Colo. Const. art. IV, § 10
The governor, in case of a disagreement between the two houses as to the time of adjournment, may upon the same being certified to him by the house last moving adjournment, adjourn the general assembly to a day not later than the first day of the next regular session.
Source: Entire article added, effective August 1, 1876, see L. 1877, p. 35.