Indiana · zones 5b–6b
When to plant spinach in Indiana.
Sow between Mar 1 to Apr 12 in a typical year, keyed to Indiana's median last frost around Apr 22. A second, fall sowing fits Aug 3 to Sep 21. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Spinach dates for a typical Indiana season.
Direct sow
Mar 1 to Apr 12
Keyed to the ~Apr 22 last frost. Sow 0.5" deep, 3" apart.
Fall round
Aug 3 to Sep 21
Counted back from the ~Oct 17 first frost.
Harvest
~42 days later
~0.25 lb per plant over ~1 weeks.
Indiana spans more than one climate: Zone 6 is the most common zone, but the state runs 5b 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.