Growing black-eyed susan 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 black-eyed susan against those 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 black-eyed susan from University of Wisconsin-Madison Division of Extension (Wisconsin Horticulture). Zone dates are medians; local conditions vary.