When to plant Tomato in Zone 4b
In Zone 4b, Tomato: start seeds indoors around Mar 22–Apr 5; transplant outdoors around May 17–May 24. Expect to harvest around Jul 31–Aug 7.
| Step | When |
|---|---|
| Start seeds indoors | Mar 22 – Apr 5 |
| Transplant outdoors | May 17 – May 24 |
| Harvest | Jul 31 – Aug 7 |
Tip: Start indoors 6 weeks before last frost. Don't transplant until nights stay above 50°F (10°C).
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 →