Janesville's Hardiness Zone

Our records indicate the United States Department of Agriculture has given Janesville 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 Janesville's climate. If you are looking for plants suitable for growing in the Janesville area, head on over to our page on plants that grow well in Janesville, WI.

Metal Seed Storage Box

Organized storage solution for your seed collection.

Reusable Grow Bags

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

Self Watering Plant Pots

Innovative pots that maintain optimal moisture levels.

Raised Garden Bed Kit

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

Rustic Iron Garden Trellis

Sturdy trellis for supporting climbing plants and vines.

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 Janesville is in growing zone 5b this means that plants there can survive temperatures as low as 10 to 15 degrees Fahrenheit. Plants chosen for Janesville'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: 53545, 53546, 53548, 53547

Longitude: -89.0135

Latitude: 42.6854

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