The discovery rule is a legal doctrine that prevents the statute of limitations in a personal injury case from starting until the injured person discovers, or reasonably should have discovered, the harm. It mainly applies to injuries that are not obvious right away, such as medical or toxic-exposure cases — not an ordinary accident, where the clock starts on the incident date.
The discovery rule is an exception that starts the statute-of-limitations clock not on the date of the injury, but on the date you discovered it — or reasonably should have discovered it. It applies to injuries that are hidden or delayed: a surgical instrument left behind, an illness from long-term chemical exposure, a slowly worsening condition traced back to a defective product. In those cases it would be unfair to start the clock before the person could have known they were harmed, so the law waits. The rule does not apply to obvious injuries — a car crash or a fall starts the clock that day. Even where it applies, many states pair it with a hard outer limit called a statute of repose, and whether you 'should have known' earlier is a legal judgment defendants routinely contest, so never assume the discovery rule buys you time without confirming.
What does the discovery rule do? It starts the statute-of-limitations clock when you discovered the injury, or reasonably should have, instead of on the date the injury occurred.
When does it apply? Mainly to injuries that aren't obvious right away — some medical, surgical, or toxic-exposure cases — where you couldn't reasonably have known you were harmed.
When does it not apply? To obvious injuries. In a car crash or a fall, the clock starts on the date of the accident; the discovery rule generally doesn't extend it.
Is there an outer limit? Often yes. Many states cap the discovery rule with a statute of repose — a hard deadline that can bar the claim regardless of when you discovered it.
Pick your state. Add the injury date and we'll estimate your filing deadline too.
Your state's standard deadline for a negligence-based personal injury claim. The exceptions below and the special rules on this page can change it.
| State | Deadline to file | Note |
|---|---|---|
| Alabama | 2 years | — |
| Alaska | 2 years | — |
| Arizona | 2 years | — |
| Arkansas | 3 years | — |
| California | 2 years | — |
| Colorado | 2 years | 3 yrs for motor-vehicle accidents |
| Connecticut | 2 years | — |
| Delaware | 2 years | — |
| District of Columbia | 3 years | — |
| Florida | 2 years | changed from 4 yrs in March 2023 |
| Georgia | 2 years | — |
| Hawaii | 2 years | — |
| Idaho | 2 years | — |
| Illinois | 2 years | — |
| Indiana | 2 years | — |
| Iowa | 2 years | — |
| Kansas | 2 years | — |
| Kentucky | 1 year | 2 yrs for motor-vehicle accidents |
| Louisiana | 2 years | extended from 1 yr, effective July 2024 |
| Maine | 6 years | — |
| Maryland | 3 years | — |
| Massachusetts | 3 years | — |
| Michigan | 3 years | — |
| Minnesota | 2 years | — |
| Mississippi | 3 years | — |
| Missouri | 5 years | — |
| Montana | 3 years | — |
| Nebraska | 4 years | — |
| Nevada | 2 years | — |
| New Hampshire | 3 years | — |
| New Jersey | 2 years | — |
| New Mexico | 3 years | — |
| New York | 3 years | — |
| North Carolina | 3 years | — |
| North Dakota | 6 years | — |
| Ohio | 2 years | — |
| Oklahoma | 2 years | — |
| Oregon | 2 years | — |
| Pennsylvania | 2 years | — |
| Rhode Island | 3 years | — |
| South Carolina | 3 years | — |
| South Dakota | 3 years | — |
| Tennessee | 1 year | — |
| Texas | 2 years | — |
| Utah | 4 years | — |
| Vermont | 3 years | — |
| Virginia | 2 years | — |
| Washington | 3 years | — |
| West Virginia | 2 years | — |
| Wisconsin | 3 years | — |
| Wyoming | 4 years | — |
Most injuries are obvious the moment they happen, and the clock starts that day. The discovery rule is the exception for injuries that stay hidden. Classic examples: a surgical sponge or instrument discovered months later, an illness from toxic or asbestos exposure that surfaces years after, or damage from a defective drug or product that isn't linked to its cause until much later. In these situations many states start the clock when you knew — or a reasonable person should have known — both that you were injured and that it may have resulted from someone's wrongdoing.
