US-CaliforniaWhat is assumption of risk and can it bar my injury claim?
Assumption of risk is a legal defense that can completely bar your injury claim in California if you voluntarily and knowingly accepted a known danger. It applies in both express (written or spoken) and implied (based on conduct) forms.
What the Law Says
California law recognizes assumption of risk as a complete defense to negligence claims — meaning if proven, it eliminates the defendant’s liability entirely. The doctrine operates in two main forms: primary (which eliminates duty) and secondary (which may reduce or bar recovery depending on comparative fault).
Primary assumption of risk applies when the defendant owes no legal duty to protect the plaintiff from certain inherent risks — for example, the risk of being hit by a ball at a baseball game or falling while skiing. In those situations, the law treats the risk as 'inherent' to the activity, and the defendant is not liable unless they act recklessly or increase the risk beyond what is inherent.
Secondary assumption of risk arises when the defendant does owe a duty, but the plaintiff knowingly and voluntarily encounters a risk created by the defendant’s negligence. Under California’s comparative fault system, this type of assumption of risk no longer acts as a complete bar — instead, it reduces recovery proportionally (e.g., if the plaintiff is 30% at fault for ignoring a wet-floor sign, their damages are reduced by 30%).
Statutory TextIn primary assumption of risk, the defendant owes no duty to protect the plaintiff from risks inherent in the activity.
— Knight v. Jewett, 3 Cal.4th 296, 314–315 (1992) — foundational case
Statutory TextSecondary assumption of risk is merged into the comparative fault scheme and operates as a form of contributory negligence.
— Li v. Yellow Cab Co., 13 Cal.3d 804, 829 (1975) — comparative fault adoption
What Courts Have Said
California courts have carefully distinguished between primary and secondary assumption of risk — with major implications for whether a claim survives.
Established the modern framework: primary assumption of risk eliminates duty for inherent risks in sports and recreation; defendants aren’t insurers of safety.
Extended primary assumption of risk beyond sports to recreational activities like water skiing — confirming that participants assume inherent risks of the activity.
Held that an employer does not owe a duty to protect employees from ordinary workplace hazards they are trained to recognize — applying primary assumption of risk in employment contexts.
What to Do
Determine whether your activity involved an 'inherent risk' (e.g., contact sport, skiing, rock climbing) — if so, primary assumption of risk may apply.
Gather evidence showing you were unaware of the specific danger, or that the defendant unreasonably increased the risk (e.g., defective equipment, hidden hazard, reckless conduct).
If the defendant owed a duty (e.g., property owner failing to fix a broken stair), focus on proving their negligence — secondary assumption of risk won’t fully bar your claim, but may reduce compensation.
Consult a California personal injury attorney early — assumption of risk defenses are fact-intensive and require prompt investigation.
Sources
Not legal advice. This article is general information based on publicly available sources, written for educational purposes. Laws change and individual situations vary. Consult a licensed attorney in your jurisdiction before acting on anything you read here. Last reviewed: 2026-06-08.