Colorado Service of Process Rules: 63-Day Deadline and Methods

Under Colorado’s service of process rules, you have 63 days after filing your complaint to deliver the summons and complaint to the defendant, and the method has to match one of the options laid out in Rule 4 of the Colorado Rules of Civil Procedure. The rule treats individuals, businesses, and government bodies differently, and it draws a sharp line between personal service (which you can do on your own) and substituted service or publication (which need a court order). Missing the deadline or picking the wrong method can get your case dismissed, so the details matter.

Who Is Allowed to Serve the Papers

Anyone at least 18 years old who is not a party to the lawsuit can serve process in Colorado.¹ If you are the plaintiff, you cannot hand the papers to the defendant yourself. Most plaintiffs hire a private process server or use the county sheriff, who is authorized to serve within the county and may charge the same fees allowed for district court process.² Colorado does not license private process servers, but they still have to follow every procedural rule for the service to hold up.

The 63-Day Deadline and What Counts as Good Cause

Once the complaint is filed, the 63-day clock starts. If service is not complete by day 63, the court can dismiss the case without prejudice on its own or on a motion, or it can order you to finish service within a set time.³ A dismissal without prejudice sounds forgiving, but the statute of limitations keeps running the whole time, and refiling can cost you your original filing date.

If you can show good cause for the delay, the court must extend the deadline for an appropriate period.³ Good cause generally means you were actively trying to serve the defendant but ran into obstacles you could not control. Forgetting or starting late is not good cause. Judges look at what you actually did during the 63 days, so keep a dated log of every attempt.

Personal Service on an Individual

Personal service is the default method and the one Colorado courts trust most. Under C.R.C.P. 4(e)(1), you can serve an adult in any of these ways:¹

Hand-delivering the documents to the defendant.
Leaving them at the defendant’s usual home with a family member who is at least 18.
Leaving them at the defendant’s usual workplace with a supervisor, secretary, administrative assistant, bookkeeper, human resources representative, or managing agent.
Delivering them to a person authorized by appointment or by law to accept service for the defendant.

Defendants sometimes think refusing the papers ends the matter. It does not. If the defendant refuses to take them, the server can leave them in a conspicuous place nearby and service is still valid, as long as the defendant was identified and had the chance to receive them.

Abode service and workplace service are the practical fallbacks when the defendant is hard to catch in person. Leaving papers with a defendant’s spouse at home, or with a supervisor at the office, counts as valid personal service. No court permission needed.

Substituted Service: The Step That Requires a Court Order

This is where filers most often go wrong. Substituted service under C.R.C.P. 4(f) is not the same thing as leaving papers with a family member at home. Abode and workplace service are forms of personal service. Substituted service is a separate, more involved process that requires a court order before you can use it.¹

You can only request it after personal service has failed and publication is not available. To get the order, file a motion supported by an affidavit from the person who tried to serve the defendant. The motion must explain:

What efforts were made to accomplish personal service and why they failed.
Who you propose to deliver the documents to instead.
The defendant’s last known home and workplace addresses.

The court will grant the motion only if it is satisfied that you used due diligence, that further attempts at personal service would be pointless, and that the proposed delivery is reasonably likely to give the defendant actual notice. If approved, the court authorizes delivery to the designated person and requires you to mail a copy to the defendant’s known addresses on or before the date of delivery.¹ Service is complete on the delivery date.

Service by Publication

Publication is the last resort, reserved for defendants you truly cannot locate. Under C.R.C.P. 4(g), you can ask the court to authorize a legal notice in a newspaper of general circulation in the county where the case was filed. Before approving publication, the judge will want evidence you exhausted other options: public records searches, attempts at every known address, and other reasonable efforts to find the defendant. Once approved, the notice runs once a week for five consecutive weeks and must identify the parties, briefly describe the lawsuit and the relief sought, and tell the defendant how to respond.⁴

Publication is legally valid but weak. There is no guarantee the defendant will ever see the notice, and default judgments obtained through publication are more vulnerable to being challenged later. Courts want to see personal and substituted service ruled out first.

Serving a Business

Serving a business follows a specific chain of eligible recipients under C.R.C.P. 4(e)(4), covering corporations, LLCs, partnerships, trusts, and other legally recognized entities. Start with the registered agent listed in the entity’s most recent filings with the Colorado Secretary of State.¹ Almost every entity on record with the Secretary of State must keep a registered agent with a Colorado address.⁵

If the registered agent is unavailable, you can serve one of the following, depending on the type of entity:

For a corporation: an officer, or that officer’s secretary or assistant.
For a partnership: a general partner, or that partner’s secretary or assistant.
For a manager-managed LLC: a manager, or that manager’s secretary or assistant.
For a member-managed LLC: a member, or that member’s secretary or assistant.
For a trust: a trustee, or that trustee’s secretary or assistant.

