Interactive USDA Zone Map

Easily the most detailed Interactive USDA Zone Map on the web.  The plant maps utilizes the google maps api which allows users to accurately determine their usda hardiness zone.  Using advanced spatial analysis tools Plantmaps.com has also created its own customized hardiness zone map which incorporates low temperature from the period of 1960 to 2005.  the usda zones only cover the periods of 1960 to 1990.

Plantmaps.com also has many native range plant maps for north american plants including palm trees.