1. In 1884, President Chester A. Arthur signed a bill establishing Montana Territory. This made June 13 an important day in Montana's history as it marked the beginning of the state's development.

2. In 1910, a massive forest fire broke out in western Montana that resulted in the death of 85 people. Known as the "Big Blowup," the fire razed over three million acres of the state's forests.

3. On June 13, 1923, Glacier National Park was established by President Warren G. Harding. The park, located in northern Montana, is home to glaciers, lakes, and a diverse range of flora and fauna.

4. In 1988, Montana experienced one of its worst droughts on record, with only 58% of the state's normal rainfall. This led to widespread wildfires, which burned over a million acres of land.

5. On June 13, 2017, Montana Governor Steve Bullock declared a state of emergency due to widespread flooding caused by heavy rainfall and snowmelt. The flooding affected several popular tourist destinations and caused extensive damage to roads and infrastructure.