How Long Do You Have to Report a Work Injury in Colorado? Notice and Filing Deadlines

Two Colorado statutes decide whether an injured worker’s claim survives: the notice deadline under C.R.S. 8-43-102(1)(a) and the filing deadline under C.R.S. 8-43-103. Miss the first and your benefits get reduced. Miss the second and the claim is barred entirely, no matter how serious the injury or how clearly your employer was at fault.

This is a walkthrough of both deadlines — how they work, what “date of injury” means for repetitive-stress and occupational-disease claims, what happens if you miss either window, and how the timing interacts with any parallel third-party civil claim.

Colorado’s 4-day notice rule: report the injury to your employer

Under C.R.S. 8-43-102(1)(a), an injured worker must give the employer written notice of an injury within 4 working days of the injury (excluding the day of injury). The purpose of the rule is to let the employer investigate promptly, direct medical care, and give the workers’ comp carrier a chance to admit or deny the claim while the facts are still fresh.

What counts as notice:

Written notice is what the statute requires. Verbal notice may still be effective if it is unambiguous and the employer acknowledges it, but you should never rely on verbal notice alone.
The notice must identify the fact of injury, the general nature, and when and how it happened.
Delivery to a supervisor, HR, an owner, or any person with authority to act for the employer is sufficient. Delivery to a coworker with no authority is not.

Most Colorado employers have a First Report of Injury form or a workers’ comp intake process. Ask for it. Fill it out completely. Keep a copy for yourself. Take a photo of your copy on your phone as backup.

Written notice vs. verbal notification: why the difference matters

Verbal reporting is one of the top three reasons work-injury claims fall apart at hearing. The pattern:

Worker tells supervisor about the injury the day it happens.
Supervisor doesn’t file anything.
Worker keeps working, symptoms worsen.
Worker sees a doctor two weeks later.
Insurer investigates, supervisor now claims not to remember the report or the conversation.
Insurer denies the claim on notice grounds.

Written notice defeats this scenario. An email to a supervisor and to HR the same day of the injury — even one paragraph long — is enough. Text messages with clear timestamps also work. Do it the day of the injury or the next morning at the latest.

The 2-year filing deadline for the formal claim

Reporting the injury to your employer is not the same as filing a workers’ comp claim with the state. Under C.R.S. 8-43-103(2), an injured worker must formally file a claim with the Division of Workers’ Compensation within 2 years of the date of injury. Some occupational disease claims and cases with reasonable excuse extend to 3 years.

“Filing a claim” means submitting a Worker’s Claim for Compensation (Form WC 15) to the Division. The employer’s report and the insurer’s admission or denial are separate from your formal claim. Do not assume the employer’s filing is your filing.

The “date of injury” question — and why it matters

For a traumatic single-event injury (fall from a ladder, machinery accident, motor vehicle crash on the job), the date of injury is straightforward: the date the accident occurred.

For occupational diseases and cumulative-trauma conditions, the date of injury is the earlier of:

The date the disease or condition disabled you from working, or
The date you knew or should have known the condition was work-related.

C.R.S. 8-41-203(1)(b) and Colorado case law (including City of Durango v. Dunagan, 939 P.2d 496) apply the “discovery rule” to occupational disease claims: the clock starts running when a reasonable person in your position, having received medical advice, would have connected the condition to their employment. Not the date of first symptoms.

This distinction matters enormously for conditions that develop slowly — hearing loss, chronic back injuries, repetitive stress injuries, respiratory conditions, some cancers. A 15-year construction worker who develops carpal tunnel or bilateral rotator cuff tears has an occupational-disease claim, and the reporting and filing clocks start when the connection to work is medically established, not when the symptoms first appeared.

Repetitive stress and occupational illness

Repetitive-strain injuries account for a substantial share of Colorado workers’ comp claims — carpal tunnel syndrome, cubital tunnel, tendinitis, chronic low back injuries from lifting, hearing loss, respiratory sensitization. For these:

Notice trigger: 4 working days from when you knew or should have known the condition was work-related. Not from first symptoms.
Filing trigger: 2 years from the same discovery date.
The medical record matters. The first treating provider’s note that ties the condition to work usually anchors the discovery date. Get that language in writing.

For occupational disease specifically, C.R.S. 8-41-304 requires the condition to arise out of and in the course of the employment. That’s a substantive requirement, not a procedural one, but it’s frequently disputed at the notice and filing stage because insurers will argue the condition was pre-existing.

What happens if you miss the 4-day reporting deadline

The claim is not automatically denied. Under C.R.S. 8-43-102(1)(a), late notice results in:

A one-day reduction of compensation for each day of late notice, up to the point that the employer or insurer suffered actual prejudice.
If the delay caused genuine prejudice — the employer couldn’t investigate the scene, couldn’t direct timely medical care, couldn’t identify witnesses — the claim can be denied entirely.
The insurer bears the burden of proving prejudice. Simple delay without demonstrable harm is not enough to defeat the claim.

Practical read: reporting a week late usually costs a week of benefits. Reporting six months late in a way that ate up the entire investigation window can cost the case.

What happens if you miss the 2-year filing deadline

The claim is barred. Period. C.R.S. 8-43-103(2) is a jurisdictional statute of limitations, and the Division of Workers’ Compensation cannot hear a claim filed after the deadline runs. Limited exceptions:

Occupational disease with a discovery-rule extension may push the clock later than 2 years from first symptom.
Fraud, misrepresentation, or willful concealment by the employer or insurer can toll the deadline in narrow circumstances.
Reasonable excuse extensions to 3 years in some occupational disease and psychiatric injury cases.
Minors and legally incapacitated persons have modified deadlines.

