Alexander Valley, Russian River Valley, Dry Creek Valley, and Chalk Hill. Our four AVAs, or American Viticultural Areas, all have traits that lend themselves to different wines: whether it be a grape that grows better in its soil, or a microclimate that lends itself to white vs red, or simply the minerals in the soil that developed before humans walked the earth. Often wineries source from vineyards in multiple AVAs, while others might specialize exclusively in one. Join us on a beautiful afternoon at Cast Winery and discuss the differences of each AVA. Cast sources grapes from vineyards in The Russian River, Dry Creek, and Alexander Valleys.