When to plant Dahlia in Zone 6b
In Zone 6b, Dahlia: start seeds indoors around Mar 18–Apr 1; transplant outdoors around Apr 22–Apr 29. Expect to harvest around Jul 31–Aug 7.
| Step | When |
|---|---|
| Start seeds indoors | Mar 18 – Apr 1 |
| Transplant outdoors | Apr 22 – Apr 29 |
| Harvest | Jul 31 – Aug 7 |
Tip: Plant tubers after frost. In cold zones, lift and store them indoors over winter.
Zone 6b averages a last spring frost around Apr 15 and a first fall frost around Oct 25. These are zone averages — look up your ZIP for your exact area.
See the full Zone 6b calendar in the tool →