If none of those people can be found in Colorado, you can serve any shareholder, member, partner, director, agent, or principal employee who can be found in the state.¹ When a business has failed to maintain a registered agent at all, C.R.S. 7-90-704(2) lets you serve by certified mail, return receipt requested, to the entity’s principal address.⁵

Serving a Government Entity

Suing a city, county, or state agency requires delivering the papers to the right official. Getting this wrong invalidates service. Under C.R.C.P. 4(e):⁶

For a municipality: serve the mayor, city manager, clerk, or deputy clerk.
For a county: serve the county clerk, chief deputy, or a county commissioner.
For the State of Colorado: serve the Attorney General.
For a state department or agency: serve the principal officer, chief clerk, or other executive employee of the agency, and also serve a copy on the Attorney General.

The dual-service requirement for state agencies is easy to miss. You need to serve both the agency and the Attorney General. Skipping either delivery leaves you with defective service.

Out-of-State and International Defendants

Colorado’s long-arm statute, C.R.S. 13-1-124, allows the state’s courts to reach nonresident defendants who have taken certain acts connected to Colorado, including conducting business here, committing a wrongful act here, owning or using real property here, contracting to insure a person or risk located here, or maintaining a marital home here for support and family law matters.⁷

For the mechanics, C.R.C.P. 4(d) allows service anywhere in the United States by any non-party who is at least 18, using the same personal service methods you would use inside Colorado.¹ For international service, Colorado permits any internationally agreed means reasonably calculated to give notice, methods allowed by the foreign country’s law, or methods directed by the foreign authority or the court, as long as they are not prohibited by an international agreement. Where the Hague Service Convention applies, its process typically routes documents through a central authority in the receiving country and can take several months. The Colorado Court of Appeals has held that C.R.C.P. 4(f) substituted service can still be used on a foreign national if you first show due diligence in attempting personal service.

Summons Contents and Proof of Service

The summons can be signed and issued by either the court clerk (under the court’s seal) or the plaintiff’s attorney.¹ It must list the court and county, the parties, the defendant’s response deadline, a warning that default judgment may follow if the defendant does not respond, and the attorney’s name, address, and registration number (or the plaintiff’s address, if unrepresented). Unless the court orders otherwise or service is by publication, the complaint has to be served with the summons; a summons alone will generally not count.

After service is done, file proof of it with the court. Colorado uses Affidavit of Service form JDF 98, which the server signs under penalty of perjury.⁸ The affidavit confirms the server is at least 18 and not a party, lists the documents served, and records the name of the person served, the date, time, and location, the method used, and any service fees. If personal service was not completed, the form also requires the server to document every attempt with dates and specific efforts. That record is what you will lean on if you later need substituted service or publication.

What Happens If Service Is Defective

Defective service is not a technicality courts wave through. If the defendant was not served properly, the court may lack personal jurisdiction, and any judgment can be void. A defendant who learns about a case after a default judgment can file a motion to quash service, arguing the summons and complaint were not delivered according to the rules.⁹ If the court agrees, it will vacate the judgment and any orders that followed.

For plaintiffs, the fallout cascades. You may need to re-serve, which restarts the defendant’s response clock. If the 63-day window has passed, you will need to show good cause or face dismissal. And if the statute of limitations ran during the delay, the claim can be gone for good.

For defendants, the timing matters just as much. Responding to the lawsuit before challenging defective service can waive the objection. If service was improper, raise it before filing any other response. Answering the complaint or otherwise participating in the case can cost you the right to argue the court never obtained jurisdiction over you.

1
Colorado Rules of Civil Procedure. Colorado Rules of Civil Procedure Rule 4 – Process
2
Justia. Colorado Code 13-6-307 – Process
3
Colorado Judicial Branch. Rule Change 2013(12) – Colorado Rules of Civil Procedure
4
Colorado Judicial Branch. Instructions to Request Service by Publication
5
Colorado Secretary of State. Registered Agent – Business FAQs
6
Colorado Judicial Branch. Colorado Rules of Civil Procedure Rule 4 – Process
7
Justia. Colorado Revised Statutes Section 13-1-124 – Jurisdiction of Courts
8
Colorado Judicial Branch. JDF 98 – Affidavit of Service
9
Colorado Judicial Branch. Motion to Quash Service of Summons and Complaint