Trimesters last twelve weeks. Grayson County High School offers board-based curriculum which includes college level dual-credit and Advanced Placement courses. Once a month, FFA, DECA, Film Club and Students Against Destructive Decisions meet at the school. To graduate from GCHS, a student must earn at least 26 credits, complete at least 7½ semesters, and complete a writing portfolio. Students must meet the following specific requirements:  Usually, students graduate at the end of their senior year in May or June depending upon weather and other factors. However, some students take the option of graduating early, halfway through their senior year, in December. GCHS students must take the basic curriculum, including courses in Social Studies, English, Science, Math, Humanities, and Health. There are also numerous electives offered in those subjects, such as Political Science, Microbiology, Music Theory, and Anatomy. These classes are not required for graduation, but can be useful for further study in college and in life. Students can also take electives in subjects such as Agricultural Education, Life Skills, Foreign Language (which is strongly encouraged for college bound students), and Visual Arts. The Grayson County Technology Center offers various vocational classes such as Welding, Carpentry, and Marketing. The school also offers 11 AP classes. These include Human Geography, United States History, European History, Environmental Science, Chemistry, Biology, English Language, English Literature, Calculus, Studio Art, and French. The AP classes offer a weighted GPA for students, and a more advanced and in-depth look at subjects that wouldn't get as much coverage in the regular forms of those classes. The school also offers dual credit courses through Elizabethtown Community and Technical College, Western Kentucky University, Morehead State University, Somerset Community College, and Maysville Community College. These classes include European History 104, European History 105, English 101, English 102, Astronomy 101, Speech 145, College Algebra, Trigonometry, Calculus, and Contemporary Math. These classes serve as an opportunity for students to receive college credit while taking classes from Grayson County High School teachers. The school has been able to move past its internal rivalries and compete with external foes in various competitions. Both the boys' and girls' tennis teams have won several regional titles and are perennial regional favorites. The softball team has been very successful as well, even making ranking of No. 1 in the state and No. 25 in the nation. It has developed a strong rivalry with the other regional powerhouse, Owensboro Catholic.