When to plant Brussels Sprouts in Zone 9a
In Zone 9a, Brussels Sprouts: start seeds indoors around Jan 17–Jan 31; transplant outdoors around Feb 21–Mar 7. Expect to harvest around Jun 1–Jun 15.
| Step | When |
|---|---|
| Start seeds indoors | Jan 17 – Jan 31 |
| Transplant outdoors | Feb 21 – Mar 7 |
| Harvest | Jun 1 – Jun 15 |
Tip: A long-season crop best for fall — the sprouts sweeten after a frost or two.
Zone 9a averages a last spring frost around Feb 28 and a first fall frost around Dec 5. These are zone averages — look up your ZIP for your exact area.
See the full Zone 9a calendar in the tool →