The map is meant for horticulture, not agriculture, said Chris Kucharik, a plant and agrosystem sciences professor at the University of Wisconsin-Madison, because farmers in the Midwest have largely been planting the same crops for decades.
Since the last map was released in 2012, all of Wisconsin’s hardiness zones have shifted about half a zone warmer, said Laura Jull, associate professor in the plant and agrosystem sciences department at UW-Madison.