Duluth, Minnesota is in USDA Hardiness Zones 4a and 4b

Duluth, Minnesota Hardiness Zone Map

Duluth Border
Zone 4a
-30°F to -25°F
Zone 4b
-25°F to -20°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.

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