High school underrepresented minority students in the US are at an increased risk of dropping out of the STEM pipeline. Based on expectancy-value theory, we examined if Latino students? perception of support from parents, siblings/cousins, teachers, and friends in 10th grade predicted their science ability self-concepts and values, which in turn predicted their classroom engagement. Survey data were collected from 104 Latino high school students and their science teachers. The findings suggest that adolescents? perceptions of overall support and home-based support predicted adolescents? science ability self-concepts at 10th grade while controlling for their 9th grade self-concepts. Although adolescents reported high support from teachers, teacher or school-based support alone was not a strong correlate of their motivational beliefs. Perceived support was indirectly related to classroom engagement through adolescents? ability self-concepts. Feeling supported across home and school may be necessary to sustain adolescents? science motivational beliefs and, in turn, their science classroom engagement.

This study explores ways to support girls of color in forming their senses of selves in science, technology, engineering, and math (STEM) during the middle school years. Guided by social practice theory, we analyzed a large data set of survey responses ( n = 1,821) collected at five middle schools in low‐income communities across four states in the United States. Analyses focus on the extent to which key constructs that inform girls’ development of senses of self and relations among those indicators of STEM identities varied by their race/ethnicity. Though the means of indicators sometimes varied across racial/ethnic groups, multigroup structural equation modeling analyses indicate no significant racial/ethnic differences in the relations of STEM identities, suggesting that similar supports would be equally effective for all girls during the middle school years. Girls’ self‐perception in relation to science was the strongest predictor of their identification with STEM‐related careers, and this self‐perception was positively and distinctively associated with their experiences with science at home, outside of school, and in school science classes. This study argues for strategically expanding girls’ experiences with science across multiple settings during middle school in a way that increases their positive self‐perception in and with STEM.