1. On August 18, 1876, Colorado was admitted as the 38th state in the United States. It was the first state to grant women the right to vote by popular referendum, and its capital city, Denver, was nicknamed the "Queen City of the Plains."

2. On August 18, 1991, the town of Nederland experienced a major flash flood that killed two people and caused millions of dollars in damage. The flood was caused by heavy rain that overwhelmed the town's infrastructure and destroyed several buildings.

3. On August 18, 1959, the Central City Opera House Association was established in Central City, Colorado. The association presented its first opera that same year and has since become one of the most renowned opera companies in the country.

4. On August 18, 2013, a massive flood hit Colorado's Front Range region, causing significant damage and loss of life. The flood was the result of heavy rains that fell over a period of several days, and it impacted over 20 counties in Colorado.

5. On August 18, 1969, the Woodstock Music and Art Fair took place in Bethel, New York. Although the event occurred outside of Colorado, it had a significant impact on the state's countercultural movement, which was thriving at the time. Many Colorado residents attended the festival and were inspired to create their own music and art communities.