The vineyards of Washington State are located east of the Cascade mountains. Columbia Valley is the most famous appellation here and because it lies in the rainshadow of these mountains, it is a very dry and arid landscape where irrigation is often necessary. The fruit easily ripens thanks to long sunny days and consistently warm temperatures while grape’s can maintain enough natural acidity as a result of cool nights. Many vineyards are planted on their own rootstocks as there is no risk of Phylloxera spreading in the region’s sandy soils. Winter freeze, however, is a risk here and often large parcels of vineyard need to be replanted when the damage is so bad. Look for Chardonnay, Merlot, Cabernet Sauvignon and Syrah. Riesling is also on the rise.