The environment "Yehuecauhceratops" lived in, corresponding to the lower part of the upper Aguja Formation, would have been a freshwater-to-brackish coastal marsh and floodplain that were part of a river delta. Sediments also record the presence of oxbow lakes and some coastal marine deposits. Although the Mexican strata of the Aguja Formation have not been solidly dated, dating of other deposits belonging to the Aguja and the contemporary Cerro del Pueblo Formations has produced date ranges that overlap around 72.5 Ma. In Mexico, the diversity of animals in the Aguja Formation is somewhat limited. Asides from "Yehuecauhceratops", other discovered remains include the chasmosaurine "Agujaceratops mavericus", pachycephalosaur teeth; large tibiae from hadrosaurids; crocodilian teeth; and shell fragments from baenid and trionychid turtles. From contemporaneous deposits of the Aguja Formation in Texas, numerous dinosaurs are known; they include the chasmosaurine "Agujaceratops mariscalensis", the saurolophine "Kritosaurus", the pachycephalosaur "Texacephale", and the tooth taxon "Richardoestesia", as well as unnamed lambeosaurines, nodosaurs, tyrannosaurs, ornithomimids, caenagnathids, and dromaeosaurs. Non-dinosaurs include the giant alligatoroid "Deinosuchus" and a goniopholidid; the squamates "Odaxosaurus", "Proxestops", "Restes", "Sauriscus", and various unnamed taxa; the turtles ""Baena"" and ""Aspideretes"", as well as an additional chelonian; the amphibians "Albanerpeton", a scapherpetonid, a salamander, and a frog; the mammals "Cimolomys", "Meniscoessus", "Cimolodon", "Alphadon", "Turgidodon", "Pediomys", "Gallolestes", and others; various bony fish; and the cartilaginous fish "Hybodus", "Lissodus", "Scapanorhynchys", "Onchopristis", "Ischyrhiza", "Squatirhina", "Ptychotrygon", and others.