When to plant sweet potato in Delaware
Delaware spans USDA zones 7a–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 Dover to May 2 in Milford — below are local dates for 11 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Transplant out |
|---|---|---|---|---|
| Wilmington | 7b | April 7 | November 4 | April 28 – May 12 |
| Dover | 7b | April 4 | November 4 | April 25 – May 9 |
| Newark | 7b | April 7 | November 2 | April 28 – May 12 |
| Middletown | 7b | April 7 | November 2 | April 28 – May 12 |
| Bear | 7b | April 7 | November 2 | April 28 – May 12 |
| Glasgow | 7b | April 7 | November 2 | April 28 – May 12 |
| Brookside | 7b | April 7 | November 2 | April 28 – May 12 |
| Hockessin | 7a | April 7 | November 4 | April 28 – May 12 |
Sweet Potato in Delaware: FAQ
When can I plant sweet potato in Delaware?
Across Delaware, the time to transplant sweet potato spans roughly April 25 in Dover to May 2 in Milford, each following that city's local frost dates.
Does the sweet potato planting date vary across Delaware?
Yes. Delaware publishes 11 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 Delaware?
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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