DibbleWhen to plant blueberries in Zone 4
In Zone 4, the last spring frost usually passes around May 10 and the first fall frost arrives around September 21, leaving about 134 frost-free days. The windows below are computed from those frost dates, with the same math the Dibble app uses.
Cool climate with a brief warm window. Indoor starts and season extension help.
Planting windows for blueberries in Zone 4
| Task | Window |
|---|---|
| Transplant | Apr 19 to May 3 |
| Estimated harvest | Aug 17 to Sep 16 |
The harvest estimate counts 120 days to maturity, then a picking window of about 30 days. These windows use typical frost dates for Zone 4; Dibble pins them to your exact ZIP code.
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Blueberry in a Zone 4 season
Zone 4 gives about 134 frost-free days. Blueberry needs roughly 120 days from transplant. That leaves about 14 days of slack, which is tight. Start indoors where you can and do not sow late.
How to grow blueberries
Plant bare-root bushes in early spring in acidic soil. A long-lived perennial, full crops come in a few years, so be patient.
Companion plants
Good neighbors for Blueberry:
Blueberry in other zones
Not in Zone 4? Pick your zone for the same dated windows.
Keep exploring
Blueberry: the full growing guide · The Zone 4 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.