Yes, you will file a CO full resident return if you plan to return to CO and have ties there. If you work abroad and are able to exclude you foreign earned income on the federal return then you are able to exclude this income on your CO state return.
"Living Out of the Country
A Colorado resident reporting U.S. federal taxable income must continue to file Colorado returns as a full-year resident no matter how long he or she is out of the country. Most such individuals are working on a temporary assignment, and plan on returning to Colorado. However, all foreign income that is exempt for federal purposes is also exempt for Colorado purposes.
Individuals who abandon their Colorado domicile and become permanent residents of a foreign country no longer have to file Colorado returns. However, they would have to file a Colorado tax return as a nonresident if they had Colorado-sourced income (e.g., rental income). Such individuals bear the burden of proving their abandonment of Colorado residency.
Continued Colorado residency will be presumed if the individual has not severed all Colorado connections, for example, if the individual still carries a Colorado driver license, votes in Colorado by absentee ballot, still owns a home in Colorado, and/or returns to Colorado." (Colorado Department of Revenue)
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