1. On September 30, 1858, a group of prospectors discovered gold in what is now known as Cherry Creek, leading to the creation of the city of Denver.

2. The Colorado State Capitol building was completed on September 30, 1894, after 14 years of construction.

3. In 1963, the University of Colorado Boulder established the first College of Environmental Design in the United States on September 30.

4. On September 30, 2013, the Colorado Department of Agriculture launched the “Choose Colorado” campaign, aiming to promote and support local agriculture and products.

5. On September 30, 2009, the Colorado Rockies clinched a Wild Card spot in the National League playoffs with a victory over the Milwaukee Brewers. It was their second straight playoff appearance.