The plaintiff Emanuel Papadopoulos was injured when he slipped and fell on a patch of ice in the parking lot of the Liberty Tree Mall in Danvers in front of a Target department store.
4
He filed suit in the Superior Court against the defendants Target Corporation, which controlled the area of the parking lot where the plaintiff fell, and Weiss Landscaping Company, Inc., the contractor retained to remove snow and ice from the parking area. The judge allowed the defendants’ motions for summary judgment as to all claims.
5
The plaintiff appealed and, in an unpublished memorandum and order pursuant to its rule 1:28, the Appeals Court affirmed.
Papadopoulos
v.
Target Corp.,
1. The summary judgment decision. Based on the undisputed facts in the summary judgment record, at some time around 11 a.m. on December 20, 2002, the plaintiff drove to the Liberty Tree Mall in Danvers to shop at the Target department store. The temperature was below freezing, but it was not snowing or raining. The parking lot outside the store had been plowed and was essentially clear, although the plaintiff did notice scattered snow and some areas of ice. The plaintiff parked his automobile *370 in a “handicapped space” close to the store entrance and immediately beside a raised median strip that separated the parking area from the traffic lane running between the lot and the store. In clearing the lot, the snowplow had deposited a pile of snow on the median, but in doing so, the plow left some remaining snow on the ground by the edge of the median. The plaintiff left his automobile, entered the store, and made a purchase. As he proceeded toward his automobile after leaving the store, he slipped on a piece of ice that had frozen to the pavement. The ice on which the plaintiff tripped either had fallen from the snow piled on the median or had formed when snow melted and ran off the pile and then refroze to the pavement of the parking lot.
The judge concluded that, whether it was a chunk of ice that had fallen from the median or a patch of refrozen runoff from the snow pile, the ice that caused the plaintiff’s fall was a “natural accumulation.” Because our existing case law holds that a property owner does not violate the duty of reasonable care by failing to remove natural accumulations of snow and ice, see
Sullivan
v.
Brookline,
2. Discussion. The rule that a property owner is not liable in tort for failing to remove a natural accumulation of snow and ice has come to be known in the treatises and the courts of other jurisdictions as the “Massachusetts rule.” 7 We now revisit this rule. To do so requires a brief review of traditional common-law rules that governed the tort liability of property owners in the Nineteenth Century and approximately the first two-thirds of the Twentieth Century, because the natural accumulation rule derived from, and is a relic of, that earlier case law.
During this time period, the standard of liability of a property owner for injuries suffered on his property depended on the
*371
status of the plaintiff, that is, whether the plaintiff was a tenant, an invitee, a licensee, or a trespasser. See
Young
v.
Garwacki,
“[The landlord] is liable for obstructions negligently caused by him, but not for not removing obstructions arising from natural causes, or the acts of other persons, and not constituting a defect in the passageway itself. He would be liable for negligently leaving a coal scuttle in a dangerous position, but not for not removing one so placed by another person.”
Id.
If the plaintiff was an invitee, defined as a person invited onto the property by the property owner for the
property owner’s
benefit, see
Mounsey, supra
at 695-697, the property owner owed a duty to use reasonable care to keep the premises “in a reasonably safe condition in view of all the circumstances, including the likelihood of injury to others, the seriousness of the injury, and
*372
the burden of avoiding the risk.”
Id.
at 708, quoting
Smith
v.
Ar-baugh’s Restaurant, Inc.,
If the plaintiff was a licensee, defined as a person who entered onto the landowner’s property for the
licensee’s
“own convenience and pleasure,”
Mounsey, supra
at 697, quoting
Sweeny
v.
Old Colony & Newport R.R.,
If the plaintiff was a trespasser, the property owner’s only duty was to refrain from wanton and wilful misconduct.
Soule
v.
Massachusetts Elec. Co.,
During a period of “reconsideration and reform” between 1973 and 1980, this court abandoned what it characterized as the “obsolete machinery of the common law,”
Young
v.
Garwacki, supra
at 166, as it applied to premises liability, eradicated most of these differences in the standard of liability based on the status of the plaintiff, and applied the standard of reasonable care previously applied only to invitees to all but adult trespassers. See
id.
at 166-169;
Soule
v.
