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Sprout Authority

Growing spinach in zone 4a

In USDA zone 4a, the typical last spring frost is May 12 and the first fall frost is September 28. Here is when to plant spinach against those dates.

Start seeds indoorsMarch 31 to April 7
Transplant outdoorsMay 12
Direct sow outdoorsApril 14 to April 21
Plant in fallJuly 20 to August 24

These are zone 4a averages

Computed from 795 ZIP codes in zone 4a. Your town's frost dates vary; enter your ZIP for dates built on your nearest weather station.

Get my exact dates

USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service / Oregon State University PRISM Group. NOAA National Centers for Environmental Information, U.S. Climate Normals 1991-2020. Planting windows for spinach from Utah State University Extension. Zone dates are medians; local conditions vary.