Mercer Island's Hardiness Zone

Our records indicate the United States Department of Agriculture has given Mercer Island a growing zone designation of 9a. Sometimes also called the planting zone or hardiness zone, this zone number gives you an idea of what plants can and cannot grow in Mercer Island's climate. If you are looking for plants suitable for growing in the Mercer Island area, head on over to our page on plants that grow well in Mercer Island, WA.

Fiskars Garden Harvest Basket

Sturdy basket for collecting and carrying your garden harvest.

Small Greenhouse Kit

Compact greenhouse perfect for small spaces.

Stainless Steel Garden Tool Set

Complete garden tool set with heavy-duty stainless steel tools for all your gardening needs.

Brass Decorative Faucet Handle

Elegant brass handle to enhance your garden faucet.

Cluck Around Sign

Whimsical sign for your chicken coop area.

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 Mercer Island is in growing zone 9a this means that plants there can survive temperatures as low as 10 to 15 degrees Fahrenheit. Plants chosen for Mercer Island'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.

Steel Hori Hori Weeding Knife

Versatile Japanese-style gardening knife for weeding and planting.

Worm Composting Kit

Complete kit for starting your own worm composting system.

Large Greenhouse Kit

Spacious greenhouse for extending your growing season.

Reusable Grow Bags

Breathable fabric grow bags that promote healthy root growth for your vegetables and fruits.

Raised Garden Bed Kit

Easy-to-assemble raised garden bed for better soil control and drainage.