| 1100-1300 | Stockaded village occupied by Indians of the Middle Mississippi culture at some time during this period. |
| 1835 | Aztalan discovered by Timothy Johnson. |
| 1850 | Survey of Aztalan made by Increase A. Lapham. |
| 1919, 1920, 1932 | First scientific, and still most comprehensive, excavation of the site by Dr. S. A. Barrett. |
| 1920 | Aztalan "Princess" burial discovered by Dr. S.A. Barrett. |
| 1949 | Excavations directed by David A. Baerreis and Dr. Chandler W. Rowe. New features found included house forms not previously located; original features, such as stockade lines, were relocated so that reconstruction of the walls could proceed in exactly the same position as the original. |
| 1950 | Continuation of basic exploration of the site under the direction of Dr. Moreau S. Maxwell. |
| 1951 | Crew under Robert F. Maher conducted excavations of the southwest pyramidal mound to determine its precise limits and size and restored the mound. |
| 1952 | Reconstruction of the first portion of the stockade (southeast corner). |
| 1954 | Excavation directed by Dr. Chandler W. Rowe. Crematorium discovered in northwest pyramid mound; stockade line around southwest pyramidal mound excavated; main entrance to stockade discovered by Warren L. Wittry; northwest pyramidal mound restored. |
| 1958 | Houses excavated by Dr. Chandler W. Rowe. |
| 1962 | Excavation directed by Dr. Joan E. Freeman and William M. Hurley. The stockade line on the south and west sides of the enclosure was relocated. |
| 1967 | Excavation directed by Dr. Joan E. Freeman and J.B. Brandon. Houses and refuse pits were excavated; the village deposit under the northeast pyramidal mound was excavated; unreconstructed portions of the stockade line were permanently marked for future use. |
| 1968 | Excavation directed by Dr. Joan E Freeman and J.B. Brandon. Further excavation of the northeast pyramidal mound; completion of plans for an outdoor interpretive exhibit. |