The summer of 2009 marked the beginning of large-scale excavations at Gabii carried out by the Gabii Project. With the plan produced by the geophysical survey in hand, two excavations areas were chosen; one of them on the slope of the Castiglione crater to the northeast of the Iuno Gabina sanctuary and the other to the south of the modern via Prenestina.

Over the course of 8 weeks, these areas were cleared and excavation commenced, with the main activity in 2009 concentrated on the more northerly of the two study areas; in the southern area test trenches were opened. Within the main area of investigation was a strong magnetic anomaly detected during the survey that appeared to be a side street in the urban grid, and this feature helped determine the placement of the excavation area. One immediately visible archaeological feature was the side street that had been identified by survey. This street, which should go on to join the main trunk road of the city center, has already demonstrated multiple phases, including preliminary evidence that suggests the initial road bed dates to the fifth century B.C. Other preliminary findings include a possible industrial complex ranging from Late Republican to early Imperial in date, as well as a growing number of Late Roman inhumations that clearly represent a decisive shift in the usage of the urban space, and possibly reflect the overall contraction of the occupied portions of the city as suggested by the surface survey carried out by M. Guaitoli in the late 1970s.

In 2010 excavations will continue, probing the already open areas and expanding them to expose even more salient archaeological features.