When to plant Watermelon in Zone 10b
In Zone 10b, Watermelon: start seeds indoors around Dec 18–Jan 1; transplant outdoors around Jan 29–Feb 5; direct sow outdoors around Jan 22–Feb 5. Expect to harvest around Apr 17–May 1.
| Step | When |
|---|---|
| Start seeds indoors | Dec 18 – Jan 1 |
| Transplant outdoors | Jan 29 – Feb 5 |
| Direct sow outdoors | Jan 22 – Feb 5 |
| Harvest | Apr 17 – May 1 |
| Harvest | Apr 24 – May 1 |
Tip: Needs heat and a long season. In short-summer zones, start indoors and use black plastic to warm the soil.
Zone 10b averages a last spring frost around Jan 15 and a first fall frost around Dec 31. These are zone averages — look up your ZIP for your exact area.
See the full Zone 10b calendar in the tool →