C.R.S. § 32-22-115

An action or proceeding at law or in equity to review any acts or proceedings or to question the validity or enjoin the performance of any act or proceedings or the issuance of any bonds or for any other relief against or from any acts or proceedings done under this article 22, whether based upon irregularities or jurisdictional defects, shall not be maintained unless commenced within thirty days after the performance of the act or proceedings or the effective date thereof, whichever occurs first, and is thereafter perpetually barred.