1. On November 15, 1872, the first train arrived in Greeley, Colorado. The Colorado Central Railroad had built a track to the town to support the growing agriculture industry.

2. In 1909, on November 15, Colorado Governor John F. Shafroth signed a bill creating Rocky Mountain National Park. The park spans over 415 square miles and attracts millions of visitors each year to its stunning natural beauty.

3. On November 15, 1927, the Colorado River Compact was signed in Santa Fe, New Mexico. The agreement allocated the waters of the Colorado River between seven western states, including Colorado, and established guidelines for water usage.

4. The first issue of the Vail Trail newspaper was published on November 15, 1965. The newspaper covered events and developments in the Vail Valley, a popular skiing destination in Colorado.

5. On November 15, 1971, the Colorado Rockies played their first home game as a professional hockey team. They defeated the Toronto Maple Leafs 5-1 at the McNichols Sports Arena in Denver.