C.R.S. § 1-4-401: Time of congressional vacancy elections.

(1) Except as provided in section 1-4-401.5, when any vacancy occurs in the office of representative in congress from this state, the governor shall, within seven days of the vacancy, set a day to hold an election to fill the vacancy and cause notice of the election to be given as required in part 2 of article 5 of this title; but no congressional vacancy election shall be held during the ninety days prior to a general election. If the vacancy occurs between one hundred fifty and ninety days prior to a regularly scheduled statewide presidential primary, primary, or coordinated election, the congressional vacancy election shall be held as part of that election. If the vacancy occurs outside the period between one hundred fifty days and ninety days prior to a regularly scheduled statewide presidential primary, primary, or coordinated election, the congressional vacancy election shall be held no less than ninety days and no more than one hundred twenty days after the vacancy occurs.

(2) A congressional vacancy election held as a separate election shall be conducted and the results thereof surveyed and certified in all respects according to the provisions that govern general elections, except as otherwise provided in this code.

(3) A congressional vacancy election held as part of a regularly scheduled statewide election shall be conducted and the results thereof surveyed and certified in all respects according to the provisions governing that regularly scheduled statewide election, except as otherwise provided in this code.