Cold And Heat Tolerance

Some trees are very cold hardy and withstand extremely cold temperatures, while others are killed by a mild frost. In some cases a tree may be fairly cold hardy while dormant but may become active too early in the spring and suffer damage by a late frost. Other species may be able to tolerate very high temperatures and some withstand both extreme cold and heat quite well. Plant hardiness zones indicating average annual minimum temperatures have been developed by the U.S. Department of Agriculture and are shown for Utah on page 11. A detailed map of these zones for Utah is available from the Utah Climate Center at Utah State University or at

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