Colorado gardeners eyeing warmer USDA growing zones should be careful, experts say The map was updated for the first time since 2012, but don’t load up on heat-loving perennials just yet ...

Colorado gardeners eyeing the U.S. Department of Agriculture’s updated Plant Hardiness Zone Map, which moves much of the state in a warmer growing zone, should hold their horses — or trowels — before ...

The USDA’s zones are based on the average low winter temperature for an area. In Colorado, our zones range from the cold Zone 3a (-40 to -35 degrees F. ave. low winter temp) to our warmest Zone ...

Colorado gardeners eyeing the U.S. Department of Agriculture’s newly updated Plant Hardiness Zone Map, which now places much of the state in a warmer growing zone, should hold their horses ...