Process Serving in Colorado

Colorado’s district courts are courts of record, and county courts have their own civil procedure rules, including Rule 304 on service of process. Colorado’s state court system also includes the Supreme Court, Court of Appeals, and specialized courts. The governing service procedure depends on the court and case type: general civil cases in courts of record follow the Colorado Rules of Civil Procedure, while county-court civil cases follow the Colorado Rules of County Court Civil Procedure. The Colorado Supreme Court amended C.R.C.P. 4 in 2025, with that change effective March 16, 2026. Court Runner USA connects you with process servers who serve papers across Colorado.

General information, not legal advice. Last checked October 2026.

Sources:

• Colorado Rules of Civil Procedure and County Court Rules
• Colorado Supreme Court Rule Change 2025(25), effective March 16, 2026
• Colorado Judicial Branch: Adopted and Proposed Rule Changes

Colorado’s civil procedure rules generally permit service by the sheriff, a deputy or another person at least 18 years old who is not a party to the action. The Colorado Judicial Branch’s service affidavit form likewise requires the server to declare that they are at least 18 and not a party. The applicable rule contains separate provisions for service on individuals, entities, public bodies and other parties; the method should be matched to the defendant and case. The court may authorize a different method in appropriate circumstances. The sources reviewed do not establish a general statewide license or certification for private process servers. County-court service is addressed separately by Rule 304, and special proceedings may have their own provisions or court orders. Confirm the current rule applicable to the court and type of process before service.

Sources:

• Colorado Civil Rules, Rule 4 and Rule 304
• Colorado Judicial Branch Affidavit of Service, JDF 98
• Colorado Judicial Branch, Rule Change 2025(25)

Colorado’s civil rules provide for personal service of initial process and set out who may receive service for individuals, businesses and public entities. For an individual, the authorized methods include personal delivery and specified substituted service, such as leaving papers at a usual abode with a qualifying adult family member or at a usual workplace with a specified person; the rule also allows service on an authorized agent. Publication or service by mail may be available under rule-specified circumstances or court order. Colorado’s Secretary of State explains that business entities may be served through their registered agent, and describes registered-mail or certified-mail service to the entity’s principal address when the registered agent cannot be physically located and personally served. Rule 304 governs county-court process. Subpoenas and service in special cases may be subject to separate rule provisions.

Sources:

• Colorado Rules of Civil Procedure and County Court Rule 304
• Colorado Secretary of State: Registered Agent FAQs
• Colorado Judicial Branch Affidavit of Service, JDF 98

In Colorado district-court civil actions, C.R.C.P. 4(m) sets a 63-day period after filing the complaint for service. If a defendant is not served within that period, the court, after notice, may dismiss without prejudice or order service within a specified time; a showing of good cause requires an appropriate extension. County-court Rule 304(k) uses a different period: 26 weeks after filing the complaint, subject to a good-cause extension. Under C.R.C.P. 12(a), an answer or other response is generally due 21 days after service of the summons and complaint. If the complaint is not served with the summons by special order, or service occurs outside Colorado or by publication, the rule provides 35 days. The December 2025 amendment to C.R.C.P. 4, effective March 16, 2026, revised summons issuance and contents; it did not replace the stated service time limits.

Sources:

• Colorado Rules of Civil Procedure, Rule 12
• Colorado Rule Change 2013(12), Rule 4(m)
• Colorado County Court Rule 304(k), Rule Change 2022(02)
• Colorado Rule Change 2025(25), effective March 16, 2026

The general civil rules restrict who may serve: the server must be at least 18 and not a party, unless a rule or court order provides otherwise. Colorado’s civil service affidavit form asks the server to state those qualifications and identify the documents, date and location of service, and method used. The rules provide particular recipient requirements for substituted service at a person’s residence or workplace. For businesses, the Secretary of State says a registered agent must have a Colorado physical address and receive process for the entity. The sources reviewed do not establish a general prohibition on serving civil process on Sundays or holidays. Time-counting rules for deadlines should not be treated as a restriction on the day or hour of service. Special proceedings, court orders, or specific statutory provisions may impose other requirements; check those before service.

Sources:

• Colorado Rules of Civil Procedure, Rule 4
• Colorado Judicial Branch Affidavit of Service, JDF 98
• Colorado Secretary of State: Registered Agent FAQs

Colorado’s JDF 98 affidavit form requires the server to identify the documents served, state that they are at least 18 and not a party, and record the date, location and method of service, including the recipient where applicable. C.R.C.P. 4(h) governs proof of service and provides different proof mechanisms depending on the method used, including a sheriff’s or other authorized official’s return or an affidavit from a private server. The form is signed as a declaration under oath. After completing service, proof should be returned and filed according to the applicable rule and court procedure. County-court Rule 304 has its own proof-of-service provision. A waiver or admission of service may provide proof through the applicable rule. Since the controlling procedure may vary by court and service method, use the current form and rule that apply to the case.

Sources:

• Colorado Judicial Branch Affidavit of Service, JDF 98
• Colorado Rules of Civil Procedure, Rule 4(h)
• Colorado County Court Rule 304