When to plant Sunflower in Zone 6a
In Zone 6a, Sunflower: direct sow outdoors around Apr 21–May 12. Expect to harvest around Jun 30–Jul 21.
| Step | When |
|---|---|
| Direct sow outdoors | Apr 21 – May 12 |
| Harvest | Jun 30 – Jul 21 |
Tip: Direct-sow once frost has passed; sow every two weeks for a long succession of blooms.
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 →