Flagstaff, Arizona is in USDA Hardiness Zones 5b and 6a

Flagstaff, Arizona Hardiness Zone Map

Flagstaff Border
Zone 5b
-15°F to -10°F
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.

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