When to plant Zinnia in Zone 5b
In Zone 5b, Zinnia: start seeds indoors around Apr 2–Apr 16; transplant outdoors around May 7–May 14; direct sow outdoors around Apr 30–May 14. Expect to harvest around Jun 29–Jul 13.
| Step | When |
|---|---|
| Start seeds indoors | Apr 2 – Apr 16 |
| Transplant outdoors | May 7 – May 14 |
| Direct sow outdoors | Apr 30 – May 14 |
| Harvest | Jun 29 – Jul 13 |
| Harvest | Jul 6 – Jul 13 |
Tip: A cut-flower workhorse. Direct-sow after frost and pinch young plants for more stems.
Zone 5b averages a last spring frost around Apr 30 and a first fall frost around Oct 5. These are zone averages — look up your ZIP for your exact area.
See the full Zone 5b calendar in the tool →