DibbleWhen to plant dahlia in Zone 3
In Zone 3, the last spring frost usually passes around May 15 and the first fall frost arrives around September 15, leaving about 123 frost-free days. The windows below are computed from those frost dates, with the same math the Dibble app uses.
Short, cool season. Start most warm crops indoors and protect from late frosts.
Planting windows for dahlia in Zone 3
| Task | Window |
|---|---|
| Plant tubers | May 22 to Jun 5 |
| Estimated harvest | Aug 20 to Oct 29 |
The harvest estimate counts 90 days to maturity, then a picking window of about 70 days. These windows use typical frost dates for Zone 3; 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 3 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.