The Wyoming State Library will be closed Monday, September 4, for the Labor Day holiday. We will reopen on Tuesday, September 5.
— From the U.S. Department of Labor’s history of Labor Day
Labor Day became a state holiday in Wyoming following the 1923 legislative session. Representative Bert Waddell of Crook County introduced House Bill #64 on January 20, 1923. After passing both chambers, the bill was signed into law by Governor William Ross on February 8. Initially Labor Day was to be observed “on a day that may be appointed by the Governor.” In 1929, House Bill #21 changed this to read the “first Monday in September.”
You can find this and other fascinating facts of legislative history in Wyoming Legislation.