Yes No Share to Facebook
Reasonable Foreseeability:
Principles Regarding Whether an Advance Risk of Harm Arising Could Be Recognized
Last Updated: March 26 2026
Question: What does “reasonable foreseeability” mean in Ontario negligence law?
Answer: In Ontario negligence cases, “reasonable foreseeability” is an objective test asking whether a reasonable person in the defendant’s position should have anticipated a real risk of the type of harm before the incident occurred, without relying on hindsight, as discussed in Rankin (Rankin’s Garage & Sales) v. J.J., [2018] 1 S.C.R. 587 and Mustapha v. Culligan of Canada Ltd., [2008] 2 S.C.R. 114. Access Ontario Legal Services provides paralegal services in Ontario, helping clients apply foreseeability and remoteness principles to assess liability and build clear, evidence-based arguments for their legal matter.
Understanding Foreseeability Principles
Negligence law includes the principle of reasonable foreseeability. Reasonable foreseeability involves the question of whether a reasonable person could envision the risk of harm arising from the specific conduct in question. As a fundamental component of negligence law principles requires an analysis of what a reasonable person would do or avoid doing, analyzing what a reasonable person would view as risky becomes necessary within a negligence liability discussion.
The Law
Within the Rankin (Rankin’s Garage & Sales) v. J.J., [2018] 1 S.C.R. 587, and Mustapha v. Culligan of Canada Ltd., [2008] 2 S.C.R. 114, cases, the Supreme Court explained the concept of reasonable foreseeability whereas it was said:
[53] Whether or not something is “reasonably foreseeable” is an objective test. The analysis is focussed on whether someone in the defendant’s position ought reasonably to have foreseen the harm rather than whether the specific defendant did. Courts should be vigilant in ensuring that the analysis is not clouded by the fact that the event in question actually did occur. The question is properly focussed on whether foreseeability was present prior to the incident occurring and not with the aid of 20/20 hindsight: L. N. Klar and C.S.G. Jefferies, Tort Law (6th ed. 2017), at p. 212.
[12] The remoteness inquiry asks whether “the harm [is] too unrelated to the wrongful conduct to hold the defendant fairly liable” (Linden and Feldthusen, at p. 360). Since The Wagon Mound (No. 1), the principle has been that “it is the foresight of the reasonable man which alone can determine responsibility” (Overseas Tankship (U.K.) Ltd. v. Morts Dock & Engineering Co., [1961] A.C. 388 (P.C.), at p. 424).
[13] Much has been written on how probable or likely a harm needs to be in order to be considered reasonably foreseeable. The parties raise the question of whether a reasonably foreseeable harm is one whose occurrence is probable or merely possible. In my view, these terms are misleading. Any harm which has actually occurred is “possible”; it is therefore clear that possibility alone does not provide a meaningful standard for the application of reasonable foreseeability. The degree of probability that would satisfy the reasonable foreseeability requirement was described in The Wagon Mound (No. 2) as a “real risk”, i.e. “one which would occur to the mind of a reasonable man in the position of the defendan[t] . . . and which he would not brush aside as far-fetched” (Overseas Tankship (U.K.) Ltd. v. Miller Steamship Co. Pty., [1967] A.C. 617 (P.C.), at p. 643).
[14] The remoteness inquiry depends not only upon the degree of probability required to meet the reasonable foreseeability requirement, but also upon whether or not the plaintiff is considered objectively or subjectively. One of the questions that arose in this case was whether, in judging whether the personal injury was foreseeable, one looks at a person of “ordinary fortitude” or at a particular plaintiff with his or her particular vulnerabilities. This question may be acute in claims for mental injury, since there is a wide variation in how particular people respond to particular stressors. The law has consistently held — albeit within the duty of care analysis — that the question is what a person of ordinary fortitude would suffer: see White v. Chief Constable of South Yorkshire Police, [1998] 3 W.L.R. 1509 (H.L.); Devji v. Burnaby (District) (1999), 180 D.L.R. (4th) 205, 1999 BCCA 599; Vanek. As stated in White, at p. 1512: “The law expects reasonable fortitude and robustness of its citizens and will not impose liability for the exceptional frailty of certain individuals.”
As explained in Rankin and Mustapha, foreseeability involves whether a person of similar intellectual fortitude could reasonably anticipate that certain conduct could result in the occurrence of harm to another person. Additionally, per Rankin and Mustapha, when reviewing whether harm was foreseeable a court must consider the incident from the perspective of foresight rather than in hindsight.
Conclusion
Negligence law involves the review of whether a person acted carelessly and should be held liable for harm caused through such carelessness to another person. As part of the question of whether conduct was careless, the question arises as to whether the resulting harm was foreseeable. If the harm was reasonably unforeseeable, then liability for the harm fails to arise.
NOTE: A significant number of online searches for “lawyers near me” or “best lawyer in” frequently indicate a desire for prompt and competent legal assistance rather than a specific job title. In Ontario, licensed paralegals are governed by the same Law Society that manages lawyers and have the authority to represent clients in specific litigation matters. Skills in advocacy, legal analysis, and procedural expertise are essential to this function. Access Ontario Legal Services provides legal representation within its licensed boundaries, focusing on strategic positioning, evidence preparation, and persuasive advocacy to secure efficient and favourable results for clients.