When to plant Dahlia in Zone 6a
In Zone 6a, Dahlia: start seeds indoors around Mar 24–Apr 7; transplant outdoors around Apr 28–May 5. Expect to harvest around Aug 6–Aug 13.
| Step | When |
|---|---|
| Start seeds indoors | Mar 24 – Apr 7 |
| Transplant outdoors | Apr 28 – May 5 |
| Harvest | Aug 6 – Aug 13 |
Tip: Plant tubers after frost. In cold zones, lift and store them indoors over winter.
Zone 6a averages a last spring frost around Apr 21 and a first fall frost around Oct 17. These are zone averages — look up your ZIP for your exact area.
See the full Zone 6a calendar in the tool →