When to plant Sunflower in Zone 9a
In Zone 9a, Sunflower: direct sow outdoors around Feb 28–Mar 21. Expect to harvest around May 9–May 30.
| Step | When |
|---|---|
| Direct sow outdoors | Feb 28 – Mar 21 |
| Harvest | May 9 – May 30 |
Tip: Direct-sow once frost has passed; sow every two weeks for a long succession of blooms.
Zone 9a averages a last spring frost around Feb 28 and a first fall frost around Dec 5. These are zone averages — look up your ZIP for your exact area.
See the full Zone 9a calendar in the tool →