When to plant Cauliflower in Zone 4b
In Zone 4b, Cauliflower: start seeds indoors around Mar 22–Apr 5; transplant outdoors around Apr 26–May 10. Expect to harvest around Jul 5–Jul 19.
| Step | When |
|---|---|
| Start seeds indoors | Mar 22 – Apr 5 |
| Transplant outdoors | Apr 26 – May 10 |
| Harvest | Jul 5 – Jul 19 |
Tip: Fussier than broccoli — it needs cool, even conditions. Blanch heads by tying leaves over them.
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 →