When to plant Zinnia in Zone 1a
In Zone 1a, Zinnia: start seeds indoors around May 18–Jun 1; transplant outdoors around Jun 22–Jun 29; direct sow outdoors around Jun 15–Jun 29. Expect to harvest around Aug 14–Aug 28.
| Step | When |
|---|---|
| Start seeds indoors | May 18 – Jun 1 |
| Transplant outdoors | Jun 22 – Jun 29 |
| Direct sow outdoors | Jun 15 – Jun 29 |
| Harvest | Aug 14 – Aug 28 |
| Harvest | Aug 21 – Aug 28 |
Tip: A cut-flower workhorse. Direct-sow after frost and pinch young plants for more stems.
Zone 1a averages a last spring frost around Jun 15 and a first fall frost around Aug 15. These are zone averages — look up your ZIP for your exact area.
See the full Zone 1a calendar in the tool →