When to plant sweet potato in Maryland
Maryland spans USDA zones 7a–8a, so the right time to plant sweet potato shifts by weeks across the state. The window to transplant seedlings outdoors runs from about April 12 in California to May 15 in Westminster — below are local dates for 139 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Transplant out |
|---|---|---|---|---|
| Baltimore | 8a | March 24 | November 21 | April 14 – April 28 |
| Columbia | 7b | April 5 | November 9 | April 26 – May 10 |
| Germantown | 7b | April 14 | October 29 | May 5 – May 19 |
| Frederick | 7b | April 2 | November 6 | April 23 – May 7 |
| Waldorf | 7b | April 17 | October 27 | May 8 – May 22 |
| Silver Spring | 7b | April 10 | November 1 | May 1 – May 15 |
| Ellicott City | 7b | April 2 | November 7 | April 23 – May 7 |
| Glen Burnie | 7b | April 10 | October 31 | May 1 – May 15 |
Sweet Potato in Maryland: FAQ
When can I plant sweet potato in Maryland?
Across Maryland, the time to transplant sweet potato spans roughly April 12 in California to May 15 in Westminster, each following that city's local frost dates.
Does the sweet potato planting date vary across Maryland?
Yes. Maryland publishes 139 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 Maryland?
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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