The culture represented at Mesa Verde reflects more than 700 years of pre-Columbian history. From approximately 600 through 1300 CE, people lived and flourished in communities throughout the area, eventually building elaborate stone villages in the sheltered alcoves of the canyon walls. Today most people call these sheltered villages "cliff dwellings". The cliff dwellings represent only the last 75 to 100 years of occupation at Mesa Verde. In the late 1200s, within the span of one or two generations these people were forced by a change in the weather to leave their homes and walk away.
The archaeological sites found in Mesa Verde are some of the most notable and best preserved in the United States. Archaeologists study the ancient dwellings of Mesa Verde, in part, by making comparisons between the Ancestral Pueblo people and their contemporary indigenous descendants who still live in the Southwest. Twenty-four Native American tribes have an ancestral affiliation with sites in the Mesa Verde area.
There is evidence the Mesa Verde area was first populated about 8,000 years ago. When the temperature rose about 7,000 years ago, the population in the entire region rose dramatically. With the introduction of a good maize kernel about 3,000 years ago, larger population centers grew in the lowlands around the mesa. Atlatls for hunting were in use and the Basketmaker I period was giving way to the Basketmaker II period. Around 500 CE the Basketmaker II period was giving way to Basketmaker III. Atlatls were being swapped for bow and arrow, baskets were being swapped for pottery. By about 600 CE, the people were doing their cooking in clay pots and gathering in small communities of pithouses.
The first pueblos were started around 650 CE but most people lived in pithouses for another couple hundred years. There might have been about 1,500 people on the mesa when new varieties of beans and corn were introduced around 700 CE. By 850 CE, more than half the people on the mesa lived in stone dwellings above ground. Most pithouses had become kivas for one ceremony or another. Maybe half of the interior space of a pueblo was for grain storage as the people tried to hoard enough grain to last at least three years. By about 860 CE, there were around 8,000 people living in the Mesa Verde area but by 880, the population was in steady decline: the irregular rainfall had turned against the people and they were too dependent on it. The majority of people at Mesa Verde migrated south and took up residence in Chaco Canyon. In 950 CE, the archaeological time clock turned over: Pueblo I became Pueblo II.
For 200 years of the Pueblo II period, Chaco Canyon was the primary center of Ancestral Puebloan culture. There were still people living at Mesa Verde but the population was way down until the rainfall began to pick up in the early 1000s CE. By 1050 people began migrating back to Mesa Verde from Chaco.
Around 1075 the people began building the first Chaco-style masonry buildings at Mesa Verde. Far View House, the largest of these, is thought to be a classic Chaco outlier on which construction began somewhere between 1075 and 1125 CE. Then drought set in again down south and by 1150, Chaco Canyon was almost completely deserted.
Many of the people from Chaco moved north to the new pueblo built beside the Animas River at Aztec. Others continued on past Aztec and returned to Mesa Verde.
Major construction at Mesa Verde was paused from about 1175 to about 1200 but then several multi-storied stone buildings with hundreds of rooms for hundreds of inhabitants were built. There were maybe 22,000 people living in the Mesa Verde area in 1200. The population boomed from 1225 to 1260 as the Aztec area was being abandoned, too. By 1250 more than half the people at Mesa Verde were living in large, multi-story stone structures built into the cliffs and under overhangs. Then the Great Drought hit the Colorado Plateau in earnest in 1276. For a few years construction was funneled into building defensive stone towers and walls around each of the Great Houses as the pueblos raided each other for food and grain. Then all construction stopped and people started to leave in droves.
By 1285 the Mesa Verde area was almost deserted. The majority of the folks were headed southeast to the Jemez Mountains, Chama River Valley, Pajarito Plateau and the northern Rio Grande Valley. Others opted to go southwest to the Hopi mesas or further south to the Zuni River Valley. The landscape was open and empty for a hundred years, then the Utes arrived. Right behind them came the Navajos, Apaches and Spaniards.
The ruins at Mesa Verde were undisturbed until the 1880's when Euro-American explorers started to find them in the lower canyons. It wasn't until 1888 that Richard Wetherill and Charlie Mason rediscovered Cliff Palace and let the cat out of the bag. That set off almost 20 years of continuous looting of this area of indigenous history before President Theodore Roosevelt created Mesa Verde National Park in 1906 to protect the artifacts still left and the ancient pueblos that still rise above them.