Thanks so much for the reply! Many states have rules about residency after so many days or months. CO does not have any such rules. The official definition of part year from CO states:
Part-Year Resident Definition
A part-year resident is an individual who was a resident of Colorado for only part of the tax year. This includes anyone who moved into Colorado with the intention of making his/her home here or a Colorado resident who moved out of Colorado with the intention of making his/her home elsewhere any time during the tax year.
Because your move was in 2022, you could be part year. Since 5 days is negligible, you could claim full resident. You can choose the best option for you. Personally, the full year is a bit cleaner. However, you will need to make sure you get credit for tax paid on the income to the other state on your resident CO return. See How do I file a nonresident state return?
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