Differences between 1990 USDA hardiness zones and 2006 arborday.org hardiness zones reflect warmer climate

Much of the U. S. has been warmer in recent years, and that affects which trees are right for planting. The Arbor Day Foundation has recently completed an extensive updating of U.S. Hardiness Zones based upon data from 5,000 National Climatic Data Center cooperative stations across the continental United States.

  1. Watch an animation showing the zone changes from 1990 through 2006.
  2. Download a high resolution TIF of this map.
  3. Find your hardiness zone.

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