PERSONAL INJURY | 2026-09-29
California’s Delayed Discovery Rule: When the Statute of Limitations Clock Really Starts
A claim can be barred before you even know you were harmed — unless the delayed discovery rule applies. It postpones the limitations clock until you discovered, or should have discovered, your injury and its cause.
Statutes of limitations normally start running when the wrongful act occurs — but some injuries are not discovered until much later. California’s delayed discovery rule addresses this by postponing the start of the limitations period until the plaintiff discovered, or through reasonable diligence sh
The most valuable claim is worthless if it is filed too late. But California law recognizes that some harms are hidden — and the delayed discovery rule can move the starting line. This guide explains when the limitations clock actually begins under California law.
The General Rule of Accrual
A cause of action generally accrues, and the statute of limitations begins to run, when the wrongful act occurs and causes harm — in most personal injury cases, when the injury happens. If a plaintiff files after the limitations period (two years for most personal injury claims) runs from accrual, the claim is time-barred. The delayed discovery rule is the principal exception.
The Delayed Discovery Rule
Under the delayed discovery rule, accrual is postponed until the plaintiff discovers, or has reason to discover, the cause of action — that is, until the plaintiff is on inquiry notice that they have been wronged. The California Supreme Court’s decision in Fox v. Ethicon Endo-Surgery framed the standard: a plaintiff discovers a cause of action when they have reason at least to suspect a factual basis for its elements — suspicion of wrongdoing, coupled with knowledge of the harm and its cause. The plaintiff need not know the specific legal theory or the identity of every defendant; suspicion of a wrongful cause is enough to start the clock.
Reasonable Diligence — the Limit on the Rule
The rule protects only the reasonably diligent. Once a plaintiff has reason to suspect that they were harmed by wrongdoing, they are charged with a duty to investigate, and the limitations period runs from that point — not from when the investigation is complete. A plaintiff who ignores obvious warning signs cannot rely on the rule. This is why the analysis focuses on what the plaintiff knew or should have known, and when.
What the Plaintiff Must Plead
A plaintiff who relies on delayed discovery to avoid a limitations bar generally must plead specific facts showing (1) the time and manner of discovery, and (2) the inability to have discovered earlier despite reasonable diligence. Conclusory allegations are not enough; the complaint must affirmatively show why the claim is timely under the rule.
Related Doctrines
The delayed discovery rule is related to, but distinct from, other tolling and accrual doctrines — including fraudulent concealment (which tolls limitations where the defendant hid the claim), tolling for minors and the incapacitated, and specialized accrual rules in areas like medical malpractice and latent-defect cases. Which doctrine applies depends on the facts and the type of claim.
Frequently Asked Questions
When does the statute of limitations start in California?
Generally when the cause of action accrues (usually when the injury occurs), unless the delayed discovery rule postpones accrual until you discovered or should have discovered the injury and its wrongful cause.
What is inquiry notice?
Having reason to suspect a factual basis for a claim — suspicion of wrongdoing plus knowledge of harm and its cause. Under Fox v. Ethicon, that starts the clock and triggers a duty to investigate.
Do I have to know exactly who is liable?
No. Suspicion of a wrongful cause is enough; you need not know the precise legal theory or every defendant’s identity to start the limitations period.
What must I plead to use the rule?
Specific facts showing when and how you discovered the claim and why you could not have discovered it earlier with reasonable diligence.
Related Personal Injury Guides
Talk to a California Personal Injury Attorney
If you fear your claim may be too late — or a defendant argues it is — the delayed discovery rule may control when the clock started. Trembach Law Firm evaluates California limitations issues. Call (818) 514-7680.
Contact Trembach Law Firm at (818) 514-7680 for a confidential consultation.
Trembach Law Firm | 27001 Agoura Road, Suite 350, Calabasas, CA 91301