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Frost dates by zone and state
Your average last spring frost decides when it is safe to plant tender crops; the first fall frost ends the season. The table shows the median dates for each USDA hardiness zone, from 1045 NOAA weather stations.
| Zone | Avg. last spring frost | Avg. first fall frost | Frost-free days | Stations |
|---|---|---|---|---|
| Zone 2a | May 20 | Sep 9 | 112 | 6 |
| Zone 3b | May 17 | Sep 23 | 129 | 9 |
| Zone 4a | May 15 | Sep 26 | 134 | 28 |
| Zone 4b | May 13 | Sep 29 | 139 | 55 |
| Zone 5a | May 11 | Oct 1 | 143 | 78 |
| Zone 5b | May 5 | Oct 8 | 156 | 73 |
| Zone 6a | Apr 30 | Oct 15 | 168 | 112 |
| Zone 6b | Apr 24 | Oct 19 | 178 | 138 |
| Zone 7a | Apr 15 | Oct 25 | 194 | 104 |
| Zone 7b | Apr 6 | Nov 1 | 209 | 78 |
| Zone 8a | Mar 27 | Nov 7 | 224 | 92 |
| Zone 8b | Mar 16 | Nov 15 | 244 | 119 |
| Zone 9a | Mar 2 | Nov 26 | 268 | 80 |
| Zone 9b | Feb 4 | Dec 10 | 309 | 55 |
| Zone 10a | Jan 8 | Dec 24 | 351 | 18 |
Frost dates by state
- Alabama
last frost ~Mar 18 - Alaska
last frost ~May 17 - Arizona
last frost ~Apr 2 - Arkansas
last frost ~Mar 24 - California
last frost ~Feb 11 - Colorado
last frost ~May 6 - Connecticut
last frost ~Apr 19 - Delaware
last frost ~Apr 6 - Florida
last frost ~Mar 1 - Georgia
last frost ~Mar 17 - Hawaii
last frost ~Apr 12 - Idaho
last frost ~May 16 - Illinois
last frost ~Apr 16 - Indiana
last frost ~Apr 16 - Iowa
last frost ~Apr 26 - Kansas
last frost ~Apr 16 - Kentucky
last frost ~Apr 6 - Louisiana
last frost ~Mar 1 - Maine
last frost ~May 7 - Maryland
last frost ~Apr 7 - Massachusetts
last frost ~Apr 28 - Michigan
last frost ~May 7 - Minnesota
last frost ~May 13 - Mississippi
last frost ~Mar 14 - Missouri
last frost ~Apr 9 - Montana
last frost ~May 18 - Nebraska
last frost ~May 1 - Nevada
last frost ~May 9 - New Hampshire
last frost ~May 7 - New Jersey
last frost ~Apr 14 - New Mexico
last frost ~Apr 27 - New York
last frost ~May 1 - North Carolina
last frost ~Mar 27 - North Dakota
last frost ~May 14 - Ohio
last frost ~Apr 22 - Oklahoma
last frost ~Apr 4 - Oregon
last frost ~Apr 15 - Pennsylvania
last frost ~Apr 23 - Rhode Island
last frost ~Apr 11 - South Carolina
last frost ~Mar 19 - South Dakota
last frost ~May 6 - Tennessee
last frost ~Apr 3 - Texas
last frost ~Mar 7 - Utah
last frost ~May 6 - Vermont
last frost ~May 12 - Virginia
last frost ~Apr 2 - Washington
last frost ~Apr 11 - West Virginia
last frost ~Apr 22 - Wisconsin
last frost ~May 2 - Wyoming
last frost ~May 22