Idaho’s occurrence databases hold 202 red-backed vole records, ranking 52nd among the 80 mammals tracked in this batch. Records like these depend heavily on small-mammal trapping surveys, so the count says more about where biologists have looked closely at the forest floor than about how many voles are actually out there.
A forest-floor animal, not a plain-country one
Every Idaho record for this vole comes out of cool, moist conifer forest with a thick mat of needles, moss, and downed logs, the kind of ground found in the cedar-hemlock stands of the Idaho Panhandle and the spruce-fir forests high in the Sawtooths. That habitat requirement rules out most of the state: the open sagebrush country that covers so much of southern Idaho is simply too dry and too exposed for a species that lives its whole life under litter and rotting wood.
Underground and under snow
The red-backed vole spends its days tunneling through leaf litter and rotten logs, eating fungi, seeds, and berries as it goes, and its droppings spread fungal spores that help the same forest floor regenerate. It doesn’t hibernate. Through the Idaho winter it stays active in the space between the ground and the snowpack, a cover that keeps it fed and hidden even when the surface above is buried.
Why the record window is only five months wide
Every one of Idaho’s 202 records falls between May and October, with nothing logged from November through April. That gap isn’t a sign the vole disappears. It’s a sign that once snow covers the forest floor, the animal is sealed away from the surveys and casual sightings that produce most records in the first place.
Status in Idaho
NatureServe ranks the red-backed vole S4, Apparently Secure, in Idaho, and it’s native to the state’s forested mountains. Its thin, seasonal record trail is a function of survey access and snow cover, not a sign that the vole itself is scarce.
Full species profile
