plant hardiness zones

Plant Hardiness Zones Revised, First Time In 20 Years
Plant hardiness zones have been adjusted by the USDA and Casper, Wyoming is moving up.
Horticulturalist, Donna Cuin, at the U-W Agricultural Extension office in Casper says the new map has moved us from a 4-b to 5-a. That means we've been upgraded from a low of 25 below zero to 20 below- subtle …