You are residents of Colorado. The first paragraph clearly states it.
4. What is a Colorado resident?
A Colorado resident is a person who has made a home in Colorado or a person whose intention is to be a Colorado resident. The Department will consider, among other things, Colorado voter registration, Colorado vehicle registration, Colorado driver license, school registration, property ownership and residence of spouse or children in determining intention to be a Colorado resident.
5. How do I establish residency in Colorado?
You can establish residency in one of the following ways:
- Own or operate a business in Colorado
- Are gainfully employed in Colorado
- Reside in Colorado for 90 consecutive days
https://tax.colorado.gov/new-colorado-resident
