When choosing plants for your garden, select the plants best suited to your climate. Know your USDA hardiness zone and use this chart to determine the time and length of your growing season.
| Zone | Minimum Temperature (°F/°C) | Last Frost Date | First Frost Date | Typical Number of Frost-Free Days |
|---|---|---|---|---|
| 1 | Below –50°F Below –46°C | June 15 | July 15 | 30 |
| 2 | –50°F to –40°F –46°C to –40°C | May 15 | August 15 | 90 |
| 3 | –40°F to –30°F –40°C to –34°C | May 15 | September 15 | 120 |
| 4 | –30F to –20F –34° to –29°C | May 10 | September 15 | 125 |
| 5 | –20°F to –10°F –29°C to –23°C | April 30 | October 15 | 165 |
| 6 | –10°F to 0°F –23°C to –18°C | April 15 | October 15 | 180 |
| 7 | 0°F to 10°F –23°C to –12°C | April 15 | October 15 | 180 |
| 8 | 10°F to 20°F –12°C to –7°C | March 10 | November 15 | 245 |
| 9 | 20°F to 30°F –7°C to –1°C | February 15 | December 15 | 265 |
| 10 | 30°F to 40°F –1°C to 4°C | January 20 | December 20 | 335 |
| 11 | 40°F and up 4°C and up | Frost free | Frost free | 365 |
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Source:http://www.dummies.com/how-to/content/gardening-by-usda-plant-hardiness-zones.html
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