Colo. Rev. Stat. § 31-12-704
Upon the filing of such petition in the district court, the judge shall set a date for a hearing, not less than forty days nor more than sixty days thereafter. The clerk of the court shall serve a copy of the petition and a notice of the date and the time set for such hearing upon the mayor of the town. The same must be served at least thirty days prior to the hearing on such petition by the court. Upon the hearing and proof of the facts set forth in such petition, the court shall determine whether the tracts of land should be disconnected from the town, and the judge shall enter an order or decree accordingly. When a town has improved any of the highways passing through or adjoining said tracts of land by the construction and maintenance by the town of any special improvements along, under, or over the same for a period of more than two years prior to the presentation of the petition, the petitioners are not entitled to disconnect the land under the provisions of this part 7. Any disconnected land shall be made subject to the applicable county's zoning resolution and map and other land development regulations within ninety days after the effective date of the disconnection as described in section 31-12-501(5).
C.R.S. § 31-12-704
This section is similar to former § 31-8-504 as it existed prior to 1975.