When to plant Sunflower in Zone 10b
In Zone 10b, Sunflower: direct sow outdoors around Jan 15–Feb 5. Expect to harvest around Mar 26–Apr 16.
| Step | When |
|---|---|
| Direct sow outdoors | Jan 15 – Feb 5 |
| Harvest | Mar 26 – Apr 16 |
Tip: Direct-sow once frost has passed; sow every two weeks for a long succession of blooms.
Zone 10b averages a last spring frost around Jan 15 and a first fall frost around Dec 31. These are zone averages — look up your ZIP for your exact area.
See the full Zone 10b calendar in the tool →