Adverse possession requires 5 years of continuous unauthorized possession under Mont. Code Ann. § 70-19-411
In Montana, an adverse-possession claim can ripen in as little as 5 years under Mont. Code Ann. § 70-19-411. That is one of the shortest — and therefore highest-risk — windows anywhere in the country. For comparison, owners in some states enjoy two or three decades of breathing room; a Montana landlord has roughly half a decade. A vacant rental, an inherited parcel, or a back lot you rarely visit can become the subject of an ownership claim faster than many property owners ever imagine.
The practical lesson is simple: time is not on your side, and inattention is expensive. The good news is that the clock is easy to interrupt. A single eviction filing or a documented written demand to vacate resets the five-year period and defeats the "continuous" element a squatter must prove. Knowing how that period runs — and acting before it matures — is the difference between a routine removal and a contested quiet-title fight.
To claim title by adverse possession in Montana, an occupant must satisfy every element for the full 5-year period set by Mont. Code Ann. § 70-19-411. The possession must be hostile (without the owner's permission), actual (physically using the land), open and notorious (visible, not secret), exclusive (not shared with the true owner or the public), and continuous for the entire span.
Montana adds a distinctive requirement that raises the bar for claimants: the statute contemplates possession with color of title and payment of taxes. A claimant who cannot show that they paid the property taxes during the five years generally cannot perfect a claim, no matter how long they squatted. That tax-payment hook is a meaningful defense — but it is no substitute for acting fast, because a determined occupant can pay taxes too.
Because the period is only 5 years, prevention beats litigation. The continuous and hostile elements are fragile, and an owner who asserts control destroys them. The cleanest interruption is legal action: a single eviction or ejectment filing resets the clock to zero and forecloses the continuity a claimant needs under Mont. Code Ann. § 70-19-411.
Short of a lawsuit, document everything. Send a dated written demand to vacate, inspect vacant parcels on a schedule, post no-trespassing signage, and keep your property-tax payments current so no occupant can claim to have paid them. Photograph the property, retain receipts, and grant any permitted use in writing — permission negates the "hostile" element entirely. For absentee owners and out-of-state heirs, a routine annual check on Montana land is the single most valuable habit you can build.
Not every unwanted occupant is a squatter. A holdover tenant entered under a lease and simply overstayed; a squatter never had permission at all. The distinction matters because a former tenant's occupancy began with your consent, which undercuts the "hostile" element of an adverse-possession claim — but it does not let you skip the courthouse.
In Montana, self-help removal is illegal. You may not change the locks, remove the occupant's belongings, shut off the heat, water, or electricity, or otherwise force someone out without a court order. Those tactics expose you to liability and can hand the occupant leverage, even when their underlying claim is weak. Whether the person is a holdover tenant or a true squatter, the lawful exit is the same: a court process.
Removal in Montana runs through the courts, not the front door. Serve a written notice to vacate appropriate to the occupant's status, then file the proper action — an eviction (unlawful-detainer) proceeding for someone who entered as a tenant, or an ejectment/quiet-title action where a stranger claims a right to the land. Once a judge issues a judgment for possession, a sheriff or other authorized officer carries out the physical removal.
Filing does double duty: it removes the occupant and it resets the 5-year clock under Mont. Code Ann. § 70-19-411, eliminating any continuity a future claim would require. The mistake landlords regret most is waiting — hoping the problem leaves on its own while the statutory period quietly runs. With Montana's average rent at roughly $887 a month, the carrying cost of a delayed filing adds up fast, and the legal exposure compounds far beyond that.
There is an important legal distinction between these two types of unauthorized occupants. A holdover tenant is a former leaseholder, someone who once had a valid lease who remains in the unit after that lease has expired without the landlord's consent and without executing a new lease. In Montana, holdover tenants are typically treated as month-to-month tenants or as tenants at sufferance depending on whether the landlord continues to accept rent. They must be removed through the formal eviction process with appropriate notice.
A squatter (or trespasser) is someone who entered the property without any prior legal right to do so, they never held a lease with the landlord. Despite having no legal right of occupancy from day one, squatters cannot be physically removed by the landlord without a court order in Montana. Changing the locks, removing belongings, or shutting off utilities to force a squatter out constitutes illegal self-help eviction and can expose the landlord to civil liability.
Five years. Under Mont. Code Ann. § 70-19-411, an occupant must possess the property continuously for 5 years — and the statute contemplates color of title and payment of the property taxes during that time. It is one of the shortest adverse-possession windows in the country, so Montana owners should treat any unpermitted occupancy as urgent.
Usually not on their own. Adverse possession is treated as a civil property dispute, so police generally will not evict an occupant who claims a right to be there without a court order. You typically must obtain a judgment for possession through an eviction or ejectment action; a sheriff then enforces the removal. Police may assist where there is a clear, recent criminal trespass, but for an established occupant the court route is the reliable path.
A holdover tenant moved in under a lease and stayed past its end; a squatter never had permission at all. The distinction matters for adverse possession because a tenant's occupancy started with your consent, which undercuts the "hostile" element a claim requires. Either way, you must remove them through the courts — self-help lockouts and utility shutoffs are illegal in Montana.
Interrupt the five-year clock before it matures. A single eviction or ejectment filing resets it to zero. Short of suing, send a dated written demand to vacate, inspect vacant or absentee-owned land at least annually, keep property taxes paid so no occupant can claim to have paid them, post no-trespassing signs, and put any permitted use in writing — permission defeats a claim outright.
This analysis was prepared by the Eviction Risk Map research team and reflects the adverse-possession period set by Mont. Code Ann. § 70-19-411. Last reviewed June 2026. It is general information, not legal advice; statutes and their interpretation change, and individual situations vary. Consult a licensed Montana attorney before taking action on a specific property.
Adverse possession data sourced from Mont. Code Ann. § 70-19-411. Eviction notice data from U.S. Census Bureau ACS 2023 and Mont. Code § 70-24-422. Last updated August 17, 2026. This page is for informational purposes only and does not constitute legal advice. Consult a licensed real estate attorney for your specific situation.
