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Last Frost usually January 31 or before First
Frost usually November 30-December 31 |
Columns show Low Temperature Ranges
| USDA | Fahrenheit | Celsius | USDA | Fahrenheit | Celsius | Sunset Magazine Zone 2A includes the eastern plains of Colorado, the mountain areas of the southwest, eastern Washington, lower Idaho, upper Utah and Nevada and the isolated island mountains of the southwest. Winter temperatures range between 10 ° and 20 ° F with extremes between – 20 ° and – 30 ° F. The growing season varies from 100 to 150 days. |
| 1 | Below -50 | Below -45.6 | 6b | -5 0 | -17.8 -20.5 | |
| 2a | -50 -45 | -42.8 -45.5 | 7a | 0 5 | -15.0 -17.7 | |
| 2b | -45 -40 | -40.0 -42.7 | 7b | 5 10 | -12.3 -14.9 | |
| 3a | -40 -35 | -37.3 -39.9 | 8a | 10 15 | -9.5 -12.2 | |
| 3b | -35 -30 | -34.5 -37.2 | 8b | 15 20 | -6.7 -9.4 | |
| 4a | -30 -25 | -31.7 -34.4 | 9a | 20 25 | -3.9 -6.6 | |
| 4b | -25 -20 | -28.9 -31.6 | 9b | 25 30 | -1.2 -3.8 | |
| 5a | -20 -15 | -26.2 -28.8 | 10a | 30 35 | 1.6 -1.1 | |
| 5b | -15 -10 | -23.4 -26.1 | 10b | 35 40 | 4.4 1.7 | |
| 6a | -10 -5 | -20.6 -23.3 | 11 | above 40 | above 4.5 |
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Return Home Mountain States Wholesale Nursery webmaster george@mswn.com January 05, 2009 |