Washington DC · zones 7b–7b
When to plant cucumbers in Washington DC.
Sow between Apr 12 to Jul 12 in a typical year, keyed to Washington DC's median last frost around Apr 5. A second, fall sowing fits Jul 8 to Aug 8. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Cucumbers dates for a typical Washington DC season.
Direct sow
Apr 12 to Jul 12
Keyed to the ~Apr 5 last frost. Sow 1" deep, 12" apart.
Fall round
Jul 8 to Aug 8
Counted back from the ~Nov 8 first frost.
Harvest
~60 days later
~5 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.