When to plant Mint in Zone 4b
In Zone 4b, Mint: transplant outdoors around May 10–May 24. Expect to harvest around Jul 24–Aug 7.
| Step | When |
|---|---|
| Transplant outdoors | May 10 – May 24 |
| Harvest | Jul 24 – Aug 7 |
Tip: Vigorous to the point of invasive — grow it in a pot or buried container to contain the roots.
Zone 4b averages a last spring frost around May 10 and a first fall frost around Sep 22. These are zone averages — look up your ZIP for your exact area.
See the full Zone 4b calendar in the tool →