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In south-central Washington, Great Basin pocket mice emerged from March to April. They emerge from their burrows and mate in early spring. In late fall and winter, Great Basin pocket mice remain in their burrows in a state of torpor. Riparian zones may have larger concentrations of Great Basin pocket mice than upland areas. On the eastern slope of the Cascade Range and the Sierra Nevada, it occurs in ponderosa pine ( P. It most commonly occurs in sagebrush ( Artemisia spp.), shadscale ( Atriplex confertifolia), and other desert shrublands, and in pinyon-juniper ( Pinus-Juniperus spp.) woodland. The Great Basin pocket mouse occupies steppes and open, arid shrublands and woodlands. It is not certain whether its distribution is disjunct or joins that of P. The yellow-eared pocket mouse occurs on the eastern slope of the Tehachapi Mountains in Kern County, California. yakimensis (Broadbooks) – south-central Washington trumbullensis (Benson) – southern Colorado northern Arizona parvus (Peale) – southeastern Washington central and eastern Oregon olivaceus (Merriam) – most of Nevada eastern California extreme southeastern Oregon southern Idaho western Colorado the most widely distributed subspecies mollipilosus (Coues) – south-central Oregon north-central and northeastern California lordi (Gray) – extreme south-central British Columbia central and eastern Washington northwestern Idaho laingi (Anderson) – south-central British Columbia idahoensis (Goldman) – south-central Idaho columbianus (Merriam) – central and southern Washington clarus (Goldman) – extreme southwestern Montana southeastern Idaho extreme north-central Utah extreme southwestern Wyoming Perognathus parvus bullatus: (Durrant and Lee) – central and east-central Utah.It is distributed from south-central British Columbia and eastern Washington south to southeastern California, Nevada and northern Arizona, and east to southeastern Montana and Wyoming. The Great Basin pocket mouse occurs in the Columbia River Basin and the Great Basin and adjacent lands. However, Jones and others classify the yellow-eared pocket mouse as a distinct species, P. xanthonus Grinell, a subspecies of the Great Basin pocket mouse. Sulentich and Genoways and Brown classify the yellow-eared pocket mouse as P.