When to plant Cauliflower in Zone 3a
In Zone 3a, Cauliflower: start seeds indoors around Apr 6–Apr 20; transplant outdoors around May 11–May 25. Expect to harvest around Jul 20–Aug 3.
| Step | When |
|---|---|
| Start seeds indoors | Apr 6 – Apr 20 |
| Transplant outdoors | May 11 – May 25 |
| Harvest | Jul 20 – Aug 3 |
Tip: Fussier than broccoli — it needs cool, even conditions. Blanch heads by tying leaves over them.
Zone 3a averages a last spring frost around May 25 and a first fall frost around Sep 8. These are zone averages — look up your ZIP for your exact area.
See the full Zone 3a calendar in the tool →