When to plant Dahlia in Zone 7a
In Zone 7a, Dahlia: start seeds indoors around Mar 10–Mar 24; transplant outdoors around Apr 14–Apr 21. Expect to harvest around Jul 23–Jul 30.
| Step | When |
|---|---|
| Start seeds indoors | Mar 10 – Mar 24 |
| Transplant outdoors | Apr 14 – Apr 21 |
| Harvest | Jul 23 – Jul 30 |
Tip: Plant tubers after frost. In cold zones, lift and store them indoors over winter.
Zone 7a averages a last spring frost around Apr 7 and a first fall frost around Nov 2. These are zone averages — look up your ZIP for your exact area.
See the full Zone 7a calendar in the tool →