DibbleWhen to plant dahlia 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 dahlia in Zone 10
| Task | Window |
|---|---|
| Plant tubers | Feb 7 to Feb 21 |
| Estimated harvest | May 8 to Jul 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 10; 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 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.