Colorado Rent
Increase Calculator

Colorado repealed its preemption of local rent control in 2021, but no city has yet enacted a rent control ordinance. Statewide, there is no cap on increases.

Month-to-month tenants require 21 days notice; annual leases require notice before the end of the lease term.

Colorado law explicitly prohibits cities and counties from enacting rent control ordinances. This preemption means tenants in Colorado have no local legal protections capping rent increases — state law is the only applicable framework.

The required notice period before a rent increase in Colorado is **21 days (month-to-month) for standard increases and 21 days** for increases above 10%. Notice must be in writing in virtually all states.

Mid-lease increases are generally void without the tenant's written consent — a landlord cannot raise rent during a fixed-term lease just because they want to. The governing statute is C.R.S.

§ 38-12-301.

The maximum allowable rent increase in Colorado is: No cap — market rate. There is no legal ceiling on the amount of the increase, as long as proper notice is given.

Landlords may raise rent to market rate. The practical limit is what the rental market will bear — raising rent significantly above comparable units risks vacancy.

Rent increases are illegal under any state's law if they are retaliatory or discriminatory. Retaliation — raising rent because a tenant complained about habitability, requested repairs, or contacted a housing authority — is prohibited in virtually every state.

Discriminatory increases based on race, national origin, religion, sex, familial status, or disability violate the Fair Housing Act (42 U.S.C. § 3604).

In Colorado, tenants who believe an increase is retaliatory may assert the defense in court and, if successful, may recover damages and attorney's fees.

Forecasting rent increase exposure: In Colorado without a rent cap, the only protection is adequate notice and the right to choose not to renew at lease end. Tenants in expensive markets facing steep increases should compare comparable units in the area to evaluate whether the proposed rent is at market rate before deciding to accept or move.

Colorado landlords must give **21 days (month-to-month) advance written notice before a rent increase takes effect (and 21 days** for increases over 10%). Notice is only effective from the date it is properly delivered — oral notice does not count.

Best practice is to deliver written notice by certified mail or personal delivery with a signed receipt. Notice delivered by first-class mail may require adding time to account for delivery (often 3–5 days).

A rent increase notice that doesn't meet the notice requirement is unenforceable. Tenants who receive a deficient notice can: (1) continue paying the old rent until proper notice is given, (2) notify the landlord in writing of the deficiency and request corrected notice, or (3) consult a tenant rights organization.

Accepting a new rent amount after deficient notice can constitute waiver in some jurisdictions — so address the problem promptly.

Timing the increase: most rent increases take effect at the start of a new rental period. For a monthly tenancy with a rent payment due on the 1st of the month, a landlord who wants to raise rent starting February 1 must deliver written notice by the required number of days before.

Give tenants the full notice period — courts take notice requirements seriously.

Tenants in Colorado have the right to: (1) receive proper written notice before any rent increase; (2) pay rent at the current rate until valid notice has been given and the notice period has passed; (3) challenge increases in court if proper notice was not given; and (4) assert retaliation or discrimination defenses if the increase was motivated by protected activity or a protected characteristic.

In states without rent caps, tenants who believe an increase is unreasonably high have limited legal recourse absent retaliation or discrimination. The primary leverage is lease negotiation — landlords prefer keeping reliable tenants over vacancy.

A counteroffer at lease renewal is common and often successful, particularly if the tenant has a good payment history.

Tenant resources in Colorado: contact your state's attorney general consumer protection division, local legal aid society, or housing authority for free assistance. Many cities have tenant rights hotlines.

Documenting all communications with your landlord in writing — especially regarding rent increases — is the most important step you can take to protect yourself.

For related landlord-tenant issues in Colorado: the Colorado Security Deposit Return Calculator covers deposit return deadlines and allowable deductions. The Colorado Eviction Timeline Calculator estimates how long the eviction process takes and what notices are required.

For real estate transfer costs, see the Colorado Transfer Tax Calculator. For a case-specific review, find a Colorado landlord-tenant attorney.