When to plant Rosemary in Zone 10b
In Zone 10b, Rosemary: start seeds indoors around Nov 6–Nov 20; transplant outdoors around Jan 29–Feb 12. Expect to harvest around Apr 29–May 13.
| Step | When |
|---|---|
| Start seeds indoors | Nov 6 – Nov 20 |
| Transplant outdoors | Jan 29 – Feb 12 |
| Harvest | Apr 29 – May 13 |
Tip: Slow from seed and frost-tender in cold zones — most gardeners start from a plant and overwinter indoors.
Zone 10b averages a last spring frost around Jan 15 and a first fall frost around Dec 31. These are zone averages — look up your ZIP for your exact area.
See the full Zone 10b calendar in the tool →