Including the frill, the skull of this Vagaceratops irvinensis would be 1.4 m long in real life. At its widest, the frill would be 1 m. The first part of the name of this species of dinosaur recognizes one of the skull's characteristics: openings, or "chasms", in the frill. These openings are visible in the bare bones, and indentations are visible on the skin surface. It is likely the frill was useful for species recognition and display rituals, especially during courtship and combat (it would make the animal look larger).

This animal would be about 3 m long from the tip of its snout to its hip, with its tail adding another 2 m. The tail would have been very heavy, and would have acted as a counterbalance to the weight of the skull at the other end.