The learning collaborative (LC), a multi-component training and implementation model, is one promising approach to address the need for increased availability of trauma-focused evidence-based practices. The current study used data from four cohorts of a statewide LC on Trauma-Focused Cognitive Behavioral Therapy (TF-CBT) to 1) evaluate pre- to post-LC changes in therapists’ perceived competence in delivering TF-CBT and 2) explore therapist and contextual factors related to therapists’ perceived TF-CBT competence. Therapists (N = 237) completed pre- and post-LC measures of practice information, interprofessional collaboration, organizational climate, and TF-CBT knowledge, perceived competence, and use. Findings indicated therapists’ perceived TF-CBT competence significantly increased, pre- to post-LC (d = 1.31), with greater use of trauma-focused practices at pre-training and more TF-CBT training cases completed predicting greater pre- to post-LC gains in perceived TF-CBT competence. These findings highlight the need to assist therapists in identifying and completing training cases to promote competence and implementation.