Michigan planting zones & frost dates
The 15 Michigan cities on this site fall in zones 6a, 6b. Last spring frost dates range from Apr 27 in Warren to May 11 in Ann Arbor.
| City | Zone | Last frost | First frost | Population |
|---|---|---|---|---|
| Detroit | 6b | May 2 | Oct 20 | 645,705 |
| Grand Rapids | 6a | May 4 | Oct 13 | 200,117 |
| Warren | 6b | Apr 27 | Oct 24 | 137,686 |
| Sterling Heights | 6b | May 5 | Oct 18 | 134,342 |
| Ann Arbor | 6a | May 11 | Oct 4 | 122,925 |
| Lansing | 6a | May 7 | Oct 6 | 114,336 |
| Dearborn | 6b | May 8 | Oct 9 | 106,377 |
| Livonia | 6b | May 8 | Oct 10 | 93,113 |
| Troy | 6b | May 2 | Oct 16 | 89,209 |
| Farmington Hills | 6a | May 8 | Oct 10 | 84,173 |
| Westland | 6b | Apr 28 | Oct 22 | 82,745 |
| Flint | 6a | May 10 | Oct 7 | 79,735 |
| Wyoming | 6a | May 4 | Oct 13 | 78,559 |
| Rochester Hills | 6a | May 2 | Oct 16 | 78,330 |
| Southfield | 6b | May 8 | Oct 10 | 76,874 |
Frost dates are 30%-risk dates from the nearest suitable NOAA station. Population: Census Vintage 2024 estimates.