When to plant Sunflower in Zone 6b
In Zone 6b, Sunflower: direct sow outdoors around Apr 15–May 6. Expect to harvest around Jun 24–Jul 15.
| Step | When |
|---|---|
| Direct sow outdoors | Apr 15 – May 6 |
| Harvest | Jun 24 – Jul 15 |
Tip: Direct-sow once frost has passed; sow every two weeks for a long succession of blooms.
Zone 6b averages a last spring frost around Apr 15 and a first fall frost around Oct 25. These are zone averages — look up your ZIP for your exact area.
See the full Zone 6b calendar in the tool →