Climatic Zonal Chart of the United States
USDA Hardiness Zones Average Minimum Temperature
Zone 1 -- Below -50° Zone 2 -- -40 to -50° Zone 3 -- -30 to -40° Zone 4 -- -20° to -30° Zone 5 -- -10° to -20° Zone 6 -- 0° to -10° Zone 7 -- 10° to 0° Zone 8 -- 20° to 10° Zone 9 -- 30° to 20° Zone 10 -- 40° to 30°
