Frost dates across Michigan
Typical last spring frost, first fall frost, and USDA zone for 12 Michigan 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 Michigan ZIP works.
| City | Last spring frost | First fall frost | Season length | Zone |
|---|---|---|---|---|
| Detroit | Apr 27 | Oct 25 | about 181 days | 6b |
| Grand Rapids | May 6 | Oct 10 | about 157 days | 6a |
| Warren | Apr 21 | Oct 31 | about 193 days | 6b |
| Sterling Heights | Apr 21 | Oct 31 | about 193 days | 6b |
| Ann Arbor | May 8 | Oct 4 | about 149 days | 6a |
| Lansing | May 1 | Oct 13 | about 165 days | 6a |
| Portage | Apr 28 | Oct 18 | about 173 days | 6a |
| Saginaw | Apr 29 | Oct 21 | about 175 days | 6a |
| Marquette | May 8 | Oct 21 | about 166 days | 5b |
| Traverse City | May 12 | Oct 16 | about 157 days | 6a |
| Escanaba | May 13 | Oct 7 | about 147 days | 5a |
| Alpena | May 5 | Oct 17 | about 165 days | 5b |
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