Data from 318 diverse high school students from three different types of high schools in the United States were collected. School types varied by location (e.g., suburban, urban), size, and student demographics (e.g., race, ethnicity, socioeconomic status). Exploratory Factor Analysis (EFA) was conducted to examine the factor structure of the STRESS-Y. Mean comparisons were performed to assess variations in Racial Stress Appraisal across different school types. The EFA of the STRESS-Y confirmed its factor structure, supporting its validity as a measure of RSA in youth and we were able to extract two robust factors--Racial Threat Appraisal and Racial Support Appraisal. Mean comparisons revealed that Racial Threat Appraisal and Racial Support Appraisal varied across different school types, highlighting the influence of school context on students' experiences of racial stress. This study provides evidence for the validity of the STRESS-Y as a measure of Racial Stress Appraisal in youth. The findings demonstrate the importance of considering school type as a factor influencing students' experiences of racial stress as well as how support, racial coping, and stress management skills may help mitigate ongoing interpersonal harm that youth are experiencing. The validated measure and the understanding of the factors contributing to Racial Stress Appraisal can inform interventions aimed at supporting students in managing and coping with racial stressors in their respective school environments.