The western meadow vole is one of Colorado’s most overlooked small mammals. Open occurrence databases hold only 85 Colorado records, 72 of them iNaturalist observations. That sparse file says more about how hard a palm-sized vole is to spot and identify than about how many actually live here.
A vole of wet meadows and grassy edges
Meadow voles need dense, moist cover: the tangled grass and sedge of wet meadows, irrigation ditches, streambanks, and streamside bottoms where their runways stay hidden. In Colorado the records lean toward the northern Front Range in Larimer and Boulder counties, with scattered points through the mountain valleys and out onto the eastern plains. This is also a recently split species, carved out of the wider meadow vole complex, so many older specimens and photographs still sit under other names and the true shape of its range is only now filling in.
Why the seasons look flat
Unlike the ground squirrels it shares its meadows with, this vole does not hibernate. It stays active all year, tunneling through the grass thatch in summer and beneath the snow in winter, breeding whenever conditions allow. So the scatter of records across the calendar tracks when biologists set traps and when a naturalist happened to catch one in the open, not any true seasonal rhythm. The animal is recorded in every month; it is simply almost never seen.
Status in Colorado
The western meadow vole is native and, despite the thin record, ranked S5 (secure) by NatureServe. The IUCN has not yet formally evaluated the newly split species, which is why no global conservation status is assigned to it.
Full species profile
