[8] Before large scale irrigation in Eastern Washington, San Juan County was the state's most important apple production region.
[11] Two Eastern Washington areas account for the vast majority of the state's apple crop: the Wenatchee–Okanogan region (comprising Chelan, Okanogan, Douglas, and Grant counties), and the Yakima region (Yakima, Benton and Kittitas counties).
[10] Apple boxes were used to preserve fruit quality during transportation, and Wenatchee emerged as a production center.
Improvements and innovation in packaging technology during the war allowed apples to last longer in transit.
The rise in commercial trucking after the war radically altered the industry as growers and packers were no longer dependent on the railroads to reach distant markets.
Other new varieties developed elsewhere but grown in large acreage in Washington include Arctic Apples and SweeTango.