The plateau deermouse is a large deer mouse with ochre to brown upper fur, a cream belly, and a long two-colored tail. A Mexican species account describes repeated breeding cycles and litters of two to three young.
Total length is reported as 235–280 mm, with a tail of 122–163 mm. The back ranges from ochre to brown with dark hair tips; the cream-white belly has gray bases, the feet are white, and the tail is bicolored.
The species account describes females as polyestrous and reports litters of two to three young.
An extinction-risk assessment has not been added yet.