Massachusetts Elec. Co., supra
at 184 (applying reasonable care standard to child trespassers);
King
v.
G & M Realty Corp.,
Many commentators and out-of-State courts declare, although we have not done so, that the Massachusetts rule that property owners owe no duty to remove natural accumulations of snow *373 and ice originated with this court’s 1883 decision in Woods, supra. See note 7, supra. In the Woods case, a tenant brought suit against her landlord for injuries she sustained when she fell on a set of ice-covered granite steps located in a common passageway in the yard of the tenement house she occupied. Id. at 358-359. This court affirmed the trial judge’s order directing a verdict in favor of the defendant. Id. at 361. As discussed earlier, under the landlord-tenant law that prevailed at that time, a landlord could be held liable only for failing to exercise reasonable care to prevent the common area from becoming less safe than it had been when the tenant first entered into the lease, or for negligently placing a dangerous obstruction in the common area. Where the obstruction was snow or ice on stairs or a walkway, a landlord could be held liable to the tenant only if he placed the snow or ice there, or was otherwise responsible for it being there, which he would not be if the snow and ice were a natural accumulation. Therefore, in declaring that the landlord in Woods had no duty to the plaintiff “to remove from the steps the ice and snow which naturally accumulated thereon,” id., the court simply applied the general legal principle prevailing at the time that a landlord was not responsible to remove an obstruction he did not cause or create. 8
In
Watkins
v.
Goodall,
This legal distinction between “natural” and “artificial” accumulations of snow and ice, because it was used to determine whether the landlord had placed a dangerous obstruction in a common area, was limited to slip and fall claims brought by tenants, and did not apply to slip and fall claims brought by invitees, such as employees of a business, because a property owner owed a duty of reasonable care to invitees. In
Urquhart
v.
Smith & Anthony Co.,
Our case law in premises liability claims involving snow and
*375
ice for many years proceeded on two separate legal tracks, with tenants entitled to relief only where the landlord was negligent in depositing or otherwise causing hazards or obstructions of artificial snow or ice on a passageway within the common area of the premises, and invitees entitled to relief where the property owner acted unreasonably in failing to keep the walkway on the property in a safe condition. Compare
Karp
v.
Boott Mills,
In 1977, in
King
v.
G & M Realty Corp.,
The court also declared, however, that landowners are liable only for injuries caused by defects existing on their property and that “the law does not regard the natural accumulation of snow and ice as an actionable property defect, if it regards such weather conditions as a defect at all.” Id. at 79. There was no *377 evidence, the court said in affirming the judgment, that the defendants had “created a defective condition on their property” (emphasis added). Id. at 81. In this manner, a relic of abandoned landlord-tenant law was resurrected as an exception to the governing standard of reasonable care. The court then limited .this harsh standard by stating: “To be sure, in circumstances where some act or failure to act has changed the condition of naturally accumulated snow and ice, and the elements alone or in connection with the land become a hazard to lawful visitors, then a defect may exist, creating liability in the owner or occupier.” Id. at 80 n.3. 13 The court therefore created in Aylward, for the first time in our jurisprudence, a standard of liability specific to slips and falls on snow or ice that depended on a fact finder’s determination whether the snow or ice was a natural or unnatural accumulation.
Two years later, in
Sullivan
v.
Brookline,
Like the long-standing distinctions among tenants, licensees, and invitees now discarded, the reliance on a distinction between natural and unnatural accumulation has sown confusion and
*378
conflict in our case law. We now discard the distinction between natural and unnatural accumulations of snow and ice, which had constituted an exception to the general rule of premises liability that a property owner owes a duty to all lawful visitors to use reasonable care to maintain its property in a reasonably safe condition in view of all the circumstances. See
Mounsey, supra
at 708. “Complexity can be borne and confusion remedied where the underlying principles governing liability are based upon proper considerations, but the . . . distinction and the specious guidelines it generates obscure rather than illuminate the relevant factors which should govern determinations of the question of duty.”
14
Id.
at 706, quoting
Rowland
v.
