When to plant Watermelon in Zone 10a
In Zone 10a, Watermelon: start seeds indoors around Jan 3–Jan 17; transplant outdoors around Feb 14–Feb 21; direct sow outdoors around Feb 7–Feb 21. Expect to harvest around May 3–May 17.
| Step | When |
|---|---|
| Start seeds indoors | Jan 3 – Jan 17 |
| Transplant outdoors | Feb 14 – Feb 21 |
| Direct sow outdoors | Feb 7 – Feb 21 |
| Harvest | May 3 – May 17 |
| Harvest | May 10 – May 17 |
Tip: Needs heat and a long season. In short-summer zones, start indoors and use black plastic to warm the soil.
Zone 10a averages a last spring frost around Jan 31 and a first fall frost around Dec 28. These are zone averages — look up your ZIP for your exact area.
See the full Zone 10a calendar in the tool →