Summit County, Colorado is in USDA Hardiness Zones 4a, 4b, 5a and 5b

Summit County, Colorado Hardiness Zone Map

Summit County Border
Zone 4a
-30°F to -25°F
Zone 4b
-25°F to -20°F
Zone 5a
-20°F to -15°F
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.

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