DibbleWhen to plant dahlias 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 dahlias in Zone 11
| Task | Window |
|---|---|
| Plant tubers | Jan 8 to Jan 22 |
| Estimated harvest | Apr 8 to Jun 17 |
The harvest estimate counts 90 days to maturity, then a picking window of about 70 days. These windows use typical frost dates for Zone 11; Dibble pins them to your exact ZIP code.
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Dahlia in a Zone 11 season
Zone 11 gives about 365 frost-free days. Dahlia needs roughly 90 days from planting. That leaves about 275 days of slack, so there is room for a late start or a second planting.
How to grow dahlias
Plant tubers a week after last frost once soil warms. Lift and store them before the first hard freeze in cold zones.
Companion plants
Good neighbors for Dahlia:
Dahlia in other zones
Not in Zone 11? Pick your zone for the same dated windows.
Keep exploring
Dahlia: 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.