Oregon · zones 6a–9a
When to plant spinach in Oregon.
Sow between Feb 22 to Apr 5 in a typical year, keyed to Oregon's median last frost around Apr 15. A second, fall sowing fits Aug 11 to Sep 29. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Spinach dates for a typical Oregon season.
Direct sow
Feb 22 to Apr 5
Keyed to the ~Apr 15 last frost. Sow 0.5" deep, 3" apart.
Fall round
Aug 11 to Sep 29
Counted back from the ~Oct 25 first frost.
Harvest
~42 days later
~0.25 lb per plant over ~1 weeks.
Oregon spans more than one climate: Zone 8 is the most common zone, but the state runs 6a 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.