Why may a person be responsible when a tree from their land falls onto a neighbor's property?

In the context of tort law, a landowner may be held responsible for a fallen tree that damages a neighbor's property primarily through the principles of negligence or nuisance.

Under negligence, a person is expected to meet a standard of behavior to protect others from unreasonable risk. If a landowner fails to exercise reasonable care—such as failing to maintain or remove a tree that they knew or should have known was diseased or hazardous—they may be liable for the resulting damage. The law assesses this by comparing the landowner's conduct to that of a hypothetical "reasonable person" in the same situation.1

Alternatively, the situation may be classified as a private nuisance if the tree creates a physical condition that interferes with a neighbor's use and enjoyment of their land. While a nuisance often involves intangible interference like noise or odors, an activity or condition that causes actual physical damage to neighboring property is generally actionable regardless of the neighborhood's character. In such cases, the affected neighbor may seek monetary damages for the loss suffered.2