This species reaches the northern limit of its range in southwest Oregon. Oak and Juniper titmice were formerly in the same species as the Plain titmouse but were recognized as a separate species in 1997. The drab, gray color with distinct crest and chickadee-like calls and behavior characterizes these species. Plumage of sexes is identical.
The Oak titmouse is a friendly, high-spirited, and melodious bird of oak-dominated habitats of interior valleys and lowlands. It is a common resident in oak woodlands of the interior Rogue Valley, and a rare but permanent resident in Illinois Valley.