When to plant Dahlia in Zone 10b
In Zone 10b, Dahlia: start seeds indoors around Dec 18–Jan 1; transplant outdoors around Jan 22–Jan 29. Expect to harvest around May 2–May 9.
| Step | When |
|---|---|
| Start seeds indoors | Dec 18 – Jan 1 |
| Transplant outdoors | Jan 22 – Jan 29 |
| Harvest | May 2 – May 9 |
Tip: Plant tubers after frost. In cold zones, lift and store them indoors over winter.
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 →