How Much Notice Does a Landlord Need to Raise Rent in Colorado?

A rent increase can land in your inbox with almost no warning — a text, a note taped to the door, a new number on a renewal offer. So the natural question is: is a landlord even allowed to do that, and how much notice do they owe me? In Colorado, the answer isn’t “whatever the landlord wants.” There are limits on how often rent can go up and a requirement that increases come with advance written notice.

The tricky part is that the exact notice period depends on your situation — whether you have a written lease, and what that lease says. Below are the rules that are safe to rely on, the ones that depend on your tenancy, and what to do if a rent increase seems to arrive too fast.

Two rules that are clear

Start with what Colorado law states plainly, because these two rules apply broadly.

Rent can generally go up only once every 12 months. Colorado limits residential rent increases to once per 12-month period for the same tenant (C.R.S. 38-12-702). A landlord can’t raise your rent in March and then again in August. If you’re seeing a second increase inside a single year, that’s worth questioning right away.

An increase requires advance written notice. A landlord can’t spring a higher rent on you effective immediately. Colorado requires written notice before an increase takes effect. A verbal heads-up, or a raise applied without notice, doesn’t meet that standard.

Ask this: Has my rent already gone up once in the last 12 months?

How much notice, exactly?

Here’s where it depends on your tenancy, so treat any single number with care.

The period most commonly cited is 60 days of advance written notice for tenancies without a written lease — a month-to-month arrangement or a verbal agreement (C.R.S. § 38-12-701 sets 60 days for residential tenancies with no written agreement). That’s the general benchmark to have in mind. But the exact required notice can depend on the type of tenancy and on the terms of any written lease you signed, so 60 days is a useful reference point rather than a rule that fits every case.

What you should not assume is that the notice period changes based on the size of the increase. You may hear claims like “only 30 days if the raise is small” — treat those as unverified. The safe framing is simpler: expect advance written notice, commonly around 60 days when there’s no written lease, and confirm the specific requirement for your situation.

Ask this: Did I get this rent increase in writing, and how many days of notice does it give before the new amount starts?

Fixed-term lease vs. month-to-month

Your lease type changes the picture more than anything else.

If you have a written, fixed-term lease (say, a 12-month lease), the landlord generally can’t raise the rent in the middle of that term unless the lease itself allows it. During a fixed term, the lease’s own terms typically govern whether and when rent can change. So the first place to look is your signed lease — check for any clause about mid-term increases or how renewal pricing works. (For more on this, see can a landlord raise rent mid-lease in Colorado.)

If you’re month-to-month or have no written lease, there’s no fixed term protecting the current rent, so a landlord can raise it — but still only once every 12 months, and still with advance written notice (commonly around 60 days, as above).

Ask this: Am I inside a fixed lease term right now, or am I month-to-month?

What if the notice seems too short or improper

If a rent increase feels rushed or off, slow down before you agree to it. A few things to check:

• Timing. Does the notice give you the advance period your tenancy calls for? If it’s month-to-month and the notice gives only a handful of days, that’s a flag.
• Frequency. Has your rent already increased in the past 12 months? A second increase inside a year runs against the once-per-year limit.
• Form. Was it actually in writing? A raise announced verbally, or simply reflected as a higher charge with no notice, doesn’t meet the written-notice requirement.
• Mid-term. Are you still inside a fixed lease term? If so, an increase may not be allowed at all unless your lease specifically permits it.

If something looks wrong, you don’t have to simply accept it. You can point to the notice you received, ask the landlord to clarify the basis and timing in writing, and — if it still seems improper — get advice specific to your situation before you pay the higher amount or sign a renewal.

The bottom line

Colorado gives renters two dependable protections on rent increases: they can generally happen only once every 12 months, and they require advance written notice. The exact notice period depends on your tenancy — commonly around 60 days when there’s no written lease — and if you’re in a fixed-term lease, the lease’s own terms usually control. For the full picture on increases and renewals, see Colorado rent increase and renewal rules.

If a raise or a renewal offer just landed and you’re not sure the terms hold up, a plain-English Lease Risk Report reads your lease and renewal language for you and turns it into a short list of things worth a closer look — and the questions to ask before you sign.

LeaseCheck is an educational lease-risk screening tool. It is not a law firm and does not provide legal advice. Colorado rental laws change; confirm specifics for your situation.