[2] In 2004, Washington ranked first in the nation in production of red raspberries (90.0% of total U.S. production), wrinkled seed peas (80.6%), hops (75.0%), spearmint oil (73.6%), apples (58.1%), sweet cherries (47.3%), pears (42.6%), peppermint oil (40.3%), Concord grapes (39.3%), carrots for processing (36.8%), and Niagara grapes (31.6%).
Washington also ranked second in the nation in production of lentils, fall potatoes, dry edible peas, apricots, grapes (all varieties taken together), asparagus (over a third of the nation's production), sweet corn for processing, and green peas for processing; third in tart cherries, prunes and plums, and dry summer onions; fourth in barley and trout; and fifth in wheat, cranberries, and strawberries.
Because of the favorable climate of dry, warm summers and cold winters of Central Washington, the state has led the U.S. in apple production since the 1920s.
This means that the health of the industry is largely dependent on global market conditions.
[12] The rain shadow of the Cascade Range leaves the Columbia River Basin with around 8 inches (200 mm) of annual rain fall, making irrigation and water rights of paramount interest to the Washington wine industry.