When to plant Sunflower in Zone 2b
In Zone 2b, Sunflower: direct sow outdoors around May 30–Jun 20. Expect to harvest around Aug 8–Aug 29.
| Step | When |
|---|---|
| Direct sow outdoors | May 30 – Jun 20 |
| Harvest | Aug 8 – Aug 29 |
Tip: Direct-sow once frost has passed; sow every two weeks for a long succession of blooms.
Zone 2b averages a last spring frost around May 30 and a first fall frost around Sep 1. These are zone averages — look up your ZIP for your exact area.
See the full Zone 2b calendar in the tool →