Colorado constitution
Article IV
Section 7

The governor shall have power to grant reprieves, commutations and pardons after conviction, for all offenses except treason, and except in case of impeachment, subject to such regulations as may be prescribed by law relative to the manner of applying for pardons, but he shall in every case where he may exercise this power, send to the general assembly at its first session thereafter, a transcript of the petition, all proceedings, and the reasons for his action.