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Rent Increase Notice Laws in Montana

Montana law lets a landlord change month-to-month lease terms, including rent, with written notice at least 15 days before the end of the month.

Last checked . General information, not legal advice.

Montana at a glance

Notice for month-to-month increase
15 days before end of month
Under a general lease statute. The Residential Landlord and Tenant Act separately requires 30 days' written notice to end a month-to-month tenancy.
Longer notice rule
No longer notice rule
No statute sets a longer notice period for larger increases or longer tenancies.
Statewide rent increase cap
No statewide cap
The statutes reviewed set notice rules but no limit on the amount of an increase.

Sources

Last checked

The rules in Montana

How much notice must a landlord give before raising rent on a month-to-month tenancy in Montana?

Notice for month-to-month increase in Montana: 15 days before end of month. Under a general lease statute. The Residential Landlord and Tenant Act separately requires 30 days' written notice to end a month-to-month tenancy.

Does Montana require longer notice for large rent increases or long tenancies?

Longer notice rule in Montana: No longer notice rule. No statute sets a longer notice period for larger increases or longer tenancies.

Does Montana limit how much a landlord can raise the rent?

No statewide cap. Statewide rent increase cap in Montana: no statewide cap. The statutes reviewed set notice rules but no limit on the amount of an increase.

Where do the Montana rent increase notice laws come from?

The rules above come from MCA 70-26-109, MCA 70-24-441 and MCA 70-24-311. Each source is linked on this page. We last checked them in October 2026.

Good to know

A new landlord rule that substantially changes the tenant's bargain takes effect only after 30 days' written notice for month-to-month tenancies (MCA 70-24-311).

What this means in practice

Put the rent increase in writing, state the new amount and the date it takes effect, and keep a copy along with proof of how and when it was delivered. Count the notice period from the date the tenant actually receives the notice, and check whether your state adds extra days for mailed notices.

Check local law as well as state law. Some cities and counties have rent stabilization ordinances, registration rules, or longer notice periods, and subsidized or rent-regulated units often follow separate federal or program rules.

A rent increase cannot be used to retaliate against a tenant for making a repair request or complaint, or to discriminate against a protected group. If the timing of an increase could look retaliatory, document the business reason for it.

General information, not legal advice. Laws change, and cities can add their own rules, so check the current statute before you rely on it.