Quick Reference to Columbia Basin Gardening
Zone 7a (0º F minimum) in Benton and Franklin Counties
Zones range from 6a to 7a (-10 to 0º F minimum) in Yakima County
7 to 12 inches annually (primarily in winter)
Hot, dry and sunny.
July-August temperatures reach into the 90's, often exceeding 100º F for a few days.
Growing season is approximately mid-April to mid-October.
Generally alkaline (pH > 7).