[1] Its fossils have been found in the upper Two Medicine Formation in the present-day U.S. state of Montana, in Campanian age rock layers that have been dated to 74.3 million years ago.

[2] Fossils were also found in the Oldman Formation in the modern day Canadian province of Alberta, dating to around 77 million years ago.

[3][4] Prenoceratops was first discovered on a Blackfeet reservation in Pondera County, Montana in layers coming from the Campanian Two Medicine Formation.

[5] The locality at which Prenoceratops was found was filled with many disassociated fossil elements of many individuals, known as a bonebed, though only the skull material has been described as of 2022.

[5] Prenoceratops belonged to the Ceratopsia (which name is derived from Ancient Greek, meaning 'horned face'), a group of herbivorous dinosaurs with parrot-like beaks, which thrived in North America and Asia during the Cretaceous Period.