How to Serve Someone in Small Claims Court Colorado

The 15-Day Rule

Under C.R.C.P. Rule 504, you must serve the defendant at least 15 calendar days before the scheduled trial date. If service is not completed by that deadline, the judge may continue the case to a new date — or dismiss it outright if you cannot get it done.

The plaintiff is responsible for service, not the court. The clerk issues the summons on Form JDF 250, but getting those papers into the defendant's hands is your job.

Four Ways to Serve

1. County Sheriff

Contact the civil division of the sheriff's office in the county where the defendant lives or works. Fees vary by county but typically run $30 to $65. The deputy personally delivers the papers to the defendant and files a return of service with the court.

This is the most reliable method when you know the defendant's home or work address.

2. Private Process Server

A licensed private process server does the same job as the sheriff, often with more flexible scheduling. Expect to pay $50 to $100 per attempt. Private servers are useful when the defendant is hard to pin down at regular hours.

3. Disinterested Adult

Any person who is at least 18 years old and not a party to the case can serve the defendant. This is the cheapest option — often a friend or family member who is not involved in the dispute. They hand the papers directly to the defendant, then complete the Affidavit of Service (Part 4 of JDF 250) under notary seal or penalty of perjury.

You cannot serve the defendant yourself.

4. Court Clerk Certified Mail

Under C.R.C.P. Rules 502 and 504, you can ask the court clerk to send the papers by certified mail with restricted delivery and return receipt requested. Service is complete only when the clerk receives the signed green return-receipt card bearing the defendant's signature.

If the defendant refuses to sign or the mail is returned unclaimed, certified mail service has failed and you need to use one of the other methods.

Serving a Business Entity

If the defendant is a corporation or LLC, service must go to an officer, manager, or the designated Registered Agent — not to a random employee at the front desk. Look up the Registered Agent's name and address at coloradosos.gov before choosing your service method.

For sole proprietorships, serve the individual owner personally.

Personal Service at Home or Work

C.R.C.P. Rule 304(d) also permits personal service at the defendant's usual home by leaving the papers with an adult family member, or at the defendant's usual workplace with a supervisor, secretary, administrative assistant, bookkeeper, human resources representative, or managing agent.

Court-Ordered Substituted Service

If personal service cannot be completed, C.R.C.P. Rule 304(e) allows you to ask the court for substituted service. File a motion supported by an affidavit that describes the attempts at personal service, identifies the proposed recipient, and gives the defendant's known home and workplace addresses. If the court approves, follow its order for delivery and mailing.

Proof of Service

After service is complete, you must file proof with the court. The mechanism depends on the method:

• Sheriff: The deputy files the return directly with the court
• Private server or disinterested adult: Complete Part 4 of Form JDF 250 (Affidavit of Service) — it must include the date, time, physical location, and description of the person served, signed under notary seal or penalty of perjury
• Certified mail: The clerk verifies receipt of the signed green card

Proof of service must be filed before or on the trial date. Without it, the judge will not proceed — even if you know the defendant was served.

What If Service Fails

If certified mail comes back unsigned, or the sheriff cannot locate the defendant, you still have time as long as the trial date is more than 15 days away. Switch to another method. If the trial is too close, contact the clerk to request a continuance before the hearing date.

A defendant who refuses service during a personal delivery attempt is still considered served — the server identifies the documents, offers them, and leaves them in the defendant's presence. The refusal is noted on the Affidavit of Service.

Proper service is the prerequisite for everything that follows. If the defendant is not validly served, any default judgment you win can be set aside. The Colorado small claims filing guide includes a service method decision matrix and a calendar tracker to keep you within the 15-day window.

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