We live in Texas full-time but own a home in Colorado. Are we considered full-time or part-time residents of Colorado

[DanielV01]

It depends on how long you stay in Colorado.  You are a domilciliary resident of Texas.  That is where your main home is.  However, if you reside more than 6 months in the home that you have in Colorado, you are considered a statutory resident of Colorado.  Here's a link to a Colorado publication that has more information on this:  

Income 6: Part-Year Resident and Nonresident ... - Colorado.gov

If you are a statutory resident, you file a full-year resident return to Colorado.  However, you may apportion your income so that income you earn in Texas is not taxed in Colorado.

More than likely, however, you were not in Colorado for 6 months or more.  In this case, you are a nonresident of Colorado.  If you earned income in Colorado, you will pay tax on that income to Colorado.  But none of your income earned in Texas is taxable in Colorado.

You are not a part-year resident.  A part-year resident is a status for someone who has moved into Colorado to establish their domicile.  You are not doing that.

[smcelhany]

What about if you lived and worked in Colorado but you begin working in Texas later in the year and are in the process of moving?

[Hal_Al]

Q. What about if you lived and worked in Colorado but you begin working in Texas later in the year and are in the process of moving?

A. You are still a CO resident until you establish a permanent residence in TX.  Permanent residence is when your whole family arrives in TX, to stay.  You will file a part year resident return for CO, including the TX income that was received while you were  still a CO resident.