Colo. Rev. Stat. § 31-25-605
At the time of filing the petition or at any time prior to the time of hearing on said petition, a bond shall be filed, with security approved by the governing body, or a cash deposit made sufficient to pay all expenses connected with the proceedings in case the organization of the district is not effected. If at any time during the organization proceedings the governing body is satisfied that the bond first executed or the amount of cash deposited is insufficient in amount, it may require the execution of an additional bond or the deposit of additional cash within a time to be fixed, not less than ten days thereafter, and, upon failure of the petitioners to file or deposit the same, the petition shall be dismissed.
C.R.S. § 31-25-605
This section is similar to former § 31-25-605 as it existed prior to 1975.