When to plant Dahlia in Zone 10a
In Zone 10a, Dahlia: start seeds indoors around Jan 3–Jan 17; transplant outdoors around Feb 7–Feb 14. Expect to harvest around May 18–May 25.
| Step | When |
|---|---|
| Start seeds indoors | Jan 3 – Jan 17 |
| Transplant outdoors | Feb 7 – Feb 14 |
| Harvest | May 18 – May 25 |
Tip: Plant tubers after frost. In cold zones, lift and store them indoors over winter.
Zone 10a averages a last spring frost around Jan 31 and a first fall frost around Dec 28. These are zone averages — look up your ZIP for your exact area.
See the full Zone 10a calendar in the tool →