The United States is a huge country, spanning from the Atlantic to the Pacific. From dry deserts, areas of open plains to subarctic and tropical regions, the variety of plants vary greatly as you go about from region to region.
Why Are The USDA Hardiness Zones Important?
The USDA hardiness zones represent the average of extreme minimum temperatures for an area, calculated from the lowest daily minimum temperature recorded. This does not represent the coldest it has ever been or ever will be in an area. It simply is the average of lowest winter temperatures for a given location for this time period. This is also important to know for both rural and urban planters. Cities hold more heat because there is more blacktop and concrete, so a city may have a higher zone than the surrounding rural areas. Areas with higher elevation tend to be colder than surrounding low laying areas so they may have a cooler zone. Locations near a large body of unfrozen water may have milder winter weather and will be considered to be in a warmer zone.
USDA Hardiness Zones
Here is a list of all of the zones as named by the USDA, with their temperature ranges and a few examples of cities that reside these zones.
Remember that the USDA hardiness zones are simply a tool to help gardeners choose the best plants for their area. This is by no means an absolute and many plants can grow in different zones. Make sure you are doing your research before you buy plants and vegetable seeds for your garden.