When to plant Dahlia in Zone 9b
In Zone 9b, Dahlia: start seeds indoors around Jan 18–Feb 1; transplant outdoors around Feb 22–Mar 1. Expect to harvest around Jun 2–Jun 9.
| Step | When |
|---|---|
| Start seeds indoors | Jan 18 – Feb 1 |
| Transplant outdoors | Feb 22 – Mar 1 |
| Harvest | Jun 2 – Jun 9 |
Tip: Plant tubers after frost. In cold zones, lift and store them indoors over winter.
Zone 9b averages a last spring frost around Feb 15 and a first fall frost around Dec 15. These are zone averages — look up your ZIP for your exact area.
See the full Zone 9b calendar in the tool →