Colo. R. App. P. 25 (2026)

(a) Filing. Documents required or permitted to be filed in the appellate court must be filed with the clerk. Filing may be accomplished by E-Filing pursuant to C.A.R. 30, by mail addressed to the clerk, or by hand delivery to the clerk's office. Pursuant to C.A.R. 30(c)(1), attorneys licensed to practice law in Colorado must use the E-System when filing in the appellate courts. The date of filing of documents is the date they are received by the clerk regardless of method of filing.

(b) Inmate Filings. Documents filed by an inmate confined to an institution will be deemed filed when filed in accordance with C.A.R. 25(b). Documents filed by an inmate confined in an institution are timely filed with the court if deposited in the institution’s internal mailing system on or before the last day for filing. If an institution has a system designed for legal mail, the inmate must use that system to receive the benefit of this rule.

(c) Service of all Documents Required. Copies of all documents filed by any party and not required by these rules to be served by the clerk must, at or before the time of filing, be served by a party or person acting for that party on all other parties to the appeal or review. Service on a party represented by counsel must be made on counsel.

(d) Manner of Service. Service may be personal, by mail, e-mail, or E-Service as defined in C.A.R. 30(a)(4). Personal service includes delivery of the copy to a clerk or other responsible person at the office of counsel. If a self-represented party is served by e-mail, the serving party’s certificate of service must verify that service was made via e-mail and include both the self-represented party’s email address and postal address. E-Service is complete upon the time and date of transmission by the E-Service provider. Registered parties using E-Service must complete service in the appellate court case in which the documents are filed; the appellate courts will not accept service of documents made in the underlying proceedings.

(e) Certificate of Service. Documents presented for filing must include a certificate of service, which is a statement certified by the person who made the service containing the following information: the date and manner of service and the names of the persons served. Regardless of the manner of service, a postal address for self-represented parties must be included in the certificate of service. The certificate of service must be part of or attached to the documents filed. The clerk may permit documents to be conditionally filed without a certificate of service but will require a certificate of service to be filed promptly thereafter.

Source: Entire rule amended and adopted May 17, 2001, effective July 1, 2001; (d) amended and effective February 7, 2008; entire rule amended and effective October 17, 2014; entire rule amended and adopted, effective March 23, 2023 (Rule Change 2023(05)).

Amended by Rule Change 2025(02), adopted January 9, 2025, effective immediately.