DibbleWhen to plant leek 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 leek in Zone 4
| Task | Window |
|---|---|
| Start seeds indoors | Mar 1 to Mar 15 |
| Transplant | Apr 26 to May 10 |
| Estimated harvest | Aug 24 to Oct 8 |
The harvest estimate counts 120 days to maturity, then a picking window of about 45 days. These windows use typical frost dates for Zone 4; Dibble pins them to your exact ZIP code.
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How to grow leek
Start indoors 10 weeks before last frost. Transplant into a deep hole and hill soil up the stem to blanch the white shanks.
Companion plants
Good neighbors for Leek:
Better kept apart:
Leek in nearby zones
Keep exploring
Leek: 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.