The attractive nuisance doctrine is a premises liability theory—a legal basis on which the owner or operator of real property (premises) may be liable for personal injuries suffered by a child who trespasses on the premises and is injured by an object that attracted the child onto the premises—such as a swimming pool; a playground slide; a trampoline; piles of wood or sand; or abandoned machinery, equipment, or motor vehicles.

The only duty a premises owner or occupier owes a trespasser is not to injure him willfully, wantonly, or through gross negligence. But as to invitees, a premises owner or occupier must use ordinary care to reduce or eliminate an unreasonable risk of harm created by a premises condition of which the owner is or reasonably should be aware.

But when children of tender years come upon the premises by virtue of their unusual attractiveness, the legal effect is that of an implied invitation to do so. Such child is regarded, not as a trespasser, but as being rightfully on the premises. This is the doctrine of attractive nuisance. It originally developed in so-called “turntable cases” where young children were injured playing on railroad turntables which seemed especially attractive playgrounds, the dangers of which children did not appreciate.

Thus, a possessor of land is subject to liability for physical harm to children trespassing thereon caused by an artificial condition upon the land if:

• the place where the condition exists is one upon which the possessor knows or has reason to know that children are likely to trespass, and

• the condition is one of which the possessor knows or has reason to know and which he realizes or should realize will involve an unreasonable risk of death or serious bodily harm to such children, and

• the children because of their youth do not discover the condition or realize the risk involved in intermeddling with it or in coming within the area made dangerous by it, and

• the utility to the possessor of maintaining the condition and the burden of eliminating the danger are slight as compared with the risk to children involved, and

• the possessor fails to exercise reasonable care to eliminate the danger or otherwise to protect the children.

Laws vary from state to state and not all states recognize the attractive nuisance doctrine. In states that do recognize the attractive nuisance doctrine, the law may be located in the state’s court opinions—also known as the common law or case law—or in the state’s statutes.

In New Hampshire, the attractive nuisance doctrine is a legal principle that can hold property owners liable for injuries to children who trespass on their property due to a hazardous condition that is likely to attract children. This doctrine recognizes that children may not appreciate the risks associated with certain conditions, such as swimming pools, playground equipment, or abandoned machinery. Under New Hampshire law, a property owner may be liable if they know or should know that children are likely to trespass, the condition poses an unreasonable risk of serious harm, the children do not recognize the danger, the burden of remedying the situation is minor compared to the risk, and the property owner fails to take reasonable steps to secure the hazard or protect the children. This doctrine is part of the state's common law, derived from court decisions rather than specific statutes. It modifies the general rule that property owners owe a limited duty to trespassers, elevating the duty of care owed to child trespassers in certain situations.