When to plant Thyme in Zone 3b
In Zone 3b, Thyme: start seeds indoors around Mar 25–Apr 8; transplant outdoors around May 20–Jun 3. Expect to harvest around Aug 8–Aug 22.
| Step | When |
|---|---|
| Start seeds indoors | Mar 25 – Apr 8 |
| Transplant outdoors | May 20 – Jun 3 |
| Harvest | Aug 8 – Aug 22 |
Tip: Perennial in most zones. Loves lean, well-drained soil — don't overwater or overfeed.
Zone 3b averages a last spring frost around May 20 and a first fall frost around Sep 12. These are zone averages — look up your ZIP for your exact area.
See the full Zone 3b calendar in the tool →