When to plant Sunflower in Zone 8b
In Zone 8b, Sunflower: direct sow outdoors around Mar 15–Apr 5. Expect to harvest around May 24–Jun 14.
| Step | When |
|---|---|
| Direct sow outdoors | Mar 15 – Apr 5 |
| Harvest | May 24 – Jun 14 |
Tip: Direct-sow once frost has passed; sow every two weeks for a long succession of blooms.
Zone 8b averages a last spring frost around Mar 15 and a first fall frost around Nov 25. These are zone averages — look up your ZIP for your exact area.
See the full Zone 8b calendar in the tool →