Colorado Revised Statutes Title 17. Corrections § 17-22.5-301. Good time

(1) Each person sentenced for a crime committed on or after July 1, 1979, but before July 1, 1981, whose conduct indicates that he has substantially observed all of the rules and regulations of the institution or facility in which he has been confined and has faithfully performed the duties assigned to him shall be entitled to a good time deduction of fifteen days a month from his sentence. The good time authorized by this section shall vest quarterly and may not be withdrawn once it has vested. No more than forty-five days of good time may be withheld by the department in any three-month period of sentence.

(2) Each person sentenced for a crime committed on or after July 1, 1981, but before July 1, 1985, shall be subject to all the provisions of this part 3; except that the good time authorized by this section shall vest semiannually and no more than ninety days of good time may be withheld by the department in any six-month period of sentence.

(3) Each person sentenced for a crime committed on or after July 1, 1985, shall be subject to all the provisions of this part 3; except that the good time authorized by this section shall not vest and may be withheld or deducted by the department.

(4) Nothing in this section shall be so construed as to prevent the department from withholding good time earnable in subsequent periods of sentence, but not yet earned, for conduct occurring in a given period of sentence.