You spent the first 5 days moving into the state so they are negligible if you want to be full year. However, since part-year is giving you a bigger refund with no income difference due to the 5 days, there is more going on.
Please take a look at your actual tax forms as resident and part-year to determine the difference and let us know so we can help. The full year return will use the federal AGI while the part year return will use the CO income. My guess would be you have other income that is not included in the CO part year - but should be. You may need to review your CO entries.
I would be that you can change your part year to Feb for the move. Based on the dates for you to get your license, begin to feel established, register to vote, car insurance changed, etc. Even with Jan, you should be able to claim part year.
Reference: New Colorado Resident | Frequently Asked Questions
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