When to plant Sunflower in Zone 5a
In Zone 5a, Sunflower: direct sow outdoors around May 5–May 26. Expect to harvest around Jul 14–Aug 4.
| Step | When |
|---|---|
| Direct sow outdoors | May 5 – May 26 |
| Harvest | Jul 14 – Aug 4 |
Tip: Direct-sow once frost has passed; sow every two weeks for a long succession of blooms.
Zone 5a averages a last spring frost around May 5 and a first fall frost around Oct 1. These are zone averages — look up your ZIP for your exact area.
See the full Zone 5a calendar in the tool →