When to plant Broccoli in Zone 5b
In Zone 5b, Broccoli: start seeds indoors around Mar 12–Mar 26; transplant outdoors around Apr 16–Apr 30; direct sow outdoors around Jun 29–Jul 20. Expect to harvest around Jun 20–Jul 4.
| Step | When |
|---|---|
| Start seeds indoors | Mar 12 – Mar 26 |
| Transplant outdoors | Apr 16 – Apr 30 |
| Direct sow outdoors | Jun 29 – Jul 20 |
| Harvest | Jun 20 – Jul 4 |
| Harvest | Sep 2 – Sep 23 |
Tip: A cool-season brassica. Transplant in early spring or late summer; it bolts in midsummer heat.
Zone 5b averages a last spring frost around Apr 30 and a first fall frost around Oct 5. These are zone averages — look up your ZIP for your exact area.
See the full Zone 5b calendar in the tool →