On August 3, 2019, the State of New Hampshire passed Senate Bill (S.B.) 285 to establish a coastal resilience and economic development program and provide local governments with innovative new tools to address climate emergencies due to sea-level rise, storm surge, and flooding. One notable provision of the bill allows municipalities to either alter their existing boundaries or create a new municipality by combining existing ones (Section 2). Another notable provision allows municipalities to establish Joint Municipal Development and Revitalization Districts, which may include land from several municipalities, to create agreements to share tax revenues and expenditures across jurisdictions (Section 3). The bill provides an example of an innovative state law supporting local governments to overcome governance challenges when adapting to climate change impacts that pose cross-jurisdictional challenges, including coordinating regional responses to sea-level rise and sharing tax revenues and the associated costs of these responses. Other states might consider authorizing similar tools for annexation or multi-jurisdictional districts to aid local governments confronting these emerging issues and improve cross-jurisdictional resilience to sea-level rise and other coastal hazards.