When to plant Rosemary in Zone 1a
In Zone 1a, Rosemary: start seeds indoors around Apr 6–Apr 20; transplant outdoors around Jun 29–Jul 13. Expect to harvest around Sep 27–Oct 11.
| Step | When |
|---|---|
| Start seeds indoors | Apr 6 – Apr 20 |
| Transplant outdoors | Jun 29 – Jul 13 |
| Harvest | Sep 27 – Oct 11 |
Tip: Slow from seed and frost-tender in cold zones — most gardeners start from a plant and overwinter indoors.
Zone 1a averages a last spring frost around Jun 15 and a first fall frost around Aug 15. These are zone averages — look up your ZIP for your exact area.
See the full Zone 1a calendar in the tool →