No. 25-170October Term 2025Before Arguments
Suncor Energy (U.S.A.) Inc. v. County Commissioners of Boulder County
from the Supreme Court of Colorado.
Case status
- Current stage
- Before Arguments
- Latest event
- Accepted by the Court
- Decision timing
- No window until argument is scheduled.
- What it's about
from the Supreme Court of Colorado.
Question presented
1. Whether federal law precludes state-law claims seeking relief for injuries allegedly caused by the effects of interstate and international greenhouse-gas emissions on the global climate. 2. Whether this Court has statutory and Article III jurisdiction to hear this case.
- Case path
Supreme Court of Colorado / Accepted by the Court
- Area
Supreme Court case awaiting argument
Timing
Expected by late June 2026, if argued this term
The Court granted review but has not yet scheduled oral argument. Once argued, the median case reaches a decision in 94 days. Nearly all cases are decided by the end of the term in which they are argued.
Briefing
What it's about
The Supreme Court agreed to hear a fight over a Colorado state-law climate lawsuit involving energy companies. The justices will consider whether federal law blocks claims seeking relief for harms allegedly caused by interstate and international greenhouse-gas emissions, and whether the Court has statutory and Article III jurisdiction to hear the case.
Argument
The Court granted certiorari (agreed to hear the case), but oral argument has not been scheduled. The justices have not yet publicly weighed in on the merits in this case.
Impact
The answer could affect local governments like Boulder County that want to use state-law claims to address alleged climate harms, and companies sued in those cases. It also could shape whether similar disputes are treated mainly as state-law or federal-law fights.
What is at stake in Suncor Energy v. Boulder County?
The Court will decide whether federal law blocks this Colorado state-law climate suit. It also will examine whether it has jurisdiction to hear the case.
Who could be affected if federal law precludes these claims?
Local governments like Boulder County and energy companies could be directly affected. The answer could shape similar climate cases built on state law.
When is the next step in Suncor Energy v. Boulder County?
Watch for oral argument or another scheduling move from the Court. No argument date or decision window is available yet.
Related cases
Grounding
- Grounding
- Primary materials plus reporting.
- Note
- Best-effort analysis: this explainer relies on a mix of primary materials and trusted secondary sources. Official filings and opinions remain authoritative.
- Checked
- Jul 27, 2026
- Method
- Methodology