The U.S. Supreme Court heard arguments on October 5, 2026, in Suncor Energy (U.S.A.) Inc. v. County Commissioners of Boulder County, No. 25-170. As of October 7, the Court has not issued a decision. It is considering whether federal law precludes Boulder’s state-law climate claims and whether the Court has jurisdiction to review the case now.
What is the Supreme Court deciding in the Boulder climate case?
The Court is considering two separate questions. The first concerns federal preemption: whether federal law prevents state-law claims seeking relief for injuries allegedly caused by the effects of interstate and international greenhouse-gas emissions on the global climate. The second is whether the Supreme Court has statutory and Article III jurisdiction to review the case at this stage, before a final judgment on the underlying claims. The Court added the jurisdiction question when it agreed to hear the case on February 23, 2026.
Neither question asks the Court to decide whether the defendants are liable for Boulder’s alleged losses. Preemption concerns whether the claims may proceed under state law; jurisdiction concerns whether the Supreme Court may review the state-court ruling now.
What is Boulder’s lawsuit about?
Boulder County and the City of Boulder filed the lawsuit in Colorado state court on April 17, 2018. San Miguel County was also an original plaintiff, but its claims were transferred to another venue. The local governments allege that fossil-fuel companies’ production, promotion, refining, marketing and sale of fossil fuels contributed to climate change and caused harm to local property and residents.
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The plaintiffs seek damages under Colorado common-law claims that include public nuisance, private nuisance, trespass, unjust enrichment and civil conspiracy. These are allegations, not findings that the companies caused particular losses or are legally responsible for them.
How the parties frame the dispute
Boulder County describes its suit as seeking accountability for climate-related damages, not as an effort to regulate emissions or stop fossil-fuel production. The companies argue that the claims implicate a global problem that cannot be resolved through state-law lawsuits. Those are competing descriptions of the case; the Supreme Court’s immediate questions are preemption and jurisdiction.
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What did the Colorado Supreme Court decide?
On May 12, 2025, the Supreme Court of Colorado concluded that federal law did not preempt Boulder’s claims and sent the case back for further proceedings. It wrote: “We now conclude that Boulder’s claims are not preempted by federal law and, therefore, the district court did not err in declining to dismiss those claims.”
That was the Colorado Supreme Court’s ruling on the preemption challenge, not a decision by the U.S. Supreme Court. It also did not determine whether Boulder can prove causation, damages or liability.
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What could the Supreme Court’s decision mean for the case?
The possible outcomes turn on two axes: whether the Supreme Court can review the state-court ruling now, and, if it can, whether federal law precludes the claims. A ruling that allows the case to continue past the current challenge would not decide the factual merits.
| Supreme Court outcome | What it would mean at this stage |
|---|---|
| The Court finds it lacks jurisdiction to review the case now | The Court would not resolve the preemption question in this review. The Colorado ruling would remain in place at this stage, and the case could continue through state-court proceedings. |
| The Court has jurisdiction and finds the claims preempted | The federal-law defense would prevent the state-law claims at issue from proceeding. |
| The Court has jurisdiction and rejects preemption | The claims could proceed past the federal-preemption challenge, but causation, damages and liability would remain unresolved. |
The case may influence how other state-court climate-damages suits are treated, but its broader effect will depend on the Court’s reasoning and how later courts apply it.
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Why is the Marshall Fire mentioned in coverage?
The Associated Press reported in 2026 that the 2021 Marshall Fire destroyed nearly 1,100 homes, killed two people and caused an estimated $2 billion in total damage. Boulder filed its lawsuit in 2018, before the fire; the fire was not part of the original complaint. Those figures provide context about a local disaster, but they do not establish that the defendants caused the fire or are liable for its losses.
Boulder County’s case page identifies extreme heat, wildfires, drought and poor air quality as local climate concerns. That list reflects the county’s account, not judicial findings about the causes of any particular event or harm.
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