Is the valedictorian title based on all four years?

Yes, the valedictorian title is based on all four years. Typically, the title will be determined through the weighted GPA of all four years of school. That means if you had high achievements as a sophomore, but fell behind as a senior, both of those performances will have an equal impact on your ability to earn valedictorian.

Keep in mind that honors classes, AP classes, and summer classes can also play a role. If you take any of these or multiple of these, your scores will also have an impact on your weighted GPA.