A premarital agreement is effective on marriage. A marital agreement is effective on signing by both parties.
Source: L. 2013: Entire part R&RE, (HB 13-1204), ch. 239, p. 1161, § 1, effective July 1, 2014.
When agreement effective
Colo. Rev. Stat. § 14-2-307, under UNIFORM PREMARITAL AND MARITAL AGREEMENTS ACT.
Colo. Rev. Stat. § 14-2-307