Hardiness Zone Map at

An extensive view of U.S. Hardiness Zones based on National Climatic Data Center stations.

US Hardiness Zone Map - Center for Landscape & Urban Horticulture

USDA Hardiness Zones & Map

New-And-Improved USDA Plant Hardiness Zone Map

What's Going On in This Graph? Growing Zones - The New York Times

USDA Unveils New Plant Hardiness Zone Map – Extension Fond du Lac County

Cottage Farms Direct

Our Guide to the USDA Gardening Zones

Hardiness Zone Map at

Hardiness Zones in the USA