When to plant Sunflower in Zone 9b
In Zone 9b, Sunflower: direct sow outdoors around Feb 15–Mar 8. Expect to harvest around Apr 26–May 17.
| Step | When |
|---|---|
| Direct sow outdoors | Feb 15 – Mar 8 |
| Harvest | Apr 26 – May 17 |
Tip: Direct-sow once frost has passed; sow every two weeks for a long succession of blooms.
Zone 9b averages a last spring frost around Feb 15 and a first fall frost around Dec 15. These are zone averages — look up your ZIP for your exact area.
See the full Zone 9b calendar in the tool →