Christian,
Determining liability for a slip and fall injury based on whether the plaintiff fell on a natural rather than an unnatural accumulation of snow or ice is not “based upon proper considerations.” The only rationale the decisions of this court have offered in support of this rule is that a property owner owes a duty to repair or warn of defects on the property, and a natural accumulation of snow or ice is not a defect.
Sullivan
v.
Brookline, supra
at 827, quoting
Aylward, supra
at 79. Implicit in this rationale is that a dangerous condition on one’s property can be a defect only if it is created or caused by the property owner. We do not accept this rationale where a property owner knows or has reason to know that a banana peel has been left on a floor by a careless customer; we have long held that the property owner has a duty to keep the property reasonably safe for lawful visitors regardless of the source of the danger. See
Anjou
v.
Boston Elevated Ry.,
Nor do we find the two justifications for the natural accumulation rule offered by contemporary authorities persuasive. First,
*379
it is suggested that the rule reflects a judgment that hazards created by accumulations of snow and ice are in general equally open and obvious to a visitor as to a property owner, and that a property owner owes no duty because a visitor charged with such knowledge can be counted on to look after his or her own safety. See 2 N.J. Landau & E.C. Martin, Premises Liability Law and Practice § 8A.04[2][c], at 8A-120 — 8A-122 (2010), and cases cited. The open and obvious doctrine provides that a property owner has no duty to warn of an open and obvious danger, because the warning would be superfluous for an ordinarily intelligent plaintiff.
O’Sullivan
v.
Shaw,
The second justification offered for the natural accumulation rule is that enforcement of an affirmative obligation to remove natural accumulations of snow and ice would be impractical, if not impossible, given the nature of the winter climate in the Commonwealth. See 2 N.J. Landau & E.C. Martin, Premises Liability Law and Practice, supra, and cases cited. See also Aylward, supra at 80-81. This argument has proven unpersuasive to every other Supreme Court in New England, which have all rejected the so-called Massachusetts rule of natural accumulation. 15 , 16 The Supreme Court of Rhode Island cogently defeated this argument by stating:
“We believe that today a landlord, armed with an ample supply of salt, sand, scrapers, shovels and even perhaps a snow blower, can acquit himself quite admirably as he takes to the common passageways to do battle with the fallen snow, the sun-melted snow now turned to ice, or the frozen rain. We fail to see the rationale for a rule which grants a seasonal exemption from liability to a landlord because he has failed to take adequate precautions against the hazards that can arise from the presence of unshoveled snow or unsanded or salt-free ice found in the areas of his responsibility but yet hold him liable on a year round basis for other types of defects attributable to the workings of mother nature in the very same portions of his property.”
Fuller
v.
Housing Auth. of Providence,
Perhaps because the distinction between natural and unnatural accumulations was not based on “proper considerations,” the
*381
“distinction and the specious guidelines it generates obscure rather than illuminate the relevant factors which should govern determination of the question of duty.” See
Mounsey, supra
at 706. The distinction forces judges and juries to focus not on whether the property owner acted reasonably to keep the property safe, but on whether the accumulation of snow and ice was natural or unnatural, which depends on whether the property owner, by its act or failure to act, changed the condition of the naturally accumulated snow and ice so that the unnatural accumulation, either alone or in connection with some other defect on the property, became a hazard to lawful visitors. See
Sullivan
v.
Brookline,
The difficulties of applying the distinction were not diminished where a property owner undertook efforts at removal. In
Sullivan
v.
Brookline, supra
at 827-828, the court reversed a jury verdict for a plaintiff injured by slipping on an icy entrance ramp to a municipal building because, while the evidence showed that town employees had shovelled snow from the ramp to expose an underlying layer of ice, the court held there was no evidence that the shovelling had actually
created
the ice on the ramp. “Liability does not attach . . . when a property owner
*382
removes a portion of an accumulation of snow or ice and a person is injured by slipping and falling on the remainder because the [unremoved] snow or ice remains as a natural accumulation.”
Id.
at 828. The court thereby drew a distinction between removal efforts that alter the natural state of accumulated snow and ice, which if negligently conducted may expose the property owner to liability, and efforts that merely clear a top layer of snow to expose a remaining natural accumulation, which could not provide a basis for liability even if they increase the risk of injury. See
id.
at 827-828. See also
Barrasso
v.
