The narrowest stripe centers on the backbone, while on each side from shoulder to rump two more dark stripes sandwich a cream-colored band. On the sides of the face two buffy stripes outline the eye, and a black stripe runs through it. Adults molt in late spring or early summer and again in late fall or early winter. Winter pelage is slightly paler than summer. Albino and melanistic individuals occur.
Chipmunks are graceful and spry, quick to dart for their underground burrows when startled.
They run with their bushy tails held straight up. Their senses of sight and hearing are keen. When eating they often perch on stumps, rocks or logs, to survey their surroundings. Tamias striatus is a vocal creature. Chipmunks are omnivorous.