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Learn about the history of Arbor Day - a day to celebrate trees. Also, learn when Arbor Day is celebrated in all 50 U.S. states. The history of the observance with information about international "tree" celebrations. Find out when each U.S. state celebrates Arbor Day.

This official site of the National Arbor Day Foundation provides information about planting and caring for trees, our Rain Forest Rescue and Tree City USA programs, and much more. Buy trees and give a gift of trees through our Trees in Memory and Trees for America programs. Provides resources for the nationally-celebrated observance that encourages tree planting and tree care.