Calabazas Mission, Spanish mission ruins near Nogales, United States

Calabazas Mission is a ruined Spanish Jesuit mission near Tumacácori, Arizona, set on bluffs east of the Santa Cruz River upstream of Sonoita Creek. Only a roofless adobe shell remains; Father Norman Whalen's volunteers capped the adobe walls and added a concrete foundation in 1960.

Jesuit missionary Francisco Xavier Pauer re-established the mission in 1756, moving at least 78 O'odham from Toacuquita to a site on the bluffs east of the Santa Cruz River. Apache raids in 1777 and 1830 led to its abandonment by 1786 and later reuse as a ranch. In September 1865 the Union Army garrison from Tubac was transferred here and the post was named Fort Mason.

The mission grounds show how Spanish missionaries, Tohono O'odham farmers, and later settlers from different regions came together in this space. These different groups shaped the land and buildings over many generations.

Visiting requires advance reservations and a guide from the National Park Service, especially during the winter months through Tumacacori National Historical Park. It is best to wear comfortable shoes and be prepared for uneven, open ground.

The complex was rebuilt and expanded multiple times, showing how persistent the different residents were in maintaining it. These reconstructions left different building marks that visitors can still see in the remains today.