1. On September 13, 1860, the town of Canon City was founded in Colorado. It was named after the nearby Royal Gorge, which was described as a "canyon city" by early explorers.

2. In 1935, on September 13, the first commercial airline flight over the Rocky Mountains took off from Denver's Union Station. The flight was operated by United Airlines and flew to Salt Lake City, Utah.

3. On September 13, 1969, the Kansas City Chiefs played the Denver Broncos in the first professional football game played at Mile High Stadium. The Broncos won the game 25-13.

4. Colorado's first governor, John Hickenlooper, was sworn in on September 13, 2011. Hickenlooper served two terms as governor, from 2011 to 2019.

5. On September 13, 2013, severe flooding occurred in Colorado, causing widespread damage and destruction. The floods caused 10 deaths, destroyed thousands of homes, and caused billions of dollars in damage.