The Idaho pocket gopher (Thomomys idahoensis) is a species of rodent in the family Geomyidae.

[8] The gopher's skull is small and lightly built, with incisors that are slender and not procumbent (inclined towards the lips).

Its baculum (a bone present in the penis of many mammals) is rather long, from 17.8 to 23.4 millimetres (0.70 to 0.92 in), and the bullae (bony structures in the back of the skull) are large.

They remain active for the entire year, and store excavated soil in their burrows, which stays after the snow has melted.

[3][4] It is not known what the Idaho pocket gopher eats, although related species consume parts of plants from vegetation below and above ground level, mainly forbs and grasses.

[3] It is likely similar to the northern pocket gopher with regards to breeding behavior: the latter species gestates for 19 to 20 days and bears between four and seven offspring.

[1] It is listed in the Utah Wildlife Action Plan as a species greatly needing conservation.