This article examines how opposition parties in competitive authoritarian regimes can leverage subnational executive offices to defeat autocrats. While existing research emphasizes coalition-building as a central strategy for opposition success, this study highlights the pivotal role of subnational electoral victories in shaping national-level outcomes. I argue that controlling subnational executive offices enhances the opposition’s chances by signalling regime vulnerability and increasing the belief that national-level victory is achievable. Moreover, winning these offices also contribute to opposition success by fostering coalition-building, as perceptions of regime weakness make coalitions more likely. The study supports these arguments with an original dataset covering 1990–2022 and employing a probit model, mediation analysis, and regression discontinuity design. These findings offer new insights into opposition strategies and electoral dynamics in authoritarian regimes.