Washington · zones 6b–9a
When to plant broccoli in Washington.
Sow or transplant between Feb 21 to Mar 21 in a typical year, keyed to Washington's median last frost around Apr 14. A second, fall sowing fits Jul 4 to Aug 13. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Broccoli dates for a typical Washington season.
1 · Start indoors
Jan 10 to Feb 7
About 6 weeks before set-out. Warm spot, real light.
2 · Set out
Feb 21 to Mar 21
Keyed to the ~Apr 14 last frost. Sow 0.5" deep, 18" apart.
Fall round
Jul 4 to Aug 13
Counted back from the ~Oct 18 first frost.
Harvest
~60 days later
~1.2 lb per plant over ~3 weeks.
Washington spans more than one climate: Zone 8 is the most common zone, but the state runs 6b to 9a. 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.