Growing collards 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 collards against those dates.
Start seeds indoorsMarch 17
Transplant outdoorsApril 28
Direct sow outdoorsApril 21
Expected harvestJune 20 to July 10About 60 to 80 days from sowing.
Plant in fallJune 29
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 datesUSDA 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 collards from Clemson Cooperative Extension, Home & Garden Information Center. Zone dates are medians; local conditions vary.