 North of the Rattlesnake Hills is a region commonly known as Columbia Cascade, but which is not officially recognized as an American Viticultural Area.Other wine growing regions of distinction that have not yet been granted AVA status include the Othello region located in Adams County and the Tri-Cities area around the towns of Kennewick, Pasco and Richland.The vast size of the appellation allows for an array of diverse microclimates among the various sub-appellations, but the whole region shares the common climate traits of cold winters and long dry growing seasons with low humidity.