When to plant sweet potato in Michigan
Michigan spans USDA zones 4b–6b, so the right time to plant sweet potato shifts by weeks across the state. The window to transplant seedlings outdoors runs from about May 10 in Port Huron to June 9 in Cadillac — below are local dates for 101 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Transplant out |
|---|---|---|---|---|
| Detroit | 6b | April 27 | October 25 | May 18 – June 1 |
| Grand Rapids | 6a | May 6 | October 10 | May 27 – June 10 |
| Warren | 6b | April 21 | October 31 | May 12 – May 26 |
| Sterling Heights | 6b | April 30 | October 24 | May 21 – June 4 |
| Ann Arbor | 6a | May 5 | October 10 | May 26 – June 9 |
| Lansing | 6a | May 1 | October 13 | May 22 – June 5 |
| Dearborn | 6b | May 1 | October 15 | May 22 – June 5 |
| Livonia | 6b | May 1 | October 17 | May 22 – June 5 |
Sweet Potato in Michigan: FAQ
When can I plant sweet potato in Michigan?
Across Michigan, the time to transplant sweet potato spans roughly May 10 in Port Huron to June 9 in Cadillac, each following that city's local frost dates.
Does the sweet potato planting date vary across Michigan?
Yes. Michigan publishes 101 cities with their own frost dates, so the right sweet potato planting window shifts by weeks between the warmest and coldest parts of the state — use your city's page for the exact dates.
How long does sweet potato take to grow in Michigan?
Sweet Potato takes about 90–120 days to reach harvest once planted — check that this fits inside your city's frost-free season on its place page.
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