1. On October 23, 1887, the University of Colorado Boulder was officially dedicated, marking the opening of the state's flagship university.

2. The Colorado State Capitol building was completed and opened on October 23, 1894. The distinctive gold dome was not added until several years later.

3. In 1910, the dedication ceremony for the Daniels and Fisher Tower in Denver was held on October 23. At the time, it was the tallest building west of the Mississippi River.

4. The first football game between the University of Colorado and Colorado State University was played on October 23, 1893. The Buffaloes won 70-6.

5. On October 23, 1929, the Colorado National Bank building in Denver was dedicated. It was the tallest building in Colorado at the time, standing at 135 feet tall.