Increasing use of tiered service delivery models that include universal, whole-class programming, is reshaping school-based speech-language therapists (SLTs)' roles in supporting inclusive education. Interactive reading programs, designed to enhance language and literacy skills of diverse learners, offer SLTs an evidence-based means to promote inclusive practices. However, SLTs' experiences in implementing such programs requires further investigation, particularly within Canadian francophone contexts. This qualitative study examined the experiences of seven SLTs across two Canadian francophone contexts--minority and majority--about their roles in implementing an interactive reading program. Through semi-structured interviews and focus groups, a reflexive thematic analysis revealed two overarching themes. The first, "Key factors contributing to success co-exist amidst challenges," included four primary themes: SLT-teacher partnership as fundamental to effective collaboration; a centralized mandate and coordinated implementation of the program as key; the value of a well-structured program while maintaining a flexible approach; and the challenging journey of overcoming resistance to change. The second, "Unexpected benefits for school-based SLT practice," highlighted three primary themes: benefits for SLTs' own professional development; benefits for SLTs' roles within the educational context; and paving the way for future opportunities. Study findings offer insights into facilitating SLTs' vital role in promoting inclusive education.