When to plant Cauliflower in Zone 3b
In Zone 3b, Cauliflower: start seeds indoors around Apr 1–Apr 15; transplant outdoors around May 6–May 20. Expect to harvest around Jul 15–Jul 29.
| Step | When |
|---|---|
| Start seeds indoors | Apr 1 – Apr 15 |
| Transplant outdoors | May 6 – May 20 |
| Harvest | Jul 15 – Jul 29 |
Tip: Fussier than broccoli — it needs cool, even conditions. Blanch heads by tying leaves over them.
Zone 3b averages a last spring frost around May 20 and a first fall frost around Sep 12. These are zone averages — look up your ZIP for your exact area.
See the full Zone 3b calendar in the tool →