C.R.S. § 37-90-122

The commission shall examine the petition, and, if it finds that it bears the requisite number of signatures and otherwise meets the stated requirements, it shall thereupon set a date for hearing upon such petition and shall cause notice of such hearing, together with a copy of such petition, to be published, the final publication being not less than ten days nor more than thirty days prior to the date set for such hearing. The cost of such publication shall be paid by the petitioners and shall be advanced by them prior to publication.