It’s important to know when frost could damage your plants. Although frost may come later than the first frost date or end sooner than the last frost date, this table will give you a good guideline to help plan your garden.
| USDA Hardiness zone |
First frost date | Last frost date |
| 1 | July 15th | June 15th |
| 2 | August 15th | May 15th |
| 3 | September 15th | May 15th |
| 4 | September 15th | May 15th |
| 5 | October 15th | April 15th |
| 6 | October 15th | April 15th |
| 7 | October 15th | April 15th |
| 8 | November 15th | March 15th |
| 9 | December 15th | February 15th |
| 10 | December 15th | January 31st |
| 11 | No frost | No frost |
If you don’t know what hardiness zone you are in, you can visit the USDA Web site and enter your zip code to find out.