| Colorado beetle () A yellowish beetle (Doryphora decemlineata), with ten longitudinal, black, dorsal stripes. It has migrated eastwards from its original habitat in Colorado, and is very destructive to the potato plant |
| Colorado group () A subdivision of the cretaceous formation of western North America, especially developed in Colorado and the upper Missouri region. |
| Colorado potato beetle / Colorado beetle / potato bug / potato beetle / Leptinotarsa decemlineata black-and-yellow beetle that feeds in adult and larval stages on potato leaves, originally of eastern Rocky Mountains, now worldwide |
| Colorado / Centennial State / CO a state in west central United States in the Rocky Mountains |
| Colorado Springs a city in east central Colorado on the eastern edge of the Rocky Mountains, popular tourist center and site of the United States Air Force Academy |
| Denver / Mile-High City / capital of Colorado the state capital and largest city of Colorado, located in central Colorado on the South Platte river |
| Colorado Desert an arid region of southeastern California |
| Colorado / Colorado River an important river in the southwestern United States, rises in the Rocky Mountains of northern Colorado and flows southwest through Utah into Arizona (where it flows through the Grand Canyon) and then southward through the southern tip of Nevada, then forming the border between California and Arizona and finally into Mexico where it empties into the Gulf of California, the main source of water in the southwestern United States |
| Colorado Colorado River a river in Texas, flows southeast into the Gulf of Mexico |
| Colorado Plateau a large plateau to the south and west of the Rocky Mountains, abuts mountains on the north and east and ends in an escarpment overlooking lowlands to the south and west, the Grand Canyon is carved out of the southwestern corner |
| white fir Colorado fir / California white fir / Abies concolor / Abies lowiana medium to tall fir of central to western United States having a narrow erect crown and soft wood |
| Colorado spruce / Colorado blue spruce / silver spruce / Picea pungens tall spruce with blue-green needles and dense conic crown, older trees become columnar with lower branches sweeping downward |