Based on the United States Department of Agriculture's Plant Hardiness Zone Map, each part of the United States is assigned a "growing zone" to help gardeners and growers determine which plants, trees, and shrubs will work best in their region.  

The value/number for each zone is based on the lowest average temperatures for the area. On this scale, the lower the growing zone number assigned to your area, the lower the average temperatures are recorded for the assigned region. While there is no "standardized" system used to determine which plants work best in the USA, the USDA's Hardiness Zone Map is the most commonly used.  

To determine your "growing zone," refer to the map on this page:  https://www.naturehills.com/plant-zone-map.  You can also enter your zip code in the "FIND YOUR GROWING ZONE" box located on any plant product page on the site.  Once entered, you'll see your zone