Plant Zone Map Washington State. Based on the 1990 USDA Hardiness Zone Map this interactive version covers the state of Oregon which ranges from USDA Zone 4a to USDA Zone 9b. The new maps cover Washington State and feature information related to Plant Hardiness Zones and Growing Degree Days.
When shopping for new plants for your garden landscape the terms plant hardiness zones growing zones and planting zones. The map was revised in July 1973. Hardiness Zone Map provided courtesy of The National Arbor Day Foundation.
Zone 6 45-60 days Leavenworth.
Mild ocean air moderates Zone 5 allowing it to produce some of the finest rhododendrons Japanese maples and rock garden plants anywhereHeaths and heathers thrive in sandy soils along the coast and inland and katsura trees reach their prime rarely scorching as they may inland. Interactive Plantmaps Gardening and Plant Hardiness Zone Map for Washington. United Kingdom Plant Hardiness Zone Map. You can find your USDA zone with state maps that are based on extreme minimum temperatures.
