The Rio Grande Greek system's fraternity and sorority chapters are governed by the All Greek Council, an organization composed of representatives from each fraternity and sorority. There are nine social fraternities and sororities on campus. Membership is by invitation with each group sponsoring parties during a formal rush period to help acquaint students with the groups. Each group promotes scholarship, social activities, personal development and service. A student must have completed 12 credit hours at the University or Community College while maintaining a Grade Point Average of 2.00 to be eligible to pledge an organization.