When to plant Zinnia in Zone 10b
In Zone 10b, Zinnia: start seeds indoors around Dec 18–Jan 1; transplant outdoors around Jan 22–Jan 29; direct sow outdoors around Jan 15–Jan 29. Expect to harvest around Mar 16–Mar 30.
| Step | When |
|---|---|
| Start seeds indoors | Dec 18 – Jan 1 |
| Transplant outdoors | Jan 22 – Jan 29 |
| Direct sow outdoors | Jan 15 – Jan 29 |
| Harvest | Mar 16 – Mar 30 |
| Harvest | Mar 23 – Mar 30 |
Tip: A cut-flower workhorse. Direct-sow after frost and pinch young plants for more stems.
Zone 10b averages a last spring frost around Jan 15 and a first fall frost around Dec 31. These are zone averages — look up your ZIP for your exact area.
See the full Zone 10b calendar in the tool →