1. In 1879, Silverton, Colorado experienced a devastating avalanche on January 31st. The avalanche wiped out much of the town's business district and killed several people.

2. In 1893, the Colorado Women's Suffrage Association held its annual meeting on January 31st. This meeting was particularly significant as it marked the beginning of a campaign to secure women's right to vote in Colorado.

3. On January 31, 1912, the Denver & Rio Grande Railroad completed a new track that connected the eastern plains of Colorado to the western slope. This new route made transportation and commerce more accessible between the two regions.

4. In 1944, the United States Army Air Forces established the 10th Mountain Division at Camp Hale, located near Leadville, Colorado. This division specialized in mountain warfare and played a significant role in World War II.

5. January 31, 1958, marked the official opening of the Aspen Institute, a non-profit organization dedicated to promoting critical thinking, leadership development, and social action. The institute has since become an important hub for thinkers and leaders from various fields to engage in meaningful dialogue and collaboration.