Pyrausta grotei is a moth in the Crambidae family. It was described by Munroe in 1976. It is found in North America, where it has been recorded from Washington, Oregon, Montana, California, Utah, Colorado, Wyoming, Nevada, Arizona and Texas. The forewings are dark vinous rosy with a brown base. There is a pale yellow spot on the costa. The hindwings are fuscous. Adults have been recorded on wing from April to August.