When to plant Basil in Zone 10a
In Zone 10a, Basil: start seeds indoors around Dec 20–Jan 3; transplant outdoors around Feb 7–Feb 21. Expect to harvest around Apr 8–Apr 22.
| Step | When |
|---|---|
| Start seeds indoors | Dec 20 – Jan 3 |
| Transplant outdoors | Feb 7 – Feb 21 |
| Harvest | Apr 8 – Apr 22 |
Tip: Extremely frost-sensitive. Keep indoors until nights are reliably warm, then pinch often.
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 →