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 set a day to hold a congressional vacancy 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 congressional vacancy elections shall not be held within the ninety-day period preceding a general election.
C.R.S. § 1-12-202
This section is similar to former § 1-12-102 as it existed prior to 1992.
For registration for congressional vacancy elections, see § 1-2-210; for power of the county central committee to fill vacancies, see § 1-3-104.