A text that says “pay rent by Friday or I call my lawyer” will not survive a Colorado courtroom. It’s not a notice. It’s a message.
Moving from late rent to a filing that actually holds requires five things, in order. Serve the statutory 10-Day Demand with any required municipal attachment [E1] [E8] [E11]. Deliver it by a method the statute allows [E4]. Calculate the cure deadline under the correct court rule [E5]. Keep late fees out of the rent figure [E2] [E7]. Refuse partial payment during the cure window unless you reserve your rights in writing [E12]. Miss one, and a judge dismisses you weeks later. Clock reset. Rent still gone [D:E4,E5,E6].
What notice do you serve when Colorado rent is late?
Serve the 10-Day Notice to Cure or Vacate on Form JDF 101 [E1] [E8]. Deliver it in person, to a resident age 15 or older, or by posting after diligent effort [E4]. Count Day 1 the day after service, and file only after midnight on Day 10 [E5]. Demand rent only. No late fees [E2].
Key takeaways
- Colorado requires a 10-day cure period under C.R.S. § 13-40-104(1)(d), not the 3 days your old template probably says [E1].
- Text and email are not legal service. Only personal delivery, substitute delivery to a resident age 15 or older, or posting after diligent effort count [E4].
- Under C.R.C.P. 6(a), the service day is Day 0. Filing on Day 10 is premature and can get dismissed with prejudice [E5].
- No late fee until rent is 7 calendar days overdue, capped at the greater of $50 or 5%, and you cannot evict for unpaid late fees alone [E2] [E7].
- One procedural defect costs you 30–60 days and an average $3,200–$4,800 in lost rent [E6].
1. Use the statutory form, and attach what your city requires
Colorado does not accept a generic nationwide notice. You serve the 10-Day Notice to Cure or Vacate under C.R.S. § 13-40-104(1)(d) [E1], on the Colorado Judicial Branch’s Form JDF 101 [E8].
Think of the notice the way a pilot treats a pre-flight checklist. The plane can be mechanically perfect. Skip one item and the flight still doesn’t launch, and nobody argues about intent on the tarmac. Your notice works the same way. The judge isn’t weighing how fairly you behaved. The judge is checking boxes: form, service, clock, amount, conduct.
That’s exactly where most DIY tools let you down. Platforms built for the national rental market, TurboTenant and similar template generators among them, routinely produce notices that ignore Colorado’s 10-day rule and local content requirements [E9]. Plenty of legacy templates still print the retired 3-day standard, which gets you thrown out before anyone even looks at the merits [E1].
If your unit sits inside Denver, Form JDF 101 alone isn’t enough. Denver municipal code requires the Denver Tenant Rights and Resources disclosure to accompany the same notice under D.R.M.C. § 27-115. Leave it off and you face summary dismissal, no matter how perfectly you filled out the state form [E11].
Generic template vs. Colorado-statutory notice
| Element | Generic DIY template [E9] | What Colorado requires |
|---|---|---|
| Cure period | Often 3 days (retired standard) | 10 days under C.R.S. § 13-40-104(1)(d) [E1] |
| Form | Free-form or national PDF | Form JDF 101 [E8] |
| Service | “Send it to your tenant” | Personal, substitute (age 15+), or posting after diligent effort [E4] |
| Clock math | Not calculated | C.R.C.P. 6(a): Day 0 excluded, expires midnight Day 10 [E5] |
| Late fees | Rolled into the balance due | Excluded; 7-day trigger, $50-or-5% cap [E2] [E7] |
| Local attachment | None | Denver Tenant Rights and Resources, D.R.M.C. § 27-115 [E11] |
2. Deliver it the way the statute allows
A correct form served the wrong way is a dead filing. C.R.S. § 13-40-108 gives you three options and nothing else: hand it to your tenant, hand it to a resident on the premises age 15 or older, or post it in a conspicuous place after a documented, diligent effort to serve in person [E4].
