You are considered a part-year resident because you moved into the state in 2018. A part-year resident is an individual who was a Colorado resident for only part of the tax year. This includes a person who moved into Colorado during the tax year with the intention of making it their home and a Colorado resident who moved out of Colorado during the tax year with the intention of making their home elsewhere.  The link below has information from the Colorado Department of Revenue that you may find useful.

https://www.colorado.gov/pacific/sites/default/files/Income6.pdf

@TurboTaxLeonard Thanks. I asked because after I review my income tax for Colorado, Turbotax was asking me to change it to Full-Year Resident. The form only accepts MM/YY values, and I placed 01/18 to 12/18.

Your welcome

@TurboTaxLeonard I can't complete my e-file because of this issue, Turbotax is asking me to change to Full-Year Resident because I placed 01/18 to 12/18. Is there a way around to this?

Enter as 02/18 to 12/18 as the dates

@TurboTaxLeonard ok. Now it works. Thanks!