Washington DC · zones 7b–7b
When to plant zucchini in Washington DC.
Sow between Apr 12 to Jul 26 in a typical year, keyed to Washington DC's median last frost around Apr 5. A second, fall sowing fits Jul 25 to Aug 13. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Zucchini dates for a typical Washington DC season.
Direct sow
Apr 12 to Jul 26
Keyed to the ~Apr 5 last frost. Sow 1" deep, 24" apart.
Fall round
Jul 25 to Aug 13
Counted back from the ~Nov 8 first frost.
Harvest
~50 days later
~8 lb per plant over ~5 weeks.
Washington DC 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.