Pueblo I period
| Ancestral Pueblo periods | 
|---|
| Archaic–Early Basketmaker 7000–1500 BCE | 
| Early Basketmaker II 1500 BCE–50 CE | 
| Late Basketmaker II 50–500 | 
| Basketmaker III 500–750 | 
| Pueblo I 750–900 | 
| Pueblo II 900–1150 | 
| Pueblo III 1150–1350 | 
| Pueblo IV 1350–1600 | 
| Pueblo V 1600–present | 
The Pueblo I period (750 to 900) was the first period in which Ancestral Puebloans began living in pueblo structures and realized an evolution in architecture, artistic expression, and water conservation.
Pueblo I, a Pecos Classification, is similar to the early "Developmental Pueblo period" of 750 to 1100. It is preceded by the Basketmaker III period, and is followed by the Pueblo II period.