The least chipmunk is a small mammal in Colorado. Open occurrence databases hold 1,774 records for it here, drawn largely from museum collections and field surveys rather than casual photos. As the smallest and most widespread chipmunk in North America, it turns up across a remarkable range of Colorado habitats, yet its size and quickness keep it underrepresented in the kind of records a passing hiker contributes.
From sagebrush flats to timberline
The least chipmunk is a habitat generalist, and the Colorado records show it: they span shrub and sagebrush country, open coniferous woodland, rocky slopes, and the edges of alpine meadow near timberline. Boulder and Larimer counties carry the heaviest counts, with strong representation from the mountain and western-slope counties around Gunnison, Mesa, and Jackson. It favors broken ground with cover, foraging on seeds, berries, and insects and darting between shrubs and rock piles with its tail held upright. Where other chipmunks specialize, this one tolerates drier, more open terrain, which widens its footprint across the state.
A summer animal that sleeps out the cold
The occurrence record thins to almost nothing in the cold months, and that gap is real biology rather than an artifact of who is watching. Least chipmunks enter torpor and retreat to burrows through winter, living off cached food and emerging only in spring as the ground warms. Their aboveground season runs through the warm months, when they are busiest gathering and storing seeds for the next dormancy.
Status in Colorado
The least chipmunk is native to Colorado and ranked S5 (secure) by NatureServe, with the IUCN listing it as least concern. It is one of the state’s most quietly ubiquitous rodents, common from the foothills to the alpine edge.
Full species profile
