Arbor Day.

Wyo. Stat. Ann. § 8-4-102
in effect
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(a) The state forester shall promote the following activities to commemorate Arbor Day, the last Monday in April: (i) A tree shall be planted on state grounds in a simple ceremony; (ii) The planting of a seedling tree or some other act may be performed in an appropriate ceremony in the schools of Wyoming.
Source: WY Statutes (Official Site)URL: https://wyoleg.gov/statutes/compress/title08.pdfFetched: 10/4/2026