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Sprout Authority

Growing sweet corn in zone 3b

In USDA zone 3b, the typical last spring frost is May 17 and the first fall frost is September 23. Here is when to plant sweet corn against those dates.

Direct sow outdoorsMay 17 to May 31
Expected harvestJuly 16 to August 29About 60 to 90 days from sowing.

These are zone 3b averages

Computed from 224 ZIP codes in zone 3b. 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 sweet corn from University of Minnesota Extension. Zone dates are medians; local conditions vary.