Colorado Month-to-Month Lease Agreement

Last Updated: May 13, 2025 by Roberto Valenzuela

A Colorado month-to-month rental agreement is a contract (not necessarily in writing) for a tenant to rent property from a landlord, one month at a time, in exchange for a fee (“rent”). The agreement renews monthly, until either party gives proper notice to end it.

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For information about Colorado fixed-term leases (rentals for a term of one year or more), click here.

Basics of a Colorado Month-to-Month Rental Agreement

In Colorado, a landlord and tenant create a month-to-month lease by agreeing to rent a property according to acceptable terms. Written agreements are clearer and more reliable in case of disagreement, but month-to-month oral (unwritten) leases are legal.

Parties under a month-to-month lease have full rights under Colorado landlord-tenant law. The tenant must use the property in a responsible way and pay rent on time. The landlord must ensure the tenant’s quiet enjoyment of the property. This includes keeping critical features of the property in good working condition.

The main difference between a month-to-month lease and a fixed-term lease is that month-to-month leases can be terminated (with proper notice) by either party, for any reason, without penalty. Landlords also can usually modify terms from one month to the next, again with proper notice.

Required Disclosures for Month-to-Month Rentals in Colorado

Colorado landlords may not rent a property out without making the following disclosures to a potential tenant, as relevant:

  • Landlord’s Name and Address (required for all leases) – All residential leases in the state of Colorado must contain the name and address of the landlord or authorized agent, for smooth communication of legal notice. (Most leases also have information like cell phone number and email address for the parties.) When contact information changes, the landlord must provide updated information within one business day.
  • Radon Gas Disclosure (required for all leases) – Colorado law requires a radon gas disclosure for all residential lease agreements. This must include a a formal statement about the dangers of radon gas, plus current information about radon testing and concentrations on the property. The disclosure is not valid unless signed by the tenant.
  • Income Non-Discrimination Disclosure (required for most leases) – Colorado requires a reminder in most rental agreements that discrimination based on source of income is illegal as long as ability to pay rent is verified. Small-scale landlords operating five or fewer total rental units are exempt from this disclosure requirement.
  • Lead-Based Paint Disclosure (required for some leases)Landlords must provide an EPA-approved disclosure and informational pamphlet to tenants renting any property built before 1978.

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The state page for fixed-term leases may have more detailed information on required disclosures.

Required Notice To End a Month-to-Month Rental in Colorado

Colorado lets either party end a month-to-month lease with at least 21 days of advance notice. In general, it’s valid to end a month-to-month lease for any reason that isn’t landlord retaliation.

Required Notice To Raise the Rent on a Colorado Month-to-Month Lease

Colorado requires written notice for a rental increase, at least 60 days in advance.

Eviction in Colorado Month-to-Month Rentals

Colorado tenants may get evicted if they violate lease terms or stay on the property after the notice period allowed by a valid termination. Evictions in Colorado typically take five to eight weeks.

For more information on the eviction process in Colorado, click here.

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