When to plant Dahlia in Zone 1b
In Zone 1b, Dahlia: start seeds indoors around May 13–May 27; transplant outdoors around Jun 17–Jun 24. Expect to harvest around Sep 25–Oct 2.
| Step | When |
|---|---|
| Start seeds indoors | May 13 – May 27 |
| Transplant outdoors | Jun 17 – Jun 24 |
| Harvest | Sep 25 – Oct 2 |
Tip: Plant tubers after frost. In cold zones, lift and store them indoors over winter.
Zone 1b averages a last spring frost around Jun 10 and a first fall frost around Aug 20. These are zone averages — look up your ZIP for your exact area.
See the full Zone 1b calendar in the tool →