Growing tomatillo in zone 4a
(Zone 4a = an average winter low of -30°F to -25°F.)
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 tomatillo against those dates.
Start seeds indoorsMarch 24 to April 14
Transplant outdoorsMay 19 to May 26
Direct sow outdoorsApril 28
Expected harvestJuly 18 to August 9About 60 to 75 days from transplanting.
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 tomatillo from Utah State University Extension. Zone dates are medians; local conditions vary.