St. Martins, Missouri is in USDA Hardiness Zones 6a
St. Martins, Missouri Hardiness Zone Map
St. Martins Border
Zone 6a -10°F to -5°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.