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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Teaching Tips

Teaching Tips

This would be a good tool to introduce the idea that the climate is warming and provide a national frame to local and regional changes.

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