When to plant Rosemary in Zone 1b
In Zone 1b, Rosemary: start seeds indoors around Apr 1–Apr 15; transplant outdoors around Jun 24–Jul 8. Expect to harvest around Sep 22–Oct 6.
| Step | When |
|---|---|
| Start seeds indoors | Apr 1 – Apr 15 |
| Transplant outdoors | Jun 24 – Jul 8 |
| Harvest | Sep 22 – Oct 6 |
Tip: Slow from seed and frost-tender in cold zones — most gardeners start from a plant and overwinter indoors.
Zone 1b averages a last spring frost around Jun 10 and a first fall frost around Aug 20. These are zone averages — look up your ZIP for your exact area.
See the full Zone 1b calendar in the tool →