Our site uses profiling cookies, also from third parties, to send advertising according to your preferences.
Please, click here to get more information or to deny your consent to all or certain cookie. Closing this banner, scrolling the page or clicking on any of its elements you may consent to the use of cookie.
Sentinel Peak, more commonly known as "A" Mountain, is a prominent ridge in the Tucson Mountains west of Tucson. The peak is made up of a series of volcanic rocks that represent different types of volcanic activity, though the mountain itself is not a volcano.
The mountain is more recently known as "A" Mountain because it features a large, painted, man-made basalt rock formation in the shape of the letter "A". Originally built by University of Arizona students, the "A" is maintained by student organizations at the school and has traditionally been painted white. After September 11, 2001, the "A" was painted red, white, and blue, which are the school colors, but primarily was a show of patriotism. Since then, the "A" has not returned to its previous white. On St. Patrick's Day, the "A" is sometimes painted green.