Allen's squirrel occurs in northeastern Mexico. A winter study in Nuevo León recorded it active in cold weather and caching nuts in scattered locations.
An adult male collected in forest in Nuevo León had yellow-brown to light gray upper fur, a darker midline, a tail mixed with black and white hairs, and a white underside.
A winter study in Nuevo León recorded Allen's squirrels active in freezing weather and storing nuts in scattered locations.
An extinction-risk assessment has not been added yet.