The map is based on 30-year averages of the coldest winter temperatures at specific locations, and divides the continental U.S. and Canada into 10 zones, which are further divided into half-zones.

This winter, the U.S. Department of Agriculture released a new Plant Hardiness Zone Map, considered to be a national standard that gardeners can reference to know which plants are most likely to ...

This winter, the U.S. Department of Agriculture released a new Plant Hardiness Zone Map, considered to be a national standard that gardeners can reference to know which plants are most likely to ...

Sometimes called “growing zones” or “gardening zones,” hardiness zones refer to a map developed by the USDA that separates the United States into regions based on the average low winter ...

The Plant Hardiness Zone Map is based on the average annual extreme minimum winter temperature, displayed as 10-degree F zones ranging from zone 1 (coldest) to zone 13 (warmest), the USDA notes.

Zones don’t change often—the map was last updated in 201—but when it does change, as it just did, it can upend what you know about your garden. It used to be easier to find your hardiness ...

The USDA Plant Hardiness Zone Map divides the United States and Canada into 13 zones, based on the average annual minimum winter temperature. Each zone is, on average, 10 degrees warmer or colder ...

Map developers from USDA and Oregon State University, updated the plant hardiness zoning for half of the country based on 30 years of climate data.

Across the lower 48 states, the lowest likely winter temperature overall is 2.5 degrees warmer than when the last map was published in 2012, according to Chris Daly, a researcher at Oregon State ...

Zone 9 and 10. These hardiness zones have average minimum winter temperatures between 20 degrees Fahrenheit and 40 degrees Fahrenheit, meaning many of the native plants are heat-loving and perfect ...

How cold it gets in winter where you garden is an important ... The USDA develops Plant Hardiness Zone Maps based on the average minimum temperatures experienced in different areas of the country.