Average volume for onion shipments are expected this season from the Columbia Basin, as well as from Treasure Valley, according to extension personnel at Washington State University and Oregon State University.
With total acreage virtually unchanged from a year ago, yellow onions account for about 80% of total onion acreage. Red onions now account for 15% of total Columbia Basin onion acreage, with white onions totaling about 5%.
Columbia Basin’s early onion harvest will likely start in early August, with storage onions beginning at the end of August or early September. Onions will be harvested and put in storage through September and into October.
Most of Washington’s storage onions are grown in the Columbia Basin, with the majority planted in Grant, Franklin and Adams counties.
Onion acreage in the Columbia Basin shared by Oregon and Washington totals about 25,000 acres. Onion harvest begins in the region begins in the late summer and can extend into the fall. Storage onions can be marketed from storage for up to eight months.
Storage onion acreage in the eastern part of Oregon and southwest Idaho, called the Treasure Valley region, accounts for about 20,000 to 25,000 acres.
Many onions in the Treasure Valley will be shipped to the East, while many of the Columbia Basin onions will move north and south, as well as to export markets.