DibbleWhen to plant leek 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 leek in Zone 3
| Task | Window |
|---|---|
| Start seeds indoors | Mar 6 to Mar 20 |
| Transplant | May 1 to May 15 |
| Estimated harvest | Aug 29 to Oct 13 |
The harvest estimate counts 120 days to maturity, then a picking window of about 45 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 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 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.