When to plant Brussels Sprouts in Zone 9b
In Zone 9b, Brussels Sprouts: start seeds indoors around Jan 4–Jan 18; transplant outdoors around Feb 8–Feb 22. Expect to harvest around May 19–Jun 2.
| Step | When |
|---|---|
| Start seeds indoors | Jan 4 – Jan 18 |
| Transplant outdoors | Feb 8 – Feb 22 |
| Harvest | May 19 – Jun 2 |
Tip: A long-season crop best for fall — the sprouts sweeten after a frost or two.
Zone 9b averages a last spring frost around Feb 15 and a first fall frost around Dec 15. These are zone averages — look up your ZIP for your exact area.
See the full Zone 9b calendar in the tool →