[2] Santa Gertrudis was formally established in 1917 as one of three schools associated with the King Ranch in South Texas.
Today, Santa Gertrudis (now SGISD) is the only remaining school facility associated with the King Ranch.
Santa Gertrudis ISD is fully accredited by the Texas Education Agency and has operated as an independent school district since 1942.
In 1993, Santa Gertrudis began accepting nonresident transfer student from other area districts (before then the school was intended solely for children of King Ranch employees).
[7] The non-traditional approach offers each student a program developed to meet individual needs and capabilities.
Since students are allowed to progress at a pace conducive to their abilities, they can master course requirements and move on to the next higher level of work.
Through support from Texas A&M University Kingsville, qualified students are able to begin college courses starting in the ninth grade.
In the 2002–2003 school year, academy, working in collaboration with Coastal Bend College, established an Advanced Studies Program, offering students the opportunity to graduate high school with an Associate of Applied Science Degree in Computer Information Technology.
Students also have the opportunity to take courses at Texas A&M University Kingsville, to earn credits applicable towards a four-year degree.
In 2005, due to the Advanced Studies Program, three students graduated with both a high school diploma and an associated degree from Coastal Bend College.