(1) To establish a civil union in Colorado, the two parties to the civil union shall satisfy all of the following criteria: (a) Both parties are adults, regardless of the gender of either party; (b) Neither party is a party to another civil union; (c) Neither party is married to another person.
C.R.S. § 14-15-104
Requisites of a valid civil union
Digitized from: Public.Law — Colorado Revised Statutes. Reproduced from public-domain Colorado statutes; confirm against the official source for the current text. Not legal advice.