When to plant spinach 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 spinach in Zone 4

The harvest estimate counts 45 days to maturity, then a picking window of about 21 days. These windows use typical frost dates for Zone 4; Dibble pins them to your exact ZIP code.

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Spinach in a Zone 4 season

Zone 4 gives about 134 frost-free days. Spinach needs roughly 45 days from sowing. That leaves about 89 days of slack, so there is room for a late start or a second planting.

Sowing every 14 days, Zone 4 has room for about 7 plantings.

How to grow spinach

Sow spinach in the cool part of the year: it thrives in cool soil and bolts quickly in heat or long days. Sow again every 2 weeks while it stays cool, and stop when the weather warms.

Companion plants

Good neighbors for Spinach:

Spinach in other zones

Not in Zone 4? Pick your zone for the same dated windows.

Keep exploring

Spinach: 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.