When to plant Rosemary in Zone 6a
In Zone 6a, Rosemary: start seeds indoors around Feb 10–Feb 24; transplant outdoors around May 5–May 19. Expect to harvest around Aug 3–Aug 17.
| Step | When |
|---|---|
| Start seeds indoors | Feb 10 – Feb 24 |
| Transplant outdoors | May 5 – May 19 |
| Harvest | Aug 3 – Aug 17 |
Tip: Slow from seed and frost-tender in cold zones — most gardeners start from a plant and overwinter indoors.
Zone 6a averages a last spring frost around Apr 21 and a first fall frost around Oct 17. These are zone averages — look up your ZIP for your exact area.
See the full Zone 6a calendar in the tool →