1. The deadliest avalanche in Colorado history occurred on October 13, 1906, in the Rocky Mountains. More than 150 people were killed in the tragedy, which was caused by a series of heavy snowstorms and high winds.

2. On October 13, 1917, the first recorded snowfall of the season hit Denver, Colorado. The snowfall totaled just over 3 inches and served as a reminder that winter was well on its way.

3. In 1967, the Colorado Rockies Professional Hockey Club was founded on October 13. The team played in the National Hockey League from 1976 until 1982, when they moved to New Jersey and became the Devils.

4. On October 13, 1999, a massive hailstorm hit the Denver metropolitan area, causing over $1 billion in damage. The storm was so severe that it was classified as a "once-in-a-century" event.

5. In 2013, the Colorado Department of Transportation closed a section of the US 36 highway due to flooding caused by a heavy rainstorm that occurred on October 13. The storm caused significant damage to roads and infrastructure throughout the state.