DeKalb County, Missouri is in USDA Hardiness Zones 5b
DeKalb County, Missouri Hardiness Zone Map
DeKalb County Border
Zone 5b -15°F to -10°F
A hardiness zone is a geographically defined area in which a specific category of plant life is capable of growing, as defined by climatic conditions, including its ability to withstand the minimum temperatures of the zone.