When to plant zucchini in Michigan
Michigan spans USDA zones 4b–6b, so the right time to plant zucchini shifts by weeks across the state. The window to transplant seedlings outdoors runs from about April 26 in Port Huron to May 26 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 4 – May 11 |
| Grand Rapids | 6a | May 6 | October 10 | May 13 – May 20 |
| Warren | 6b | April 21 | October 31 | April 28 – May 5 |
| Sterling Heights | 6b | April 30 | October 24 | May 7 – May 14 |
| Ann Arbor | 6a | May 5 | October 10 | May 12 – May 19 |
| Lansing | 6a | May 1 | October 13 | May 8 – May 15 |
| Dearborn | 6b | May 1 | October 15 | May 8 – May 15 |
| Livonia | 6b | May 1 | October 17 | May 8 – May 15 |
Zucchini in Michigan: FAQ
When can I plant zucchini in Michigan?
Across Michigan, the time to transplant zucchini spans roughly April 26 in Port Huron to May 26 in Cadillac, each following that city's local frost dates.
Does the zucchini planting date vary across Michigan?
Yes. Michigan publishes 101 cities with their own frost dates, so the right zucchini 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 zucchini take to grow in Michigan?
Zucchini takes about 45–60 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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