DibbleWhen to plant eggplant 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 eggplant in Zone 4
| Task | Window |
|---|---|
| Start seeds indoors | Mar 29 to Apr 12 |
| Transplant | Jun 7 to Jun 21 |
| Estimated harvest | Aug 21 to Oct 20 |
The harvest estimate counts 75 days to maturity, then a picking window of about 60 days. These windows use typical frost dates for Zone 4; Dibble pins them to your exact ZIP code.
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Eggplant in a Zone 4 season
Zone 4 gives about 134 frost-free days. Eggplant needs roughly 75 days from transplant. That leaves about 59 days of slack, enough for one full crop with a little room for a cold spring.
How to grow eggplant
Eggplant craves heat. Start seeds indoors about 10 weeks before planting out, and transplant only once the soil is warm and nights stay mild. A chill stunts the plants for weeks.
Companion plants
Good neighbors for Eggplant:
Better kept apart:
Eggplant in other zones
Not in Zone 4? Pick your zone for the same dated windows.
Keep exploring
Eggplant: 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.