1. In 1878, the Nez Perce tribe made camp along the Big Hole River in Western Montana in what is known as the Battle of the Big Hole. The United States Army attacked the Native Americans, resulting in the deaths of over 80 Nez Perce, including women and children.

2. One of Montana's most notorious outlaws, Henry Plummer, was hanged in Virginia City on January 17, 1864. Plummer was accused of leading a gang known as the "Innocents" and committing numerous robberies and murders.

3. Montana's first senator, William A. Clark, was born on January 17, 1839. Clark was a wealthy businessman and politician who played a significant role in developing Montana's mining industry.

4. On January 17, 1949, the University of Montana became the first college in the state to receive accreditation from the Northwest Association of Colleges and Schools.

5. Montana's first ski area, Bridger Bowl, opened on January 17, 1955. Located in the Bridger Mountains near Bozeman, the ski area has since expanded and is now a popular winter destination for locals and tourists alike.