Mater Dei Catholic Elementary in Chula Vista's Otay Ranch neighborhood is the first Catholic school in San Diego County to offer a 50/50 dual-language Spanish-English immersion curriculum, serving TK through eighth grade on Magdalena Avenue. The STREAM model — Science, Technology, Religion, Engineering, Arts, and Math — anchors instruction within the Diocese of San Diego, and graduates feed directly into Mater Dei Catholic High School on the adjacent campus. Students earn the California Seal of Biliteracy at both the fifth- and eighth-grade levels, a benchmark reinforced by a capstone Bilingual Portfolio requirement before promotion. Visual and Performing Arts programming covers acting, dance styles, and drawing technique, complementing the structured movement training available at San Diego Gymnastics & Parkour Otay Ranch. The 440-student campus maintains an average class size of 23 and assigns a dedicated Spanish-language core teacher paired with an English-language counterpart for each grade level.