When to plant sweet corn in Delaware
Delaware spans USDA zones 7a–7b, so the right time to plant sweet corn shifts by weeks across the state. The window to sow seed directly outdoors runs from about April 4 in Dover to April 11 in Milford — below are local dates for 11 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Direct sow |
|---|---|---|---|---|
| Wilmington | 7b | April 7 | November 4 | April 7 – April 21 |
| Dover | 7b | April 4 | November 4 | April 4 – April 18 |
| Newark | 7b | April 7 | November 2 | April 7 – April 21 |
| Middletown | 7b | April 7 | November 2 | April 7 – April 21 |
| Bear | 7b | April 7 | November 2 | April 7 – April 21 |
| Glasgow | 7b | April 7 | November 2 | April 7 – April 21 |
| Brookside | 7b | April 7 | November 2 | April 7 – April 21 |
| Hockessin | 7a | April 7 | November 4 | April 7 – April 21 |
Sweet Corn in Delaware: FAQ
When can I plant sweet corn in Delaware?
Across Delaware, the time to direct-sow sweet corn spans roughly April 4 in Dover to April 11 in Milford, each following that city's local frost dates.
Does the sweet corn planting date vary across Delaware?
Yes. Delaware publishes 11 cities with their own frost dates, so the right sweet corn 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 corn take to grow in Delaware?
Sweet Corn takes about 60–90 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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