Iowa · zones 4b–6a
When to plant snap peas in Iowa.
Sow between Mar 10 to Apr 21 in a typical year, keyed to Iowa's median last frost around May 1. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Snap Peas dates for a typical Iowa season.
Direct sow
Mar 10 to Apr 21
Keyed to the ~May 1 last frost. Sow 1" deep, 2" apart.
Harvest
~62 days later
~0.4 lb per plant over ~3 weeks.
Iowa spans more than one climate: Zone 5 is the most common zone, but the state runs 4b to 6a. 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.