Individuals of the genus "Styracosaurus" were approximately long as adults and weighed around 2.7 tonnes. The skull was massive, with a large nostril, a tall straight nose horn, and a parietosquamosal frill (a neck frill) crowned with at least four large spikes. Each of the four longest frill spines was comparable in length to the nose horn, at long. The nasal horn was estimated by Lambe at long in the type specimen, but the tip had not been preserved. Based on other nasal horn cores from "Styracosaurus" and "Centrosaurus", this horn may have come to a more rounded point at around half of that length.