County of Washington, District of Columbia, DC, USA plant hardiness zones (gardening zones)

Plant hardiness zones (winter frost zones or gardening zones) range for County of Washington, District of Columbia (DC), USA is:

• 7b

by the USDA scale.

• coldest zone's winter temperature: +5 … +10 °F

Cities of County of Washington, District of Columbia (DC), USA

• WashingtonUSDA hardiness zone: 7b