A plaintiff with standing must also come to court at the right time. Too early, and the case is not ripe. Too late, and it is moot. Both doctrines keep courts deciding live, concrete disputes.
Key idea
A case is not ripe if the harm is too speculative or the dispute not yet concrete. A case is moot if events end the dispute, unless an exception applies, such as a wrong "capable of repetition, yet evading review" or a defendant's voluntary stop that it could resume.
Why it works
Ripeness keeps courts from deciding disputes that may never happen or whose facts are not yet known. In Abbott Laboratories v. Gardner (1967) the Court framed a two-part inquiry: the fitness of the issues for decision (is it a purely legal question, or does it need more facts?) and the hardship to the parties of waiting (must they change their conduct now or risk penalties?). A person need not break a law and be prosecuted to challenge it if the threat of enforcement is real.
Mootness is standing over time: the personal stake must last through the whole case. If the dispute ends (the plaintiff graduates, the law is repealed, the parties settle), the court dismisses. Exceptions keep important questions reviewable: some wrongs are too short to finish litigating but likely to recur to the same person (capable of repetition, yet evading review); a defendant cannot moot a case just by stopping, unless it is absolutely clear the conduct could not reasonably be expected to recur (voluntary cessation, as in Friends of the Earth v. Laidlaw, 2000); and a criminal conviction with lasting collateral consequences can be challenged after the sentence ends.
Mootness is standing over time: the personal stake must last through the whole case. If the dispute ends (the plaintiff graduates, the law is repealed, the parties settle), the court dismisses. Exceptions keep important questions reviewable: some wrongs are too short to finish litigating but likely to recur to the same person (capable of repetition, yet evading review); a defendant cannot moot a case just by stopping, unless it is absolutely clear the conduct could not reasonably be expected to recur (voluntary cessation, as in Friends of the Earth v. Laidlaw, 2000); and a criminal conviction with lasting collateral consequences can be challenged after the sentence ends.
Worked example: Too early?
A state agency is considering a rule that might someday require labs to change their reporting forms. No rule has been proposed. A lab sues to block it. Ripe?
- Fitness: no rule text exists, so the court cannot know what it would require.
- Hardship: the lab need not change anything now.
Answer: Not ripe.
Worked example: Too late?
A student sues to stop his school from enforcing a dress-code rule against him. Before the appeal is decided, he graduates. Moot? Any exception?
- He no longer attends the school, so the rule can't affect him: the dispute has ended for him.
- Capable of repetition? Not to him: he has graduated.
- Voluntary cessation? The school did not stop; the student left.
Answer: Moot (unless the suit was a class action or he seeks damages for past harm).
Common mistake
Mixing up the two by timing. Ripeness asks "too early?" (has the dispute become concrete?); mootness asks "too late?" (is the dispute still alive?). Check: is the event that would create the injury still in the future (ripeness) or has the dispute already ended (mootness)?
This is an educational course, not legal advice.