When to plant Tomato in Zone 3a
In Zone 3a, Tomato: start seeds indoors around Apr 6–Apr 20; transplant outdoors around Jun 1–Jun 8. Expect to harvest around Aug 15–Aug 22.
| Step | When |
|---|---|
| Start seeds indoors | Apr 6 – Apr 20 |
| Transplant outdoors | Jun 1 – Jun 8 |
| Harvest | Aug 15 – Aug 22 |
Tip: Start indoors 6 weeks before last frost. Don't transplant until nights stay above 50°F (10°C).
Zone 3a averages a last spring frost around May 25 and a first fall frost around Sep 8. These are zone averages — look up your ZIP for your exact area.
See the full Zone 3a calendar in the tool →