Do not count on any of these. The rule is 2 years; the exceptions are narrow and fact-specific.

How the deadlines interact with a third-party civil claim

If someone other than your employer contributed to the injury — a distracted driver who hit you while you were driving for work, a subcontractor whose safety failure injured your crew, a defective machine — you may have a separate civil claim in addition to workers’ comp. The deadlines are different:

Motor vehicle third-party claim: 3 years under C.R.S. 13-80-101(1)(n).
Other tort claims: 2 years under C.R.S. 13-80-102.
Product liability against a defective machine: 2 years under C.R.S. 13-80-102, with a statute of repose provision at C.R.S. 13-80-107 for products.

The workers’ comp deadline and the tort SOL run independently. Missing the workers’ comp filing deadline does not extinguish the third-party civil claim, and vice versa. But early legal review lets you protect both.

Step-by-step: how to properly report a workplace injury in Colorado

Get medical attention immediately if you need it. If it’s an emergency, call 911. Otherwise, ask about the employer’s designated medical provider — Colorado allows the employer to designate the initial treating provider under C.R.S. 8-43-404.
Notify your supervisor the same day, in writing. Email is fine. State the date, time, location, mechanism of injury, and body parts affected. Keep a copy.
Notify HR the same day, in writing. If there is no HR, notify a corporate officer or owner. Same email is fine.
Fill out the employer’s incident report form if they have one. Keep a copy.
Follow up with your treating provider and make sure the medical record documents the injury as work-related.
Confirm the employer filed the First Report of Injury with the Division and the insurer. Follow up within 5-7 days if you haven’t received notice of an insurer or a claim number.
If the insurer denies or delays, file your own Worker’s Claim for Compensation (WC 15) with the Division well before the 2-year deadline — ideally within the first 6 months, not the last week.
Consult an attorney if the claim is denied, benefits are late or short, or the injury is serious.

Injured near I-25, Highway 24, or anywhere in El Paso County

Work-related motor vehicle crashes on Colorado Springs highways are workers’ comp claims and third-party civil claims at the same time. If you were driving for work and someone else caused the crash on I-25, Powers Boulevard, Highway 24, or any other roadway, both claims run in parallel. The workers’ comp claim protects your immediate wage-replacement and medical needs; the third-party claim recovers the full damages workers’ comp doesn’t cover.

Why acting quickly helps your claim

Evidence disappears. Witnesses forget, video footage is overwritten, incident scenes get cleaned up.
Medical causation gets harder to prove. The longer you wait to see a doctor and connect the condition to work, the more room the insurer has to argue it was pre-existing or unrelated.
Retaliation is easier to spot when it’s close in time. C.R.S. 8-2-116 and 8-2-118 protect workers from retaliation for filing a workers’ comp claim, but proving retaliatory intent gets harder the longer the gap between the report and the adverse action.
Benefits start sooner. Once the claim is admitted, TTD payments begin retroactive to the fourth day of lost work. The clock doesn’t start until you report.

When to contact a Colorado Springs workers’ comp attorney

Immediately if:

Your claim has been denied.
You missed the 4-day notice window and the insurer is challenging the claim.
You have an occupational disease and the “date of injury” is disputed.
Someone else caused the injury and you may have a third-party claim.
Your employer is threatening or retaliating for filing the claim.
Benefits are late, short, or have stopped.

Bradford Pelton PC handles Colorado workers’ compensation cases on contingency — no fee unless we recover for you. Call (719) 634-8828 for a free consultation.

Frequently asked questions

How long do I have to report a work injury in Colorado?

Four working days under C.R.S. 8-43-102(1)(a). Written notice to a supervisor, HR, or an authorized representative of the employer. For occupational diseases and repetitive stress injuries, the clock runs from the date you knew or should have known the condition was work-related.

What happens if I miss the 4-day reporting deadline?

Benefits can be reduced by one day of compensation for each day of late notice. If the delay caused actual prejudice to the employer or insurer (loss of investigation opportunity, inability to direct medical care), the claim can be denied entirely.

What’s the difference between reporting an injury and filing a workers’ comp claim?

Reporting is the 4-day written notice to your employer. Filing is the formal Worker’s Claim for Compensation (WC 15) submitted to the Division of Workers’ Compensation. The employer’s First Report of Injury is not the same as your formal claim.

How long do I have to file a workers’ comp claim in Colorado?

Two years from the date of injury under C.R.S. 8-43-103(2). Some occupational disease and psychiatric injury claims extend to three years on reasonable excuse.

Can a hernia be covered under workers’ comp?

Yes, if the hernia arises from a specific work-related event or exertion. Colorado applies specific proof requirements for hernia claims: the condition must have appeared suddenly, must have followed a specific work event, and must have been reported to the employer within the standard notice window.

Is bursitis or tendinitis covered under workers’ compensation?

Yes, when caused by cumulative trauma or occupational exposure. These are occupational disease claims under C.R.S. 8-41-304 and run on the discovery-rule clock, not the date-of-injury clock.

What happens if I’m already receiving medical treatment for the injury?

Getting treatment doesn’t satisfy the notice requirement. You still have to report the injury to your employer within 4 working days. Making sure the medical records document the condition as work-related is separate from — and does not substitute for — giving the employer written notice.

Can I still recover if I missed the 2-year filing deadline?

Almost never for the workers’ comp claim itself. Narrow exceptions exist for fraud or misrepresentation by the employer or insurer, for minors or legally incapacitated persons, and for occupational diseases with a delayed discovery date. A third-party civil claim, if one applies, has a separate deadline that may still be open.