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Sprout Authority

Growing radish 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 radish against those dates.

Direct sow outdoorsApril 21 to April 28
Expected harvestMay 16 to June 12About 25 to 45 days from sowing.

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 radish from Utah State University Extension. Zone dates are medians; local conditions vary.