Cumberland New USDA Plant Hardiness Zone Map reflects warmer growing climates with increased accuracy Updated: Jun. 17, 2012, 9:19 a.m. | Published: Jun. 17, 2012, 8: ...

There are 13 full zones (with 1 being the coldest and 13 being the warmest). Each full zone is also divided into half zones. The USDA draws the map using a color-coded key for easier reference.

According to the USDA, the map is also based on 30-year averages of the lowest annual winter temperatures at the specific locations, and split into 10-degree and 5-degree zones and integrates data ...

CORVALLIS — The U.S. Department of Agriculture released its new Plant Hardiness Zone Map, the national standard by which gardeners can determine which plants are most likely to survive the ...

See the latest from Dr. Jeff Masters and Bob Henson here. New USDA Plant Hardiness Zone Map for gardeners shows a warming climate By: Dr. Jeff Masters, 2:17 PM GMT on February 01, 2012 ...

Home gardeners use something called the U.S. Department of Agriculture's "Plant Hardiness Map," which slices up the country into 13 color-coded, numbered zones (and those are divided into half ...

The map, which divides the U.S. into zones based on an area’s annual coldest temperature, shows that much of Vermont has shifted into warmer hardiness zones.

Henry T. Skinner, the second director of the U.S. National Arboretum, released the first “Plant Hardiness Zone Map” in 1960.