Climate change has posed serious challenges to society. In order to tackle with these challenges, governments have implemented various environmental policies. However, prior studies suggest that these environmental policies rather cause public backlash, even though their success largely rests on voters' support and cooperation for environmental protection. How can public support and pro-environmental behavior of voters be promoted? In this study, I argue that electing a female mayor contributes to the activation of the environmental norms and the promotion of pro-environmental behavior. Using data on organic farming in France and a close-election regression discontinuity design, this study shows that electing a female mayor promotes environmentally friendly agricultural practices of farmers, a social group which incurs unequal costs for environmental protection. The result reveals that the electoral victory of a female mayor increases a proportion of agricultural fields dedicated to organic farming in a municipality. This study also demonstrates that the positive effect of a female mayor is pervasive even outside of agricultural fields: the establishment of electric vehicle (EV) charging stations. Additionally, this study shows that farmers' transition to organic farming is not driven by their economic interests and by initiatives led by a local authority. This study implies that local political changes, like municipal elections, are sufficient for the activation of the environmental norms and the promotion of pro-environmental behavior of voters.