The body of the olive rockfish is elongate and compressed. The upper profile of the head is almost straight, and the snout is long and pointed. The lower jaw is projecting. The olive rockfish is dark olive brown on the back, often with some light areas under the dorsal fin. The sides are a lighter olive green, and the fins are yellow. This species is very similar in appearance to the yellowtail rockfish. The olive rockfish always has nine soft rays in the anal fin; the yellowtail rockfish usually has eight.