List of prehistoric sites in Colorado includes historical and archaeological sites of humans from their earliest times in Colorado to just before the Colorado historic period, which ranges from about 12,000 BC to AD 19th century. The Period is defined by the culture enjoyed at the time, from the earliest hunter-gatherers, the Paleo-Indians, through to the prehistoric parents to the modern Native Americans.
There were more than 56,500 recorded prehistoric sites in Colorado by 1996. Important historic and archaeological sites are registered nationally with the National Register of Historic Places (National register) and within the state's Colorado State Register of Historic Properties (State register). Most of the sites below are registered in one more both registers and was the source for most of the information for this section: