C.R.S. § 31-10-108

Special elections shall be held on any Tuesday designated by ordinance or resolution of the governing body. No special election shall be held within the ninety days preceding a regular election. No special election shall be called within sixty days before the date thereof, nor shall any special election be held within the thirty-two days before or after the date of a primary, general, or congressional vacancy election. A special election may be held at the same time and place as a primary, congressional vacancy, or general election as a coordinated election pursuant to section 1-7-116 , C.R.S., or may be conducted at the same time as a mail ballot election pursuant to article 7.5 of title 1 , C.R.S. Special elections shall be conducted as nearly as practicable in the same manner as regular elections.