-junction' in their trail network where activity is highest.

While they are active year-round, you will have the best luck in late spring and summer when vegetation provides cover but hasn't yet completely obscured the trail. For baiting, a small smear of peanut butter or a small pile of birdseed near a burrow entrance can encourage them to pause long enough for a clear photo. Ensure your camera's focal length is set for close-range shots if possible, as a vole just a foot away may appear blurry on standard trail cameras designed for deer.

Similar Species

Species that look similar or are commonly confused with Gray-tailed Vole.

Montane Vole

Found at higher elevations; the Montane Vole has different footpad structures and a less distinctly bicolored tail.

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Frequently Asked Questions

Gray-tailed Vole are active both day and night throughout the year. However, they exhibit peak activity during the 'golden hours' of dawn and dusk (crepuscular activity) when the low light provides extra protection from visual predators like hawks.

To attract Gray-tailed Vole, maintain a 'wild corner' of your yard with tall, unmowed native grasses and leaf litter. They require thick overhead cover to feel safe. Providing a consistent source of birdseed or planting clover can also encourage them to establish a tunnel network in your garden.

Their diet is almost entirely plant-based. They primarily eat the green stems and leaves of grasses and forbs, but they also consume seeds, roots, and bulbs, especially during the winter months when green vegetation is less available.

Yes, they are quite common in suburban areas within the Willamette Valley, particularly in backyards that border open fields, parks, or grassy roadsides. Because they are so elusive and live mostly in tunnels, many homeowners have them without ever realizing it.

The Gray-tailed Vole has a shorter tail (usually less than 45mm) that is distinctly darker on top and lighter on the bottom. Its belly fur is also a clearer, more silvery-gray compared to the buffy or brownish belly of the more widespread Meadow Vole.

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