Standard time - daylight saving time - definition - repeal
C.R.S. § 2-4-109
in effect2-4-109. Standard time - daylight saving time - definition - repeal. (1) (a) The standard time within the state, except as provided in subsection (2) of this section, is that which is now known and designated by act of congress as "United States Mountain Standard Time".
(b) This subsection (1) is repealed, effective on the date subsection (2.5) of this section takes effect.
(2) (a) From two o'clock antemeridian on the second Sunday of March, until two o'clock antemeridian on the first Sunday of November, or such other times and days as may, from time to time, be designated by act of congress, the standard time in this state so established shall be one hour in advance of the standard time now known as "United States Mountain Standard Time".
(b) This subsection (2) is repealed, effective on the date subsection (2.5) of this section takes effect.
(2.5) (a) The standard time within the state throughout the year is coordinated universal time minus six hours. As used in this section, "coordinated universal time" means the time scale maintained through the general conference of weights and measures and interpreted or modified for the United States by the secretary of commerce in coordination with the secretary of the Navy.
(b) (I) This subsection (2.5) takes effect at two o'clock antemeridian on the first Sunday of November after the governor notifies the revisor of statutes that the following conditions have occurred:
(A) A federal law is enacted and takes effect that authorizes states to adopt coordinated universal time minus six hours, commonly known as "United States Mountain Daylight Saving Time", as the standard time for the state throughout the year; and
(B) At least four states in the mountain standard time zone, in addition to Colorado, enact legislation that becomes law making coordinated universal time minus six hours, commonly known as "United States Mountain Daylight Saving Time", the states' standard time throughout the year.
(II) The governor shall notify the revisor of statutes in writing of the date on which the conditions specified in subsection (2.5)(b)(I) of this section have occurred by e-mailing the notice to revisorofstatutes.ga@coleg.gov.
(III) For purposes of this subsection (2.5)(b), the mountain standard time zone includes Arizona, New Mexico, Colorado, Utah, Wyoming, Montana, and the southern portion of Idaho as described in 15 U.S.C. sec. 264.
(3) In all laws, statutes, orders, decrees, rules, and regulations relating to the time of performance of any act by any officer or department of this state, or of any county, city and county, city, town, district, or other political subdivision thereof, or relating to the time in which any rights shall accrue or determine, or within which any act shall or shall not be performed by any person subject to the jurisdiction of the state, and in all the public schools and in all other institutions of this state, or of any county, city and county, city, town, or district thereof, and in all contracts or choses in action made or to be performed in this state, the time shall be as set forth in this section and it shall be so understood and intended.
Source: Open US Law by Vaquill AI (CC BY 4.0)URL: https://leg.colorado.gov/sites/default/files/images/olls/crs2024-title-02.docx#2-4-109Fetched: 10/6/2026