DibbleWhen to plant sunflowers in Zone 11
In Zone 11, the last spring frost usually passes around January 1 and the first fall frost arrives around December 31, leaving about 365 frost-free days. The windows below are computed from those frost dates, with the same math the Dibble app uses.
Frost-free, tropical. Year-round growing; timing follows wet/dry and heat, not frost.
Planting windows for sunflowers in Zone 11
| Task | Window |
|---|---|
| Direct sow | Jan 1 to Jan 15 |
| Estimated harvest | Mar 22 to Apr 12 |
The harvest estimate counts 80 days to maturity, then a picking window of about 21 days. These windows use typical frost dates for Zone 11; Dibble pins them to your exact ZIP code.
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Sunflower in a Zone 11 season
Zone 11 gives about 365 frost-free days. Sunflower needs roughly 80 days from sowing. That leaves about 285 days of slack, so there is room for a late start or a second planting.
Sowing every 14 days, Zone 11 has room for about 21 plantings.
How to grow sunflowers
Sow sunflowers around your last frost date. Stagger plantings every couple of weeks for blooms all summer.
Companion plants
Good neighbors for Sunflower:
Better kept apart:
Sunflower in other zones
Not in Zone 11? Pick your zone for the same dated windows.
Keep exploring
Sunflower: the full growing guide · The Zone 11 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.