When to plant Cauliflower in Zone 4a
In Zone 4a, Cauliflower: start seeds indoors around Mar 27–Apr 10; transplant outdoors around May 1–May 15. Expect to harvest around Jul 10–Jul 24.
| Step | When |
|---|---|
| Start seeds indoors | Mar 27 – Apr 10 |
| Transplant outdoors | May 1 – May 15 |
| Harvest | Jul 10 – Jul 24 |
Tip: Fussier than broccoli — it needs cool, even conditions. Blanch heads by tying leaves over them.
Zone 4a averages a last spring frost around May 15 and a first fall frost around Sep 18. These are zone averages — look up your ZIP for your exact area.
See the full Zone 4a calendar in the tool →