Green Bay, WI · zone 5a · ~161 frost-free days
When to plant a garden in Green Bay.
In Green Bay, the typical last spring frost lands around May 2 and the first fall frost around Oct 10, giving you about 161 frost-free days. Cool-season crops go out before the last frost; warm-season crops wait until after it.
The 2026 windows
Sow dates for Green Bay, keyed to your frost.
| Crop | Start indoors | Spring sow / set out | Fall sow |
|---|---|---|---|
| Tomato, slicing | Mar 28 to May 28 | May 9 to Jul 9 | — |
| Lettuce, leaf | — | Mar 25 to May 9 | Jul 27 to Sep 25 |
| Carrot | — | Mar 25 to Apr 27 | Jul 15 to Aug 10 |
| Bush Bean | — | May 2 to Jun 22 | Jun 26 to Jul 29 |
| Cucumber, slicing | — | May 9 to Aug 8 | Jun 9 to Jul 10 |
| Pepper, bell | Apr 6 to May 28 | May 18 to Jul 9 | — |
| Kale | Feb 11 to Mar 11 | Mar 25 to Apr 22 | Jul 10 to Aug 25 |
| Spinach | — | Mar 11 to Apr 22 | Jul 27 to Sep 14 |
Green Bay sits in Zone 5a, but two gardens in the same city can be a week or two apart. The planner works from your ZIP code's frost dates, not the zone, so the dates land right for your block, not the metro average.
Build your Green Bay garden plan.
Tell the free planner what you want to eat and who you're feeding. It returns plant counts, spacing, and frost-safe sow dates for ZIP 54301 in about 60 seconds.