Colo. Rev. Stat. § 37-45-149
Objections to a resolution for an election shall be confined to the question of whether sufficient directors voted in favor of the same. Objections to a petition for such election shall be confined to the question of whether sufficient qualified owners of land situate within the district have signed the petition for such election. Such petition shall be accepted as prima facie evidence of all facts stated therein, and all signatures affixed to such petition shall be presumed to be those of qualified owners residing within the boundaries of the district until the contrary is proven. No signer of a petition shall be permitted to withdraw his name from such petition after it is filed, except for fraud. All objections shall be heard as an advanced case on the docket of the court. Nothing in this section shall be construed to prevent the filing of subsequent resolutions or petitions for the same purpose, but elections on the proposition of dissolution shall not be held more frequently than once every three years.
C.R.S. § 37-45-149