The Presidio Trail is a 2 ½ mile long loop trail through downtown Tucson that highlights structures and sites of historic interest and is marked by a turquoise stripe on the sidewalk. It begins at the site of the northeast corner of the reconstructed Presidio San Agustin del Tucson, founded in 1775. This presidio or fort was the first European structure in urban Tucson , constructed by the Spanish to mark the northern frontier of the Spanish empire in the Americas .

The trail was created by the Tucson Presidio Trust for Historic Preservation, a Tucson nonprofit organization, which is also involved with the operation of the presidio.

(The Trail is nicknamed the Turquoise Trail because of the color of the stripe on the sidewalk)