Today's schools are more culturally and linguistically diverse than ever before, prompting the need for teachers with the requisite expertise for work with emergent bilingual learners. As students grow in numbers and fill seats in classrooms spanning grades and disciplines, teacher educators must consider ways to prepare an increasing number of teachers, including those spanning licensure areas. This research probed one university's efforts to prepare all teacher candidates for this growing subgroup of students through a field-based undergraduate teacher education program in the urban Midwest. Using artifact data from 29 program completers and survey and interview data from five focal teachers spanning licensure areas, this study investigated how particular facets of the field-based program promoted or deterred candidates' learning across the 4-year program and into teachers' first year of teaching. Implications center on how universities can leverage field-based teacher education to prepare future teachers for diverse classrooms.