Texting or emailing the notice, the instinct almost every reluctant landlord reaches for first because it avoids the doorstep, is not valid service in Colorado [E4]. Improper service is grounds for automatic dismissal of your Unlawful Detainer complaint [E4]. Document what you did and when you did it.
3. Count the clock under C.R.C.P. 6(a)
Once you serve, the math starts, and it’s unforgiving. Under Colorado Rule of Civil Procedure 6(a), the day you serve is Day 0. The next calendar day is Day 1. The cure period doesn’t expire until midnight on Day 10, shifting if that day lands on a weekend or legal holiday [E5].
File in county court on Day 10 itself and your case is premature, dismissible with prejudice [E5]. Self-managing landlords miscount this constantly, then restart the whole sequence from scratch [E5]. Write the deadline on a calendar the day you serve. Not the day you get impatient.
4. Strip late fees out of the rent demand
Your notice demands rent. Nothing else.
Under SB 21-173, you cannot charge a late fee until rent is at least 7 calendar days overdue, and the fee is capped at the greater of $50 or 5% of the past-due amount [E2] [E7]. You also cannot evict a tenant solely for unpaid late fees [E2]. Fold a premature or inflated fee into your pay-or-quit figure and the whole notice fails [E2]. Exceed the cap and you’re also exposed to statutory penalties payable to the tenant [E7].
5. Don’t let a partial payment waive your notice
A flawless notice, properly served, correctly counted, can still collapse because of money you never manually accepted.
Accepting any partial rent payment during the 10-day cure window, including an automated portal quietly pulling in auto-pay funds, can waive your notice to quit entirely unless you execute a written reservation of rights at the same time [E12]. Turn auto-collection off the moment you serve. Courts in different judicial districts treat this inconsistently, which is exactly why you don’t want to be the test case [E12].
FAQ
Can I email or text the pay-or-quit notice? No. Email and SMS alone are not valid service under C.R.S. § 13-40-108. Use personal delivery, delivery to a resident age 15 or older, or posting after diligent effort [E4].
Is it still a 3-day notice in Colorado? No. Residential non-payment requires a 10-day cure period under C.R.S. § 13-40-104(1)(d) [E1]. Templates citing 3 days are outdated [E1].
When can I add a late fee? Only after rent is at least 7 calendar days overdue, capped at the greater of $50 or 5% of the past-due amount, and never inside the rent demand itself [E2] [E7].
Do I have to mediate before filing? If you own 5 or fewer residential rental properties, you’re exempt from the HB 23-1120 pre-filing mediation requirement that otherwise applies when a tenant receives SSI, SSDI, or Colorado Works cash assistance [E3]. Document your unit count so you can assert it.
What if my tenant pays part of the rent on Day 6? Accepting it can waive the notice unless you sign a written reservation of rights at the same time [E12].
The part nobody warns you about
The money you lose here rarely disappears at the doorstep. It disappears on the calendar. Reluctant landlords wait an average of 14–21 days past the delinquency date before serving anything, because serving feels like escalation [E10]. Then one technical defect forces a 30–60 day restart and an average $3,200–$4,800 in direct lost rent, before any fee-shifting exposure [E6]. You paid twice. Once for hesitating, once for a checkbox.
A correct notice isn’t an act of aggression. It’s actually the least confrontational tool you have, because it replaces a conversation with a document.
What now
Download the Colorado Compliance Checklist & Statutory Guide for Colorado Pay-or-Quit Notices. It builds the correct JDF 101 demand with the Denver attachment when required [E1] [E8] [E11], calculates your C.R.C.P. 6(a) cure deadline [E5], strips non-compliant late fees [E2] [E7], and flags the partial-payment waiver trap before you serve [E12].
Rensure is the defensibility layer for DIY landlords carrying personal, non-delegable liability in Colorado. Get the checklist before your next late-rent text becomes a dismissed case.