When to plant Zinnia in Zone 3a
In Zone 3a, Zinnia: start seeds indoors around Apr 27–May 11; transplant outdoors around Jun 1–Jun 8; direct sow outdoors around May 25–Jun 8. Expect to harvest around Jul 24–Aug 7.
| Step | When |
|---|---|
| Start seeds indoors | Apr 27 – May 11 |
| Transplant outdoors | Jun 1 – Jun 8 |
| Direct sow outdoors | May 25 – Jun 8 |
| Harvest | Jul 24 – Aug 7 |
| Harvest | Jul 31 – Aug 7 |
Tip: A cut-flower workhorse. Direct-sow after frost and pinch young plants for more stems.
Zone 3a averages a last spring frost around May 25 and a first fall frost around Sep 8. These are zone averages — look up your ZIP for your exact area.
See the full Zone 3a calendar in the tool →