AHS Heat Zones
In addition to the USDA Hardiness zones there are the American Horticultural Society (AHS) Heat Zones.
The criterion is the average number of days per year when the temperature exceeds 30°C (86°F). The AHS Heat Zone Map for the US is available on the American Horticultural Society website.
| Zone | From | To |
| 1 | < 1 | |
| 2 | 1 | 7 |
| 3 | 8 | 14 |
| 4 | 15 | 30 |
| 5 | 31 | 45 |
| 6 | 46 | 60 |
| 7 | 61 | 90 |
| 8 | 91 | 120 |
| 9 | 121 | 150 |
| 10 | 151 | 180 |
| 11 | 181 | 210 |
| 12 | >210 | |
Read more about this topic: Hardiness Zone
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