Hillview W. Condominium Trust,
While the shovelling of snow inevitably alters any natural accumulation of snow, the uncertain distinction between a natural and unnatural accumulation of snow has led the Appeals Court to conclude that all snow shovelled into a snowbank does not thereby become an unnatural accumulation, but it can become so in certain circumstances. For instance, in Barrasso, supra at 136, the motion judge found that a three-foot wide snowbank created by the defendant’s plowing was a natural accumulation of snow, which dictated a grant of summary judgment against a plaintiff who had been injured while trying to navigate it. The Appeals Court, relying on evidence that the plaintiff had been injured by a large piece of compacted snow and ice contained within the snowbank, reversed the allowance of the defendant’s motion for summary judgment, concluding, “Even if the movement of naturally accumulated snow into a snowbank by a plow still left it a ‘natural accumulation’ — and that would not be an ordinary usage of the word ‘natural’ — we conclude that under any reasonable interpretation, when snow is compacted by a plow it is not a ‘natural accumulation’ within the meaning of the relevant cases.” Id. at 138. See, e.g., Reardon v. Parisi, 63 Mass. App. Ct. 39, 46 (2005) (reversing grant of summary judgment for defendant property owner where question of fact remained whether ice that formed on parking lot as result of runoff from snow plowed to edge of lot was unnatural condition created or heightened by manner of construction of parking lot).
The Appeals Court has concluded from our precedents that even snow removal efforts that “foreseeably increase the risk of mishap” may not transform a natural accumulation of snow and
*383
ice into an unnatural one, so as to permit a finding of liability.
Goulart
v.
Canton Hous. Auth.,
We now will apply to hazards arising from snow and ice the same obligation that a property owner owes to lawful visitors as to all other hazards: a duty to “act as a reasonable person under all of the circumstances including the likelihood of injury to others, the probable seriousness of such injuries, and the burden of reducing or avoiding the risk.”
Young
v.
Garwacki,
*384 Under this traditional premises liability standard, a fact finder will determine what snow and ice removal efforts are reasonable in light of the expense they impose on the landowner and the probability and seriousness of the foreseeable harm to others. Mounsey, supra at 709. The duty of reasonable care does not make a property owner an insurer of its property; “nor does it impose unreasonable maintenance burdens.” Id. The snow removal reasonably expected of a property owner will depend on the amount of foot traffic to be anticipated on the property, the magnitude of the risk reasonably feared, and the burden and expense of snow and ice removal. Therefore, while an owner of a single-family home, an apartment house owner, a store owner, and a nursing home operator each owe lawful visitors to their property a duty of reasonable care, what constitutes reasonable snow removal may vary among them. See Restatement (Second) of Torts, supra at § 343 comment e. 17
The defendants have urged that, if we were to abolish the rule of natural accumulation, we should apply our new rule only prospectively. We conclude that the circumstances do not warrant an exception from the normal rule of retroactivity. “In general, changes in the common law brought about by judicial
*385
decisions are given retroactive effect.”
Halley
v.
Birbiglia,
*386 Retrospective application of our decision is unlikely to result in hardship or inequity for property owners for two reasons. See Schrottman v. Barnicle, supra at 631-632; Bouchard v. DeGagne, supra. First, because the distinction between natural and unnatural accumulation was so difficult to define, and because a natural accumulation could so easily become an unnatural accumulation, a property owner would not likely rely on the natural accumulation rule in deciding whether to clear walkways, stairs, and parking lots, or in procuring insurance coverage for slip and fall injuries arising from snow and ice. The defendants here plowed and cleared the parking lot even under the theoretical protection of the natural accumulation rule; there is no reason to believe they would have acted differently under the reasonable care standard. Second, most property owners have long been required by State regulations to keep all means of access and egress free of snow and ice at all times. See 105 Code Mass. Regs. § 410.452 (1997) (applying requirement under State sanitary code governing human habitation); 527 Code Mass. Regs. § 10.03(13)(d) (2009) (requiring clear egress from buildings, free of snow and ice, under State fire code); 780 Code Mass. Regs. § 1001.3.2 (2008) (requiring all exterior stairways and fire escapes be kept free of snow and ice under State building code). The reasonable care standard we impose is less demanding than these regulatory requirements.
