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The U.S. Supreme Court is scheduled to hear Suncor Energy (U.S.A.) Inc. v. County Commissioners of Boulder County, No. 25-170, on October 5, 2026. The case asks whether federal law bars state-law claims seeking compensation for harms allegedly caused by greenhouse-gas emissions. The Court also directed the parties to address whether it has jurisdiction to hear the case. As of October 3, 2026, oral argument has not taken place and the Court has not ruled.
What is the Supreme Court climate change case about?
Boulder’s lawsuit is part of a dispute over whether local governments can use state law to seek compensation from fossil-fuel companies for climate-related costs. Boulder says it is pursuing damages for harm to the community and alleges that Suncor Energy and ExxonMobil deceived the public about their contributions to climate change. The companies and the federal government contend that claims tied to greenhouse-gas emissions intrude on an area that should be governed federally.
The Court’s central merits question is whether federal law preempts—that is, displaces—these state-law claims. It has also asked the parties to address a threshold issue: whether the Court has statutory and Article III jurisdiction to hear the case. That procedural question could be addressed before, or instead of, the merits.
Why is Boulder suing oil companies?
The City and County of Boulder filed suit against Suncor Energy and ExxonMobil in Colorado state court in 2018. The complaint alleges that the companies violated Colorado law by misleading the public about their role in climate change. Boulder seeks unspecified damages to help cover local costs it says are associated with worsening climate-related disasters.
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The parties characterize the purpose and effect of the lawsuit differently:
| Boulder’s position | Companies’ and federal government’s position |
|---|---|
| Boulder says it seeks compensation for costs in Colorado, not regulation of emissions elsewhere. Earthjustice senior vice president Sam Sankar told the Associated Press: “Boulder County and city aren’t trying to change what’s happening in Texas or New York, they’re trying to get compensation for things happening now in Colorado.” | The companies argue that state-court lawsuits are not an appropriate way to address a global problem. The federal government supports them, arguing that the claims indirectly seek to regulate greenhouse-gas emissions, a subject it says the Clean Air Act assigns to federal regulation. Federal government attorneys told the Associated Press: “No one state can superimpose its own regulatory preferences on the rest — least of all to address a global problem that exists almost entirely outside its borders and affects the world at large.” |
These are arguments by the parties, not findings by the Supreme Court. Manufacturers’ Accountability Project special counsel Phil Goldberg told the Associated Press: “The problem is that climate change is caused by pretty much everybody living on earth.”
What does the Marshall Fire have to do with the lawsuit?
The Marshall Fire happened in 2021, three years after Boulder filed its complaint. It did not prompt the original lawsuit, but it illustrates the kind of local disaster cost at the heart of the broader dispute. The Associated Press reported that climate change was considered a factor in the fire, which destroyed Tawnya Somauroo’s home. AP estimated total damage at $2 billion and described it as the costliest wildfire in Colorado history; that is an estimate, not a final audited loss figure.
Somauroo told AP: “We lost our homes and they left us to figure out for ourselves how to make our neighborhoods safe again.” AP reported that her rebuilt home has fire-resilient features, including careful landscaping, metal fencing and flame-resistant siding. Those details describe her experience; they do not establish that any one measure prevents wildfire loss.
Chris Winter, executive director of the Getches-Wilkinson Center, told AP: “Local county municipal governments play a very important role in helping front line communities adapt to climate change. This case could very well set a precedent.” The Supreme Court’s eventual ruling may affect how similar claims proceed, but its outcome and reach remain unresolved.
When will the Supreme Court hear the Boulder climate case?
The Court’s October 2026 argument calendar schedules one hour for the case on Monday, October 5. The official hearing list names Kannon K. Shanmugam for the petitioners, Kevin K. Russell for the respondents, and Sarah M. Harris, Principal Deputy Solicitor General, for the United States as amicus curiae. The Court granted review on February 23, 2026, after the Colorado Supreme Court decided the case on May 12, 2025. The Supreme Court docket and October hearing list provide the official case and schedule information.
The Associated Press reported that Justice Samuel Alito recused himself shortly before argument because he owns stock in oil companies. With eight justices participating, a tie is possible, but neither its likelihood nor the outcome should be assumed. AP also notes that the jurisdiction question offers the Court a procedural route that could avoid deciding the central preemption issue. The Court’s question presented sets out the questions it directed the parties to address.
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What happens next?
After argument, the Court will decide whether it has jurisdiction and how to resolve the federal-preemption issue if it reaches the merits. Until it issues a decision, there is no Supreme Court ruling on whether Boulder’s claims may proceed or what the case means for other climate-related lawsuits. The Associated Press’s report on the case and the Marshall Fire provides current reporting and the attributed statements quoted above.
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