DibbleWhen to plant corn in Zone 10
In Zone 10, the last spring frost usually passes around January 31 and the first fall frost arrives around December 15, leaving about 318 frost-free days. The windows below are computed from those frost dates, with the same math the Dibble app uses.
Nearly frost-free. Grow cool crops in winter; summers are too hot for many vegetables.
Planting windows for corn in Zone 10
| Task | Window |
|---|---|
| Direct sow | Feb 7 to Feb 21 |
| Estimated harvest | Apr 23 to May 3 |
The harvest estimate counts 75 days to maturity, then a picking window of about 10 days. These windows use typical frost dates for Zone 10; Dibble pins them to your exact ZIP code.
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Sweet Corn in a Zone 10 season
Zone 10 gives about 318 frost-free days. Sweet Corn needs roughly 75 days from sowing. That leaves about 243 days of slack, so there is room for a late start or a second planting.
How to grow corn
Sow corn a week after last frost in warm soil. Plant in blocks of several short rows, not one long row, for good pollination.
Companion plants
Good neighbors for Sweet Corn:
Better kept apart:
Sweet Corn in other zones
Not in Zone 10? Pick your zone for the same dated windows.
Keep exploring
Sweet Corn: the full growing guide · The Zone 10 planting calendar · Every crop and zone
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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.