Vitoria-Gasteiz, the capital city of the bilingual Basque Autonomous Community of Spain, is a largely Spanish-speaking city: over 90% of the city's population claims Spanish as their native language and less than one-fifth of the city's adult population is bilingual in Basque and Spanish (compare with more than one-third of the population of San Sebastián). Nevertheless, enrollment in Basque immersion (Model D) schools has grown over the last three decades and continues to grow. As of the 2018-2019 school year, 80% of primary and secondary public school students in the Basque Autonomous Community were enrolled in Model D schools. The goal of this study was to investigate the linguistic attitudes of primary school teachers in different school models in Vitoria-Gasteiz for the purpose of identifying factors in the positive growth of Basque as a minority language, as well as current challenges for growth, in this sociolinguistically adverse environment. Results are then related to opportunities and challenges for other minoritized languages undergoing language revitalization.