This article analyzes the critical language awareness (CLA) of Spanish university-level students who were enrolled in a 16-week Spanish heritage language (SHL) course, using CLA as an instructional approach. Students’ attitudes towards bilingualism, Spanglish, language variation, and prescriptivist grammar were measured via pretest and posttest surveys that used a four-point Likert scale of strongly agree, agree, disagree, or strongly disagree, along with a text box asking participants to explain their answers. The CLA instructional methods delivered in the course included the analysis of code-switching grammar constraints, the study of standard language ideologies and monolingual language ideologies, the analysis of stigmatized grammar features found in varieties of Spanish, and English-influenced lexicon. Ten out of fourteen items were included in a factor analysis which yielded a statistically significant change between pretest and posttest. Qualitative analysis of answer explanations showed that some students adapted their language ideologies to the new information and did not change their beliefs at a deep level. Future CLA research should identify “CLA proficiency” levels as well as how to differentiate for students who hold deeply entrenched language ideologies.