The southern meadow jumping mouse is very sparsely recorded in Colorado. Open occurrence databases hold just 2 Colorado records for it from 2000 to 2026, and neither is an iNaturalist photo. Both are museum specimens, the only realistic way to confirm a mouse this scarce and this hidden.
A streamside mouse in a dry-country corner
Unlike the plains rodents around it, this is a wetland animal. It needs the moist, tangled sedge and grass along streams and springs, a rare commodity on the southeastern high plains. Every Colorado record sits in Las Animas County, in the streamside threads of the Purgatoire canyon country, where a ribbon of wet meadow cuts through otherwise arid ground. The species does not spread out across the prairie; it follows the water.
A marathon hibernator
The jumping mouse is a true, deep hibernator, and few North American mammals sleep as long. It can spend the better part of the year dormant underground, emerging only for a short warm-season window to feed, breed, and fatten before going back under. That schedule leaves an extremely narrow band of activity, so even a resident population produces almost no records, and both recent Colorado records date from August.
A critically imperiled specialist
NatureServe ranks the species S1, critically imperiled in Colorado, with its global rank unassessed. The thin, single-county record reflects both its rarity and its total dependence on scarce streamside habitat. The Pawnee and Comanche National Grasslands and Barr Lake State Park lie within the state’s plains, but this is a mouse defined by streamside wet meadows, and finding one is a matter for careful survey work, not casual observation.
Full species profile
