When to plant Zinnia in Zone 1b
In Zone 1b, Zinnia: start seeds indoors around May 13–May 27; transplant outdoors around Jun 17–Jun 24; direct sow outdoors around Jun 10–Jun 24. Expect to harvest around Aug 9–Aug 23.
| Step | When |
|---|---|
| Start seeds indoors | May 13 – May 27 |
| Transplant outdoors | Jun 17 – Jun 24 |
| Direct sow outdoors | Jun 10 – Jun 24 |
| Harvest | Aug 9 – Aug 23 |
| Harvest | Aug 16 – Aug 23 |
Tip: A cut-flower workhorse. Direct-sow after frost and pinch young plants for more stems.
Zone 1b averages a last spring frost around Jun 10 and a first fall frost around Aug 20. These are zone averages — look up your ZIP for your exact area.
See the full Zone 1b calendar in the tool →