When to plant Rosemary in Zone 9a
In Zone 9a, Rosemary: start seeds indoors around Dec 20–Jan 3; transplant outdoors around Mar 14–Mar 28. Expect to harvest around Jun 12–Jun 26.
| Step | When |
|---|---|
| Start seeds indoors | Dec 20 – Jan 3 |
| Transplant outdoors | Mar 14 – Mar 28 |
| Harvest | Jun 12 – Jun 26 |
Tip: Slow from seed and frost-tender in cold zones — most gardeners start from a plant and overwinter indoors.
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 →