When to plant Dahlia in Zone 9a
In Zone 9a, Dahlia: start seeds indoors around Jan 31–Feb 14; transplant outdoors around Mar 7–Mar 14. Expect to harvest around Jun 15–Jun 22.
| Step | When |
|---|---|
| Start seeds indoors | Jan 31 – Feb 14 |
| Transplant outdoors | Mar 7 – Mar 14 |
| Harvest | Jun 15 – Jun 22 |
Tip: Plant tubers after frost. In cold zones, lift and store them indoors over winter.
Zone 9a averages a last spring frost around Feb 28 and a first fall frost around Dec 5. These are zone averages — look up your ZIP for your exact area.
See the full Zone 9a calendar in the tool →