When to plant Spinach in Zone 4b
In Zone 4b, Spinach: direct sow outdoors around Mar 29–Apr 26; direct sow outdoors around Jul 28–Aug 18. Expect to harvest around May 8–Jun 5.
| Step | When |
|---|---|
| Direct sow outdoors | Mar 29 – Apr 26 |
| Direct sow outdoors | Jul 28 – Aug 18 |
| Harvest | May 8 – Jun 5 |
| Harvest | Sep 6 – Sep 27 |
Tip: Very cold-hardy; sow as soon as soil can be worked, and again in fall. Bolts in heat.
Zone 4b averages a last spring frost around May 10 and a first fall frost around Sep 22. These are zone averages — look up your ZIP for your exact area.
See the full Zone 4b calendar in the tool →