Is a rent increase legal in Montana?
No statewide rent cap. 30-day written notice required for any rent change on a month-to-month tenancy.
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How much can rent increase in Montana?
Montana does not currently impose a statewide cap on rent increases. That means landlords can generally raise rent by any amount when a lease ends, as long as they provide proper notice. However, individual cities may have local rent control ordinances — check your municipality's rules.
Notice requirements
Montana requires landlords to give at least 30 days written notice before raising rent on a month-to-month tenant. For fixed-term leases, increases generally only take effect at renewal.
Source
Reviewed against Mont. Code §70-24 (opens in new tab) as of April 2026.