The limitation period is not a procedural technicality. It is a hard legal wall that permanently extinguishes your right to sue once it passes. Understanding when it starts, how it is calculated, and what limited exceptions exist is essential for anyone who has been injured in Ontario.
The Basic Rule: Two Years From Discovery
Ontario’s Limitations Act, 2002 establishes the general limitation period for personal injury claims at two years. The clock begins not necessarily on the date of the accident, but on the date the claim was “discovered” — defined as the date you first knew, or ought reasonably to have known, that:
- An injury occurred
- The injury was caused by an act or omission of another person
- That person could be identified
- A legal proceeding would be an appropriate response to the situation
In straightforward cases — a car accident with obvious injuries and a clearly identified at-fault driver — the discovery date is typically the date of the accident itself. The two-year clock starts that day.
In more complex cases — delayed injury presentation, latent conditions, or situations where the identity of the at-fault party was not initially clear — the clock may start later than the accident date.
The Discovery Rule: When Did You Really Know?
The discovery rule is the most important nuance in Ontario limitation period analysis. It means the two-year clock starts when you knew or ought to have known the elements listed above — not necessarily when the harm occurred.
Practical examples where the discovery rule may delay the start of the limitation period:
- Delayed injury presentation: Some injuries — particularly brain injuries, internal injuries, and certain psychological conditions — do not become apparent immediately after an accident. If you did not know you were injured at the time of the accident, the limitation period may begin later.
- Unknown causation: If you developed a condition that you did not initially connect to the accident, the clock may start when the connection was or should have been discovered.
- Medical malpractice: Where the negligence that caused harm was not immediately apparent — such as a missed diagnosis or a surgical error discovered years later — the discovery rule has significant application.
The “ought reasonably to have known” standard is objective. You cannot delay indefinitely by claiming subjective ignorance of your rights. If the facts were available and a reasonable person in your position would have connected them to potential liability, the clock starts running whether or not you actually made that connection.
Exceptions: When the Limitation Period Does Not Start Immediately
Minors
If the injured person was under 18 years of age at the time of the injury, the two-year limitation period does not begin until they turn 18. A child injured at age 10 has until age 20 to commence a claim. This protection exists regardless of whether the child has a parent or guardian who could have commenced a claim on their behalf earlier.
Persons With Legal Incapacity
If the injured person was legally incapacitated at the time of the accident — unconscious, severely cognitively impaired, or otherwise unable to manage their legal affairs — the limitation period does not run during the period of incapacity.
Municipal Notice Periods
Claims involving municipal property have their own overlay of notice requirements that operate separately from the limitation period. A pedestrian injured on a city sidewalk must provide written notice to the municipality within 10 days. A slip and fall victim on ice or snow must provide notice within 60 days. These notice deadlines are shorter than — and independent of — the two-year limitation period. Missing a notice period may bar the claim even if the limitation period has not expired.
Why Acting Early Matters Beyond the Deadline
The two-year limitation period is a minimum requirement, not an optimal strategy. Waiting until close to the deadline to start your claim creates serious practical problems:
Evidence disappears. Dashcam footage is overwritten within 72 hours. Surveillance camera footage from nearby businesses cycles within days. Witness memories fade. Accident scene conditions change. The evidence that makes the difference between a strong claim and an unwinnable one is often only available in the days and weeks immediately following the accident.
Medical records become contested. When there is a significant gap between an accident and medical treatment, insurers argue the injuries either did not occur or were caused by something else. Continuous treatment records from the date of injury forward are far more persuasive than records that begin months later.
Limitation periods for notice requirements are shorter. As noted above, municipal notice requirements (10 days or 60 days) are significantly shorter than the two-year limitation period. Waiting even a few weeks may eliminate claims against municipalities while the general limitation period is still running.
How Cambria Law Can Help
If you have been injured in Ontario and are unsure whether the limitation period has passed — or approaching — call us immediately. We can assess the specific facts of your situation, identify the applicable discovery date, and advise whether any exceptions apply.
Claims where the deadline is close require urgent action. Do not assume it is too late without speaking to a lawyer first.
