Michigan · zones 4b–6b
When to plant spinach in Michigan.
Sow between Mar 14 to Apr 25 in a typical year, keyed to Michigan's median last frost around May 5. A second, fall sowing fits Jul 25 to Sep 12. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Spinach dates for a typical Michigan season.
Direct sow
Mar 14 to Apr 25
Keyed to the ~May 5 last frost. Sow 0.5" deep, 3" apart.
Fall round
Jul 25 to Sep 12
Counted back from the ~Oct 8 first frost.
Harvest
~42 days later
~0.25 lb per plant over ~1 weeks.
Michigan spans more than one climate: Zone 6 is the most common zone, but the state runs 4b to 6b. 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.