Frost dates across Minnesota
Typical last spring frost, first fall frost, and USDA zone for 14 Minnesota cities, from 30-year NOAA climate normals. Every date is a 50 percent odds line, not a promise. Pick a city for the full frost window and what is plantable there now.
Not on the list? Any Minnesota ZIP works.
| City | Last spring frost | First fall frost | Season length | Zone |
|---|---|---|---|---|
| Minneapolis | Apr 23 | Oct 16 | about 176 days | 5a |
| Saint Paul | Apr 25 | Oct 12 | about 170 days | 5a |
| Rochester | Apr 30 | Oct 6 | about 159 days | 4b |
| Duluth | May 14 | Oct 12 | about 151 days | 4a |
| Saint Cloud | May 7 | Sep 30 | about 146 days | 4b |
| Mankato | Apr 30 | Oct 9 | about 162 days | 5a |
| Moorhead | May 5 | Oct 3 | about 151 days | 4a |
| Willmar | Apr 30 | Oct 7 | about 160 days | 4b |
| Hibbing | Jun 5 | Sep 8 | about 95 days | 3b |
| Bemidji | May 17 | Sep 26 | about 132 days | 3b |
| Alexandria | May 2 | Oct 8 | about 159 days | 4b |
| Brainerd | May 13 | Sep 27 | about 137 days | 4a |
| Worthington | May 3 | Oct 4 | about 154 days | 5a |
| Marshall | May 5 | Oct 3 | about 151 days | 5a |
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