Young apparently born and raised in a nest built in the burrow. No data found. No additional data found. May become torpid during extreme heat or cold. No data found.
Reproduction probably occurs during spring and early summer.
P. inornatus is similar in appearance, and probably in habits, to P. Iongimembris. Badgers, owls, weasels, skunks, kit foxes, and domestic cats probably prey on San Joaquin pocket mice. Review of the recent mammal fauna of California. Hawbecker, A. C. 1951. Small mammal relationships in an Ephedra community.