Growing dahlia in zone 6b

In USDA zone 6b, the typical last spring frost is April 23 and the first fall frost is October 22. Here is when to plant dahlia 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 dahlia from Penn State Extension. Zone dates are medians; local conditions vary.