Fraxinus quadrangulata
 Blue Ash redirects here. For other uses see Blue Ash (disambiguation)Fraxinus quadrangulata (Blue Ash) is a species of Fraxinus native primarily to the Midwestern United States from Oklahoma to Michigan as well as the Bluegrass region of Kentucky and the Nashville Basin region of Tennessee. Isolated populations exist in Alabama Southern Ontario and small sections of the Appalachian Mountains.