The U.S. Mint's bicentennial commemorative quarter for Colorado; Colorado became the 38th state in 1876. The Colorado quarter features the Rocky mountains, pine trees, and one of the state's nicknames: Colorful Colorado. Photo by United States Mint/Wikipedia (Public Domain Image).
The Centennial State
Colorado's official nickname is The Centennial State because it became the 38th state of the United States in 1876 (one hundred years after the signing of the Declaration of Independence). State Nicknames Statehood Dates
Another well- known nickname is "Colorful Colorado" because of the state's magnificent scenery of mountains, rivers and plains.