1. The first known May Day celebration in Montana was held in Butte in 1899. The event was organized by the Western Federation of Miners as a demonstration for workers' rights and fair wages.

2. May 1, 1917 marked the beginning of a major labor strike in Butte known as the Metal Mine Workers' Strike. The strike lasted for over a year and involved thousands of workers, including women and children.

3. In 1930, Montana Governor John Erickson declared May 1 as "Law Day" in an effort to promote and celebrate the rule of law in the state. The tradition of observing Law Day on May 1 continues to this day.

4. May 1, 1935 saw the formation of the Montana Fish and Game Commission, which is responsible for managing the state's fish and wildlife resources. Today, the commission is known as the Montana Fish, Wildlife & Parks Department.

5. On May 1, 2008, a record-breaking snowstorm hit parts of Montana. In some areas, over two feet of snow fell within 24 hours, causing widespread power outages and travel disruptions.