Changes in Hardiness Zones

This animation illustrates how the hardiness zones for plants have changed between 1990 and 2006 based on an extensive updating of U.S. Hardiness Zones using data from 5,000 National Climatic Data Center cooperative stations across the continental United States.

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Arbor Day Foundation

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When the user presses "play" there is a visible shift in the hardiness zone from 1990 to 2006. When the user presses "difference", the shifts across zones are highlighted.

There is some commentary about these maps in the press release -

A high-resolution version of this map is available for download.

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