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USDA hardiness zones & frost dates
Each USDA hardiness zone has its own average frost dates and growing season. Pick your zone for a full planting calendar — or enter your ZIP on the home page to find it automatically.
| Zone | Last frost | First frost | Season | Stations |
|---|---|---|---|---|
| Zone 10a | ~01/15 | ~12/02 | 365 days | 47 |
| Zone 10b | ~01/20 | ~01/25 | 365 days | 6 |
| Zone 2a | ~05/17 | ~09/07 | 113 days | 3 |
| Zone 2b | ~05/25 | ~09/15 | 115 days | 4 |
| Zone 3b | ~05/20 | ~09/19 | 121 days | 11 |
| Zone 4a | ~05/14 | ~09/27 | 134 days | 26 |
| Zone 4b | ~05/10 | ~09/30 | 141 days | 51 |
| Zone 5a | ~05/12 | ~10/01 | 141 days | 69 |
| Zone 5b | ~05/04 | ~10/08 | 157 days | 70 |
| Zone 6a | ~04/30 | ~10/15 | 170 days | 112 |
| Zone 6b | ~04/23 | ~10/20 | 179 days | 126 |
| Zone 7a | ~04/15 | ~10/26 | 193 days | 104 |
| Zone 7b | ~04/06 | ~11/01 | 210 days | 69 |
| Zone 8a | ~03/26 | ~11/08 | 227 days | 91 |
| Zone 8b | ~03/16 | ~11/15 | 245 days | 115 |
| Zone 9a | ~03/02 | ~11/25 | 268 days | 75 |
| Zone 9b | ~02/02 | ~12/08 | 317 days | 61 |