When to plant Brussels Sprouts in Zone 10a
In Zone 10a, Brussels Sprouts: start seeds indoors around Dec 20–Jan 3; transplant outdoors around Jan 24–Feb 7. Expect to harvest around May 4–May 18.
| Step | When |
|---|---|
| Start seeds indoors | Dec 20 – Jan 3 |
| Transplant outdoors | Jan 24 – Feb 7 |
| Harvest | May 4 – May 18 |
Tip: A long-season crop best for fall — the sprouts sweeten after a frost or two.
Zone 10a averages a last spring frost around Jan 31 and a first fall frost around Dec 28. These are zone averages — look up your ZIP for your exact area.
See the full Zone 10a calendar in the tool →