1. On September 15, 1893, the Montana Agricultural College (now Montana State University) held its first classes in Bozeman, Montana. Originally founded as a land-grant institution to teach agriculture and mechanical arts, it has since expanded to offer degrees in a wide range of fields.

2. On September 15, 1904, the first edition of the Helena Independent Record was published. The newspaper has been in continuous operation since then, providing news and information to the people of Helena and the surrounding areas.

3. The Great Montana Centennial Cattle Drive began on September 15, 1989, in Miles City, Montana. The cattle drive was a reenactment of the cattle drives that took place in Montana in the late 1800s, and brought together over 2,000 cattle and 1,000 riders for a 50-mile journey.

4. On September 15, 2008, the first patient was admitted to the new Providence St. Patrick Hospital in Missoula, Montana. The hospital, which replaced the old St. Patrick Hospital, is a state-of-the-art medical facility serving patients from across Montana and beyond.

5. In 2020, September 15 marked the beginning of National Hispanic Heritage Month in the United States. Montana has a growing Hispanic population, with many families working in agriculture and other industries throughout the state. The month-long celebration is an opportunity to recognize the contributions of Hispanic people to the history and culture of Montana and the United States as a whole.