Trincheras Hill, Archaeological ruins on mountain in Northern Sonora, Mexico.

Trincheras Hill is an archaeological site on a mountain in Northern Sonora featuring stone walls and terraced formations at multiple elevations. These structures include plazas, residential areas, and fortified positions arranged across the steep slope.

The village on the hill was occupied during the Trincheras IV phase, roughly 1300 to 1450 CE, and gave its name to the wider Trincheras culture of northwestern Sonora. In the 17th century Juan Mateo Mange reached the already abandoned site and called the slope walls trincheras, taking them for military works. The valley's inhabitants at that time were Pima and Pápago.

The structures here show how residents connected farming with defense by using the steep slopes strategically. This arrangement reveals a community that understood its surroundings and shaped life around natural conditions.

The site lies just south of Trincheras town, and the climb gains about 170 metres over terraced slopes. The upper path to El Caracol, on the eastern summit plaza, is the steepest and narrowest section. Carry water and sun protection; the desert slope offers little shade.

The name "Trincheras" comes from Juan Mateo Mange, a European who reached the hill in the 17th century, when the village was already abandoned. He took the stone walls on the slopes for military trenches, and the mistaken label stuck to the hill and the culture. The site rises 170 metres above the desert floor and covers more than 120 hectares.