The USDA Plant Hardiness Zone Map is the standard by which gardeners and growers can determine which plants are most likely to thrive at a location. The map is based on the average annual minimum winter temperature, divided into 10-degree F zones.
While most gardeners and farmers have been aware of their specific growing zone, they may not be aware that the USDA have updated the plant hardiness zone map to reflect changes in zones due to climate change.
For instance, our zone here in the Denver area was 5a, and is now considered a 6a–one full zone change. Be sure to check your zone before planning your garden or farm this season!