The eastern cottontail is the largest member of the genus in Oregon. Overall, the dorsal pelage is brownish, becoming darker (almost black) on the rump and lighter buffy brown on the flanks; the nape patch is orangy brown without black hairs, and the head is the same color as the dorsum. The hairs on the dorsum have steel gray bases followed by bands of brownish black, buff, and black. The venter hairs are white with gray bases, giving a splotched appearance when the hairs are spread, and the tail hairs are white to the base.
This rabbit was introduced into Benton County in 1937 and into Linn County in 1941 from Ohio and Illinois. From these sites, Eastern cottontails have spread at least through the mid-Willamette Valley. The source of animals in the Portland area is unknown, but it may be from Missouri stock introduced near Battle Ground, WA in 1933.
In the Willamette Valley, coverts occupied by the Eastern cottontail commonly contain large clumps of blackberries interlaced around small white oak, ash and black cottonwood trees and interspersed among grasses and forbs.