Growing romanesco in zone 6a

(Zone 6a = an average winter low of -10°F to -5°F.)

In USDA zone 6a, the typical last spring frost is April 29 and the first fall frost is October 16. Here is when to plant romanesco against those dates.

Start seeds indoorsMarch 18 to April 1

Transplant outdoorsApril 29

Expected harvestJuly 13 to August 7About 75 to 100 days from transplanting.

These are zone 6a averages

Computed from 5,156 ZIP codes in zone 6a. 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 romanesco from University of Wisconsin-Madison Division of Extension. Zone dates are medians; local conditions vary.