DibbleWhen to plant garlic 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 garlic in Zone 4
| Task | Window |
|---|---|
| Direct sow | Aug 24 to Sep 7 |
| Estimated harvest | Apr 21 to May 5 |
The harvest estimate counts 240 days to maturity, then a picking window of about 14 days. These windows use typical frost dates for Zone 4; Dibble pins them to your exact ZIP code.
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Garlic in a Zone 4 season
Zone 4 gives about 134 frost-free days. Garlic needs roughly 240 days from sowing. That is longer than the outdoor season here, so this one needs an indoor start, and even then it may want a tunnel or row cover to finish.
How to grow garlic
Plant individual cloves 4-6 weeks before your first fall frost, pointy end up. Mulch for winter and harvest the following summer when lower leaves brown.
Companion plants
Good neighbors for Garlic:
Better kept apart:
Garlic in other zones
Not in Zone 4? Pick your zone for the same dated windows.
Keep exploring
Garlic: 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.