If you earned income in Colorado, but did not live there in 2018, you can file a Non-Resident Colorado return to report it.
If this is the case, the State of Colorado will note your filing status is 'Non-Resident', not 'Part Year Resident' and inform you if an Amended Return is needed (which it may not be).
You can also proactively contact the Colorado Dept. of Revenue:
https://www.colorado.gov/pacific/tax/contact-us-129
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