When to plant Dahlia in Zone 2a
In Zone 2a, Dahlia: start seeds indoors around May 8–May 22; transplant outdoors around Jun 12–Jun 19. Expect to harvest around Sep 20–Sep 27.
| Step | When |
|---|---|
| Start seeds indoors | May 8 – May 22 |
| Transplant outdoors | Jun 12 – Jun 19 |
| Harvest | Sep 20 – Sep 27 |
Tip: Plant tubers after frost. In cold zones, lift and store them indoors over winter.
Zone 2a averages a last spring frost around Jun 5 and a first fall frost around Aug 25. These are zone averages — look up your ZIP for your exact area.
See the full Zone 2a calendar in the tool →