When to plant Watermelon in Zone 3a
In Zone 3a, Watermelon: start seeds indoors around Apr 27–May 11; transplant outdoors around Jun 8–Jun 15; direct sow outdoors around Jun 1–Jun 15. Expect to harvest around Aug 25–Sep 8.
| Step | When |
|---|---|
| Start seeds indoors | Apr 27 – May 11 |
| Transplant outdoors | Jun 8 – Jun 15 |
| Direct sow outdoors | Jun 1 – Jun 15 |
| Harvest | Aug 25 – Sep 8 |
| Harvest | Sep 1 – Sep 8 |
Tip: Needs heat and a long season. In short-summer zones, start indoors and use black plastic to warm the soil.
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 →