Utah’s occurrence data hold 21,273 records of the deer mouse, more than any other mammal tracked in the state’s atlas. That’s less a measure of how many mice are out there than of how easy this small, adaptable rodent is to find and photograph.
A generalist that fits every biome the state has
Few Utah mammals could plausibly turn up everywhere from the salt-crusted shoreline of the Great Salt Lake to alpine talus above 12,000 feet in the Uinta Mountains, with the canyon country and red-rock benches of the Colorado Plateau in between. The deer mouse manages it, because it only needs a hidden nest spot and a nearby seed crop or insect supply, a bar so low that almost every one of Utah’s wildly different landscapes clears it somewhere.
A nighttime forager that doesn’t mind a cabin
Deer mice do most of their foraging after dark, working through seeds, insects, and fruit depending on the season, and nesting in rock crevices, burrows, or woodpiles. That includes the woodpiles and outbuildings around Utah’s mountain cabins and campgrounds, which is part of why the species racks up so many more records than animals that stay well clear of people.
Records swell as the breeding season peaks
Monthly counts climb through spring and roughly quadruple by August and September. Deer mice can produce several litters in a single season, so those months hold both a fresh crop of young mice and the peak of Utah’s hiking and camping season, when more observers are out to notice them.
Status in Utah
NatureServe ranks the deer mouse S5, secure, in Utah, and it’s native across the state. It holds ground in nearly every Utah habitat that offers cover and a food source, from desert shoreline to alpine ridge.
Full species profile
