USDA PLANT HARDINESS MAP

Approximate range of average annual minimum temperatures for each zone.

 Degrees F

Zone

 Degrees C
 Below -50 Zone 1 Below -45
-50 to -40  Zone 2  -45 to -40
-40 to -30  Zone 3  -40 to -34.5
-30 to -20 Zone 4  -34.4 to -28.9
-20 to -10 Zone 5  -28.8 to -23.4
-10 to 0 Zone 6  -23.3 to -17.8
0 to +10 Zone 7  -17.7 to -12.3
10 to 20 Zone 8  -12.2 to -6.7
20 to 30 Zone 9  -6.6 to -1.2
30 to 40 Zone 10  -1.1 to +4.4