When to plant sweet potato in Massachusetts
Massachusetts spans USDA zones 5b–7b, so the right time to plant sweet potato shifts by weeks across the state. The window to transplant seedlings outdoors runs from about April 25 in Boston to May 31 in North Adams — below are local dates for 89 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Transplant out |
|---|---|---|---|---|
| Boston | 7a | April 4 | November 9 | April 25 – May 9 |
| Worcester | 6a | April 23 | October 21 | May 14 – May 28 |
| Springfield | 6a | May 3 | October 8 | May 24 – June 7 |
| Cambridge | 6b | April 19 | October 23 | May 10 – May 24 |
| Lowell | 6b | April 30 | October 10 | May 21 – June 4 |
| Brockton | 6b | April 22 | October 19 | May 13 – May 27 |
| Quincy | 7a | April 25 | October 22 | May 16 – May 30 |
| Lynn | 7a | April 25 | October 20 | May 16 – May 30 |
Sweet Potato in Massachusetts: FAQ
When can I plant sweet potato in Massachusetts?
Across Massachusetts, the time to transplant sweet potato spans roughly April 25 in Boston to May 31 in North Adams, each following that city's local frost dates.
Does the sweet potato planting date vary across Massachusetts?
Yes. Massachusetts publishes 89 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 Massachusetts?
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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