When to plant Dahlia in Zone 2b
In Zone 2b, Dahlia: start seeds indoors around May 2–May 16; transplant outdoors around Jun 6–Jun 13. Expect to harvest around Sep 14–Sep 21.
| Step | When |
|---|---|
| Start seeds indoors | May 2 – May 16 |
| Transplant outdoors | Jun 6 – Jun 13 |
| Harvest | Sep 14 – Sep 21 |
Tip: Plant tubers after frost. In cold zones, lift and store them indoors over winter.
Zone 2b averages a last spring frost around May 30 and a first fall frost around Sep 1. These are zone averages — look up your ZIP for your exact area.
See the full Zone 2b calendar in the tool →