Growing zucchini in zone 3b
In USDA zone 3b, the typical last spring frost is May 17 and the first fall frost is September 23. Here is when to plant zucchini against those dates.
Direct sow outdoorsMay 17 to May 31
Expected harvestJuly 11 to July 25About 55 to 55 days from sowing.
These are zone 3b averages
Computed from 224 ZIP codes in zone 3b. 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 zucchini from Clemson Cooperative Extension, Home & Garden Information Center. Zone dates are medians; local conditions vary.