When to plant Cosmos in Zone 7b
In Zone 7b, Cosmos: direct sow outdoors around Apr 1–Apr 15. Expect to harvest around May 31–Jun 14.
| Step | When |
|---|---|
| Direct sow outdoors | Apr 1 – Apr 15 |
| Harvest | May 31 – Jun 14 |
Tip: Thrives on neglect — too-rich soil gives leaves at the expense of flowers.
Zone 7b averages a last spring frost around Apr 1 and a first fall frost around Nov 10. These are zone averages — look up your ZIP for your exact area.
See the full Zone 7b calendar in the tool →