Is fescue grass a native species to the east coast of the United States of America?

Fescue (Festuca L.) is not a species but a genus of grasses. Some species are native and others are not. If you go to the USDA Plants Database and enter Name Search Results | USDA PLANTS type either the common or scientific name. It will show you all the species of fescue. Clicking on any of them will bring up information about that species, including which states it grows and whether it is native or introduced.