Growing broccoli in zone 4b

In USDA zone 4b, the typical last spring frost is May 8 and the first fall frost is October 1. Here is when to plant broccoli against those dates.

Start seeds indoorsFebruary 27 to March 13

Transplant outdoorsApril 17 to April 24

Direct sow outdoorsApril 17 to April 24

These are zone 4b averages

Computed from 1,251 ZIP codes in zone 4b. 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 broccoli from Utah State University Extension. Zone dates are medians; local conditions vary.