A long line of research shows that sexual minority adolescents experience bullying and victimization at higher rates than heterosexual youth. More recently, attention has been given to sexual minority adolescent's experiences and the impact on mental health during key periods of adolescence. Although this work is immensely valuable in understanding experiences of bullying and associated mental health outcomes, we still know little about the development of bullying for sexual minority adolescents: When do disparities emerge? And do they persist over time?