National Arbor Day, founded by Julius Sterling Morton, is a nationwide observance encouraging tree planting in the U.S.. The federally designated date occurs the last Friday in April, but many states observe Arbor Day on dates better suited to their best tree-planting times. In the state of Washington, Arbor Day is observed the second Wednesday in April.
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Earlier Event: April 9
Eid ul-Fitr
Later Event: April 12
Arbor Day in West Virginia