1. Battle of the Big Hole: On October 10, 1877, a battle occurred between the US Army and the Nez Perce tribe in the Big Hole Valley of Montana. Many of the soldiers involved were from Fort Logan, which is now a residential area of Denver.

2. Colorado Springs founder's birthday: On October 10, 1833, General William Jackson Palmer was born. He later founded Colorado Springs and the Denver and Rio Grande Western Railroad, which played a major role in the development of the state.

3. October Snowstorm: In 2019, on October 10-11, an early season snowstorm brought heavy snow to many parts of Colorado. Some areas received up to 24 inches of snow, causing widespread power outages and travel disruptions.

4. Rocky Mountain News founded: On October 10, 1859, the first edition of the Rocky Mountain News was published in Denver. It was one of the most influential newspapers in the state's history and operated until 2009.

5. "Denver Spider-Man" arrested: On October 10, 2017, a man known as the "Denver Spider-Man" was arrested after scaling a downtown building. His real name is Daniel Goodwin and he has climbed many buildings across the country to raise awareness for various causes.