Two cautions keep the rule from being a blanket extension. First, the 'should have known' standard is objective: if the facts would have prompted a reasonable person to investigate, the clock can start then, even if you didn't actually connect the dots — and defendants argue this hard. Second, many states impose a statute of repose: an absolute outer deadline (measured from the act itself, not from discovery) that can bar a claim even if you discovered the harm too late. Because it's fact-specific and varies by state and claim type, treat the discovery rule as something to confirm with an attorney, not to rely on.
Any of these can move your real deadline away from the standard number.
Suing a city, county, state, or public hospital usually requires a formal written notice of claim first — often within 60 days to 1 year, far shorter than the standard deadline. Miss the notice and the claim can be barred even if years remain on the normal clock.
For injuries you couldn't reasonably have discovered at the time (some medical or toxic-exposure cases), the clock may start when you knew or should have known — not the date of the incident. It can extend your window, but don't count on it without legal advice.
When the injured person is under 18, the deadline is often paused (tolled) until they reach adulthood, so a child's claim can be filed years later. The rules vary by state and don't always apply to every claim type.
Wrongful-death claims typically run from the date of death, not the injury, and medical-malpractice claims often have their own deadline plus a hard outer limit (a statute of repose). Both can differ from the general number above.
A free, no-obligation review confirms your real deadline and whether your claim is worth pursuing — most attorneys will tell you in one short call, and it costs nothing to ask. Don't let the clock decide for you.
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→ How long do I have to file a personal injury claim? (deadline by state)
→ Does an insurance claim pause the statute of limitations?
→ What is the statute of limitations for personal injury?
→ When does the statute of limitations clock start?
→ Settlement statistics by injury type — compare an offer against real, cited cases.
→ Do I have a personal injury case? — a 60-second check.
It delays the start of the statute of limitations until you knew, or reasonably should have known, that you were injured. It applies mainly to injuries that aren't immediately obvious, such as some medical, surgical, or toxic-exposure cases, rather than an obvious accident.
To latent or delayed injuries you couldn't reasonably have discovered at the time — for example a retained surgical object, an illness from long-term exposure, or harm from a defective product discovered later.
Generally no. In an obvious accident like a car crash the injury is apparent, so the clock starts on the date of the accident and the discovery rule does not extend it.
Yes. Many states pair it with a statute of repose — an absolute outer deadline measured from the wrongful act — that can bar the claim even if you discovered the injury too late.
No. Whether you 'should have known' earlier is an objective legal judgment that defendants contest, so you should confirm with an attorney rather than assume the rule extends your deadline.
The state deadlines above are the general statute of limitations for a negligence-based personal injury claim, cross-referenced across multiple legal references and — because widely circulated charts are often out of date — checked against the primary statute where a state deviates or changed recently. Where sources disagreed we show the shorter deadline (the "safe-direction" rule).
Ky. Rev. Stat. § 413.140(1)(a) · Tennessee Tenn. Code § 28-3-104(a)Mo. Rev. Stat. § 516.120 (5) · Maine Me. Rev. Stat. tit. 14, § 752 (6) · North Dakota N.D. Cent. Code § 28-01-16 (6)Neb. Rev. Stat. § 25-207 · Utah Utah Code § 78B-2-307 · Wyoming Wyo. Stat. § 1-3-105Fla. Stat. § 95.11 (2023 HB 837) · Louisiana extended 1→2 years, effective July 1, 2024 La. Civ. Code art. 3493.1Colo. Rev. Stat. §§ 13-80-102, 13-80-101 · California Cal. Code Civ. Proc. § 335.1
Primary & authoritative references: Cornell Legal Information Institute — statute of limitations · Justia US state codes · California Legislative Information — Cal. Code Civ. Proc. § 335.1 · Nolo 50-state chart. For any specific claim, confirm the current deadline against your state's official code or a licensed attorney — statutes change and special claim types run on separate clocks.