The USDA draws the map using a color-coded key for easier reference. ... The graphic below shows the widespread changes in half-zone areas because of long-term temperature changes.

The USDA has access to thousands more weather stations now than in the past. That, combined with 30 years of new data, led to big changes in its hardiness map of cold winter temperatures in Kansas.

With spring on the horizon, many gardeners are preparing for prolonged, hearty growing seasons in their region. The United States has a diverse ecological footprint, so growing seasons differ slightly ...

The Tennessee counties included in the contiguous areas area: Hardin, Wayne, Lawrence, Giles, Lincoln and Franklin. You can view the map from the USDA below. (Photo: USDA) ...