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Plant Hardiness Zones
USDA Plant Hardiness Zones

Celsius Degrees
ZONE 2: -50 to -40 Degrees		ZONE 7: 0 to 10 Degrees
ZONE 3: -40 to -30 Degrees		ZONE 8: 10 to 20 Degrees
ZONE 4: -30 to -20 Degrees		ZONE 9: 20 to 30 Degrees
ZONE 5: -20 to -10 Degrees		ZONE 10 30 to 40 Degrees
ZONE 6 -10 to 0 Degrees		ZONE 11 Above 40

Based on Average Annual minimum winter temperature.

The USDA plant hardiness map was developed by the United States Department of Agriculture - ARS Division.  The 11 zones are based on the average annual minimum temperature for each zone.   Zone 2 on the above map is coldest and Zone 11 is the Hottest. This information is used in selecting plants for your micro climate areas. 

A lot of factors including altitude, wind exposure, proximity to water, snow cover, soil types and location in mountainous terrain (valley, North, South locations) have effects on the annual temp.  These factors can change the hardiness zone as much as 2 zones difference.  This applies both for plants that do best in cool weather and in hot weather, with the growing zone being extended based on all the factors.  

To see a more detailed description & picture of the USDA  Temperature / Plant hardiness zones for your state, Visit our state by state guide at Lawngrass.com

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