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Zone Map of Western USA
| Zone 1 | Below
-45°C Below -50°F |
Zone 7 | -18°C/-12°C 0°F/+10°F |
| Zone 2 | -45°C/-40°C -50°F/-40°F |
Zone 8 | -12°C/-7°C +10°F/+20°F |
| Zone 3 | -40°C/-34°C -40°F/-30°F |
Zone 9 | -7°C/-1°C +20°F/+30°F |
| Zone 4 | -34°C/-29°C -30°F/-20°F |
Zone 10 | -1°C/+4°C +30°F/+40°F |
| Zone 5 | -29°C/-23°C -20°F/-10°F |
Zone 11 | Above
+4°C Above +40°F |
| Zone 6 | -23°C/-18°C -10°F/0°F |
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