Delaware · zones 7b–7b
When to plant basil in Delaware.
Sow or transplant between May 3 to Jul 19 in a typical year, keyed to Delaware's median last frost around Apr 12. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Basil dates for a typical Delaware season.
1 · Start indoors
Mar 22 to Jun 7
About 6 weeks before set-out. Warm spot, real light.
2 · Set out
May 3 to Jul 19
Keyed to the ~Apr 12 last frost. Sow 0.25" deep, 8" apart.
Harvest
~40 days later
~0.5 lb per plant over ~12 weeks.
Delaware spans more than one climate: Zone 7 is the most common zone, but the state runs 7b to 7b. That's why the planner works from your ZIP code's frost dates, not your zone — mountain and coastal gardens in the same state can be three weeks apart.