Wyoming is far-western outpost country for the white-footed mouse, an animal of eastern and central woodlands, and the state’s 21 records sit mostly along the range’s frayed edge. Carbon and Crook counties lead with five reports each, followed by Park with four; the rest sprinkle across six more counties, including a single record as far west as Teton.
Every report falls between June and September. A summer-only pattern that tidy says more about when small-mammal trapping happens in Wyoming’s mountains than about the mouse, which stays active through winter wherever it lives.
NatureServe ranks the species S3, vulnerable, in Wyoming, a typical standing for a widespread animal at the thin end of its range. The records cluster in the state’s east and north, where wooded draws, shrubby stream bottoms, and ponderosa edges reach farthest into the high plains. Whether the mouse is genuinely scarce in Wyoming or simply undertrapped is a fair question; the honest answer from 21 records is that nobody has looked hard enough to know.
Full species profile
