About Zones

Zones are a very rough guide as to where a plant will live. This zoning is from the RHS Index of Garden Plants. Microclimates may exist in your area or even around your house that will allow you to grow a plant a zone or two above your average. But do not forget to mulch your roses very well when you are living in a low, cold zone. Experiment!

Zone
F
C
1
< -50
<-45.5
2
-50 to-40
-45.5 to-40.1
3
-40 to -30
-40.0 to -34.5
4
-30 to -20
-34.4 to -28.9
5
-20 to -10
-28.8 to -23.4
6
-10 to    0
-23.3 to -17.8
7
0 to +10
-17.7 to -12.3
8
+10 to +20
-12.2 to -6.7
9
+20 to +30
-6.6   to -1.2
10
+30 to +40
-1.1 to +4.4
11
> +40 
> +4.4