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 but apparently enough to make a difference...