When to plant Broccoli in Zone 3b
In Zone 3b, Broccoli: start seeds indoors around Apr 1–Apr 15; transplant outdoors around May 6–May 20; direct sow outdoors around Jun 6–Jun 27. Expect to harvest around Jul 10–Jul 24.
| Step | When |
|---|---|
| Start seeds indoors | Apr 1 – Apr 15 |
| Transplant outdoors | May 6 – May 20 |
| Direct sow outdoors | Jun 6 – Jun 27 |
| Harvest | Jul 10 – Jul 24 |
| Harvest | Aug 10 – Aug 31 |
Tip: A cool-season brassica. Transplant in early spring or late summer; it bolts in midsummer heat.
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 →