Edna Valley AVA is within San Luis Obispo County, and within the large Central Coast AVA. Edna Valley became an AVA in 1982 and it includes 22,400 acres of extremely fertile land blessed with a long growing season. Pinot Noir and Chardonnay are the principal grapes, though Syrah, Sauvignon Blanc, Pinot Gris, Albarino, Grenache, Viognier, Merlot and Petite Sirah also are grown. Spanish missionaries were growing grape vines in the Edna Valley in the 18th century, but the valley’s modern wine industry took off in the 1970s. Today there are more than 50 Edna Valley wineries.