We examined parent participation in the context of a going-to-scale implementation trial of the evidence-based, multi-component Early Risers conduct problems prevention program. In this study we examine the participation of parents in two parent/family-focused components of Early Risers that were delivered over 2 years across 21 rural school sites with 155 primarily Caucasian families. One component is a standardized "Parent Skills" curriculum delivered at participating schools and the second component delivers "Family Support" via tailored case management services through school and non-school site contacts. The study examines predictors of parent participation for each parent-focused component using multilevel modeling analyses. Previous research is extended by examining parent participation within the context of a going-to-scale trial and by looking at a broader array of child/parent/family and implementation context predictors. Parent participation in Parent Skills is predicted by higher level of parent's frustration in parent-child relationships, while their participation in Family Support is related to lower family income. Implementers with higher previous work experience with children/families and lower education levels, as well as those manifesting more extroverted and less agreeable personality characteristics, elicit more participation in Parent Skills. Greater participation in Family Support is also predicted by lower levels of implementer neuroticism. Finally, implementers who achieve higher quality of delivery fidelity have greater participation in Parent Skills and a lower level of adherence fidelity predicts more participation in Family Support. The results are discussed within the context of going-to-scale service provision and in terms of implications for future prevention efforts.