Idaho is a state in the Western part of the United States of America. The climate of the wine region in Idaho much resembles eastern Washington, though the Day-Night Temperature is greater. The effect of this climate is and unpredicted combination of grapes with high acidity and high sugar. Unfortunately the growers here have to deal with Idaho's bitter winter. The challenge for the grapes is not necessarily ripening but surviving. Riesling thrives in these harsh conditions and produces good sweet wines. Pinot noir and Chardonnay are also grown with some success; where as the Cabernet Sauvignon doesn't do well in the short growing season.