The University of Arkansas Extension Services gives the following examples of specific regional changes: The 175 mile change occurred in only 22 years, showing a substantial shift in what crops and plants are viable across Arkansas. In 2012, the USDA published the newest hardiness zone map for the United States which showed that, in general, the boundaries of hardiness zones had shifted north by approximately two-and-a-half degrees of latitude (about 175 miles). Farmers must grow crops suited for their hardiness zone and when zones shift, substantial changes may be required in farming practices, planting and harvesting schedules, and even in the types of crops one can grow. Hardiness zones tell the average minimum winter temperature in a region, a necessary metric for determining what plants can grow or thrive. Hardiness zones maps are an easy and reliable way for farmers and gardeners to know when and what to plant.
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