Wyoming’s plains harvest mouse file holds no records from 2000 to 2026, and the older reports came mostly from the state’s eastern tier, chiefly Goshen, Weston, and Campbell counties. That’s the low, warm, grassy side of Wyoming, and the rest of the state may simply be too high and cold for a mouse of the central plains. Or the east is just where the traps have been. With no current records at all, both can be true at once.
NatureServe considers the mouse apparently secure in Wyoming, ranked S4, and the IUCN lists it as Least Concern. Thunder Basin’s big grasslands and the stream corridors along the state line hold its kind of habitat in broad blocks. The lack of recent records doesn’t by itself signal trouble; it mostly suggests that few people have gone looking for a mouse this small.
Full species profile