Conclusion. Because we now abolish the distinction between the natural and unnatural accumulation of snow and ice, and because we apply the premises liability standard of reasonable care retroactively to injuries from slips and falls arising from accumulations of snow and ice, we vacate the allowance of summary judgment in favor of the defendants, and remand the case to the Superior Court for reconsideration of the defendants’ motion for summary judgment in light of this opinion.
So ordered.
Notes
The plaintiff’s wife, Annie Papadopoulos, joined in the suit, claiming loss of consortium resulting from her husband’s injuries. Because her claim is entirely dependent on the viability of her husband’s underlying claim, see
Sena
v.
Commonwealth,
The judge later denied the plaintiff’s motion for reconsideration.
We acknowledge the amicus brief submitted in support of the plaintiff by the Massachusetts Academy of Trial Attorneys, as well as the amicus brief submitted in support of the defendant by the Massachusetts Defense Lawyers Association.
See, e.g., 2 NJ. Landau & E.C. Martin, Premises Liability Law and Practice § 8A.04[2][c] (2010); W.L. Prosser & W.P. Keeton, Torts § 61, at 427-428 n.ll (5th ed. 1984); G. Weissenberger & B.B. McFarland, Premises Liability § 9.15 (3d ed. 2001) (applying term only in context of landlord-tenant law);
Woods
v.
Prices Corner Shopping Ctr. Merchants Ass’n,
In fact, perhaps because this legal principle was so well known, the plaintiff did not claim that the landlord had any duty to clear the snow and ice from the steps in the passageway. Rather, the plaintiff alleged that the landlord was liable for failing to place a railing on either side of the steps, and for constructing the steps in such a manner that “they occasioned the accumulation of ice and snow thereon improperly.”
Woods
v.
Naumkeag Steam Cotton Co.,
Because the plaintiff was an invitee rather than a tenant, the court’s decision in
Urquhart
v.
Smith & Anthony Co.,
The court also rejected the defendant’s contention that, as a matter of law, the plaintiff contributed to the negligence or assumed the risk because he *375 “voluntarily exposed himself to any danger that might be incurred by attempting to use the walk,” concluding that these issues were reserved to the jury. Urquhart v. Smith & Anthony Co., supra at 261. “It manifestly could not have been ruled as matter of law that because the plaintiff observed the icy surface, he fully appreciated the probability of being injured and then voluntarily exposed himself to any danger that might be incurred by attempting to use the walk.” Id.
There was a third legal track, not relevant here, for injuries suffered by a plaintiff on a public way, including a sidewalk and roadway, that abutted a defendant’s property. “The owner or occupant of premises abutting on a public way is under no obligation to keep the sidewalk free of snow or ice
*376
which came there from natural causes.”
Bamberg
v.
Bryan’s Wet Wash Laundry, Inc.,
The court noted in
King
v.
G & M Realty Corp.,
Aylward
v.
McCloskey,
The court also said: “The problem of allocating the costs and risks of human injury is far too complex to be decided solely” by this single consideration of whether the plaintiff is an invitee or licensee, especially where it “often prevents the jury from ever determining the fundamental question whether the defendant has acted reasonably in light of all the circumstances in the particular case."
Mounsey
v.
Ellard,
See
Reardon
v.
Shimelman,
While Maine relies on a general negligence standard for a slip and fall on snow or ice where the plaintiff is a business invitee of the defendant,
Isaacson
v.
Husson College, supra,
Maine has not abandoned the natural accumulation rule as a limitation on a landlord’s liability to a tenant. See
Rosenberg
v.
Chapman Nat’l Bank,
The reasonable care standard we adopt is sometimes referred to as the “Connecticut rule,” because of the Supreme Court of Connecticut’s decision in
Reardon
v.
Shimelman,
Such reliance was a significant consideration, for instance, where the court changed the method of computing time in insurance cancellation cases, see
Tamerlane Corp.
v.
Warwick Ins. Co.,
Our holding today is not to be regarded as in any way benefiting or reviving the action of a plaintiff whose claim for physical injuries has been concluded by judgment or settlement or by the running of the statute of limitations.
Bouchard
v.
DeGagne,
