DibbleWhen to plant dahlia 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 dahlia in Zone 9
| Task | Window |
|---|---|
| Plant tubers | Mar 8 to Mar 22 |
| Estimated harvest | Jun 6 to Aug 15 |
The harvest estimate counts 90 days to maturity, then a picking window of about 70 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 dahlia
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 nearby zones
Keep exploring
Dahlia: the full growing guide · The Zone 9 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.