DibbleWhen to plant watermelon in Zone 9
In Zone 9, the last spring frost usually passes around March 1 and the first fall frost arrives around December 1, leaving about 275 frost-free days. The windows below are computed from those frost dates, with the same math the Dibble app uses.
Very long season. Plant cool crops in fall and winter; manage summer heat.
Planting windows for watermelon in Zone 9
| Task | Window |
|---|---|
| Direct sow | Mar 15 to Mar 29 |
| Estimated harvest | Jun 8 to Jun 29 |
The harvest estimate counts 85 days to maturity, then a picking window of about 21 days. These windows use typical frost dates for Zone 9; Dibble pins them to your exact ZIP code.
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How to grow watermelon
Watermelon needs heat and room. Sow 2 weeks after last frost; in short seasons start indoors and pick early varieties.
Companion plants
Good neighbors for Watermelon:
Better kept apart:
Watermelon in nearby zones
Keep exploring
Watermelon: the full growing guide · The Zone 9 planting calendar · Every crop and zone
Plant at the right time this season
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Dates are estimates based on typical frost dates for the zone. Your yard has its own microclimate, so use them as a starting point and adjust as you learn your space.