Connecticut · zones 6a–7a
When to plant basil in Connecticut.
Sow or transplant between May 13 to Jul 29 in a typical year, keyed to Connecticut's median last frost around Apr 22. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Basil dates for a typical Connecticut season.
1 · Start indoors
Apr 1 to Jun 17
About 6 weeks before set-out. Warm spot, real light.
2 · Set out
May 13 to Jul 29
Keyed to the ~Apr 22 last frost. Sow 0.25" deep, 8" apart.
Harvest
~40 days later
~0.5 lb per plant over ~12 weeks.
Connecticut spans more than one climate: Zone 6 is the most common zone, but the state runs 6a to 7a. 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.