Last mentioned: Feb 24, 2026
SCOTUS Hearing
The Supreme Court agrees to hear oral arguments in the appeal, escalating the case to the highest level.
SCOTUS Petition
ExxonMobil and Suncor petition the U.S. Supreme Court to review the jurisdictional question.
10th Circuit Ruling
The appeals court affirms that the case belongs in state court, rejecting the energy companies' jurisdictional arguments.
Lawsuit Filed
Boulder and San Miguel County file suit against ExxonMobil and Suncor in Colorado state court.
The U.S. Supreme Court has agreed to hear an appeal in a long-running climate liability lawsuit filed by the city and county of Boulder, Colorado. The ruling could determine whether dozens of similar local climate cases across the country can proceed in state courts or must be dismissed under federal law.