Washington's Hardiness Zone

Our records indicate the United States Department of Agriculture has given Washington a growing zone designation of 5b. Sometimes also called the planting zone or hardiness zone, this zone number gives you an idea of what plants can and cannot grow in Washington's climate. If you are looking for plants suitable for growing in the Washington area, head on over to our page on plants that grow well in Washington, IA.

Seed Starting Trays

Perfect for starting seeds indoors before transplanting to your garden.

Cluck Around Sign

Whimsical sign for your chicken coop area.

Fiskars Garden Harvest Basket

Sturdy basket for collecting and carrying your garden harvest.

Rustic Iron Garden Trellis

Sturdy trellis for supporting climbing plants and vines.

Hydroponic Garden Grow Kit

Grow fresh herbs and vegetables year-round with this indoor hydroponic garden system.

Understanding your growing zone is very important because it is a measure of the lowest temperature that a plant can survive, helping you to decide what plants would grow best in your particular climate. Since Washington is in growing zone 5b this means that plants there can survive temperatures as low as 10 to 15 degrees Fahrenheit. Plants chosen for Washington's climate should be chosen with this in mind or plants should be moved inside to keep their core temperature in the right range if necessary.

USDA Growing Zone: 5b

Zip Codes: 52353

Longitude: -91.6928

Latitude: 41.2981

Lowest Avg Temperatures (F): -15 to -10