When to plant Rosemary in Zone 10a
In Zone 10a, Rosemary: start seeds indoors around Nov 22–Dec 6; transplant outdoors around Feb 14–Feb 28. Expect to harvest around May 15–May 29.
| Step | When |
|---|---|
| Start seeds indoors | Nov 22 – Dec 6 |
| Transplant outdoors | Feb 14 – Feb 28 |
| Harvest | May 15 – May 29 |
Tip: Slow from seed and frost-tender in cold zones — most gardeners start from a plant and overwinter indoors.
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 →