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When to plant rosemary in Delaware

Delaware spans USDA zones 7a–7b, so the right time to plant rosemary shifts by weeks across the state. The window to transplant seedlings outdoors runs from about April 11 in Dover to April 18 in Milford — below are local dates for 11 cities, each computed from its own frost dates.

In Wilmingtonthe rosemary transplant out window (April 14–April 21) has passed for this year.
CityZoneLast frostFirst frostTransplant out
Wilmington7bApril 7November 4April 14 – April 21
Dover7bApril 4November 4April 11 – April 18
Newark7bApril 7November 2April 14 – April 21
Middletown7bApril 7November 2April 14 – April 21
Bear7bApril 7November 2April 14 – April 21
Glasgow7bApril 7November 2April 14 – April 21
Brookside7bApril 7November 2April 14 – April 21
Hockessin7aApril 7November 4April 14 – April 21

Rosemary in Delaware: FAQ

When can I plant rosemary in Delaware?

Across Delaware, the time to transplant rosemary spans roughly April 11 in Dover to April 18 in Milford, each following that city's local frost dates.

Does the rosemary planting date vary across Delaware?

Yes. Delaware publishes 11 cities with their own frost dates, so the right rosemary planting window shifts by weeks between the warmest and coldest parts of the state — use your city's page for the exact dates.

Planting reminders

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An email when it’s time to start seeds, transplant, and sow — timed to your frost dates. Double opt-in, one-click unsubscribe, no spam.

Rosemary planting guide →All Delaware cities →Delaware planting calendar →
When to Plant Rosemary in Delaware — Frost-Based Dates by City — BlissGarden