Weyerhaeuser Co. v. United States Fish and Wildlife Serv.
The Supreme Court ruled that land can only be designated "critical habitat" for an endangered species under the Endangered Species Act if it actually qualifies as habitat for that species in the first place, sending the dusky gopher frog case back for the lower court to decide what "habitat" means and whether a Louisiana timber tract qualifies.
The Court also held that a wildlife agency's decision not to exempt land from a critical-habitat designation can be challenged in court, rejecting the government's argument that such decisions are entirely discretionary and unreviewable.
How it got here: A federal trial court upheld the designation and declined to review the exclusion decision; the Fifth Circuit affirmed both rulings, and the landowners asked the Supreme Court to review.
The Case in Depth
What happened
A timber company and family landowners owned a 1,544-acre tract in Louisiana, called Unit 1, that once hosted dusky gopher frogs but had been converted into a closed-canopy timber plantation where no frog had been seen since 1965. The Fish and Wildlife Service designated Unit 1 as critical habitat anyway, reasoning its rare breeding ponds made it essential to the frog's survival, despite estimates that the designation could cost the owners up to $33.9 million in lost development value.
The question before the Court
Can land where an endangered frog can't currently survive still be labeled its "critical habitat," and can courts review a wildlife agency's choice not to exempt that land from the designation?
The Court's answer
Partly — the Court didn't decide whether the Louisiana tract actually counts as the frog's habitat, but it did settle two legal ground rules. First, land can only be labeled "critical habitat" under the Endangered Species Act if it qualifies as "habitat" for the species at all; the government can't skip that threshold question. The Fifth Circuit had never addressed what "habitat" means, so the Court sent that question back for the lower court to answer, along with whether this particular tract meets the definition.
Second, yes — a court can review an agency's decision not to exempt land from a critical-habitat designation for economic reasons. The Court rejected the government's claim that this decision is entirely unreviewable, holding that the statute gives courts a meaningful standard to check whether the agency properly weighed costs and benefits.
Curious how the Court got there? See the step-by-step legal reasoning →
Why it matters
Landowners whose property is swept into critical-habitat designations gain two tools: a threshold argument that unusable land isn't "habitat" at all, and a guaranteed right to challenge an agency's refusal to exempt their land for economic reasons. This could reshape how the Fish and Wildlife Service designates habitat nationwide and gives property owners more leverage in future disputes.
What changes now
The case returns to the Fifth Circuit, which must now decide what "habitat" means under the Endangered Species Act, whether Unit 1 actually qualifies as habitat for the dusky gopher frog, and whether the agency's decision not to exempt Unit 1 from the designation was arbitrary or an abuse of discretion. This is a final ruling on the legal questions presented, but the ultimate fate of Unit 1's designation remains undecided pending further proceedings.
What this does not decide
The Court did not decide whether Unit 1 actually qualifies as habitat for the dusky gopher frog, what the legal definition of "habitat" should be, or whether the agency's cost-benefit analysis was actually flawed. Those questions go back to the Fifth Circuit to resolve first.
How the Court got there
The legal reasoning, step by step
- The Court began with the ordinary meaning of the phrase "critical habitat": since adjectives narrow a category, "critical habitat" must be a subset of a broader category called "habitat," meaning land cannot be critical habitat unless it is habitat at all.
- Turning to the statute's actual authorization clause (not just its definitions section), the Court found that the Endangered Species Act only lets the government designate "habitat" as critical, and the definitional section describing what makes habitat "critical" does not independently define "habitat" itself.
- Because the lower appeals court had assumed no such habitat requirement existed and never interpreted what "habitat" means or examined whether Unit 1 met that definition, the Supreme Court left those factual and legal questions for the appeals court to resolve first.
- On the second question, the Court applied the Administrative Procedure Act's presumption that agency actions are reviewable in court, which can only be overcome in rare cases where a law gives courts no meaningful standard to judge an agency's discretion.
- The Court read the statute's cost-consideration requirement and its exclusion authority as one connected process, meaning a court can measure whether the agency actually weighed the required costs and benefits properly, providing exactly the kind of meaningful standard needed for judicial review.
- Because a meaningful standard existed, the agency's decision not to exempt Unit 1 was reviewable for abuse of discretion, and the Court left it to the appeals court to decide in the first instance whether the agency's cost-benefit analysis was flawed.
Doctrinal impact
Cases affected by this decision
Reaffirms Bennett v. Spear (520 U. S. 154)
The Court relied on this case's view that the Secretary's exclusion decision is reviewable for abuse of discretion.
Distinguishes Lincoln v. Vigil (508 U. S. 182)
The Court said this case's narrow unreviewability exception does not apply to the Endangered Species Act provision here.