When to plant Rosemary in Zone 9b
In Zone 9b, Rosemary: start seeds indoors around Dec 7–Dec 21; transplant outdoors around Mar 1–Mar 15. Expect to harvest around May 30–Jun 13.
| Step | When |
|---|---|
| Start seeds indoors | Dec 7 – Dec 21 |
| Transplant outdoors | Mar 1 – Mar 15 |
| Harvest | May 30 – Jun 13 |
Tip: Slow from seed and frost-tender in cold zones — most gardeners start from a plant and overwinter indoors.
Zone 9b averages a last spring frost around Feb 15 and a first fall frost around Dec 15. These are zone averages — look up your ZIP for your exact area.
See the full Zone 9b calendar in the tool →