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When to plant watermelon in Zone 10a
In Zone 10a, start indoors around January 1 – January 8 and transplant around January 22 – February 5.
Your watermelon timeline — Zone 10a
| Start indoors | January 1 – January 8 |
|---|---|
| Transplant | January 22 – February 5 |
| Zone 10a last frost | ~01/15 |
| Zone 10a first frost | ~12/02 |
Start indoors; set out 2 weeks after the last frost. [src]Cited: Johnny's Selected Seeds — Seed-Starting Date Calculator chart
Dates computed from Zone 10a's median NOAA frost normals and the cited rule. Your town may differ by a week or two — check your exact ZIP.
What you'll need
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Last verified 2026-07-17. Frost: NOAA NCEI 1991–2020. Zone: USDA 2023. Rule: Johnny's Selected Seeds — Seed-Starting Date Calculator chart; University of Georgia Extension — Vegetable Planting Chart (Circular C963) (days to maturity).