Growing watermelon 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 watermelon against those dates.
Transplant outdoorsMay 17 to May 31
Direct sow outdoorsMay 17 to May 31
Expected harvestAugust 10 to August 29About 85 to 90 days from transplanting.
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 watermelon from Clemson Cooperative Extension, Home & Garden Information Center. Zone dates are medians; local conditions vary.