If you had any income earned there, that earned income may be taxable even though you don't live there.
ACCORDING TO THE STATE OF COLORADO:
"Income earned by an individual while they are not a resident of Colorado will be taxed in Colorado only if it is
considered Colorado-source income and is included in their modified federal adjusted gross income. For Colorado
purposes, the modified adjusted gross income is the federal adjusted gross income plus or minus the applicable
additions and subtractions to federal taxable income that are reported on the Colorado Form 104.
The following types of income are Colorado-source income.
1. Income from a business, trade, profession or occupation carried on in Colorado. This includes income from
any business conducted in Colorado and payments, including wages, received for work performed in Colorado,
either as an independent contractor or as an employee.
2. Income from the ownership of any interest in real or tangible personal property in Colorado. This includes
rents and royalties from real or tangible personal property located in Colorado and the gain or loss from the
sale or other disposition of such property.
3. Pass-through income attributable to sources in Colorado. This includes income earned, received, or realized
as a partner, member, or shareholder in a partnership, limited liability company, or S corporation, to the
extent such income is from Colorado sources.
4. Beneficiary income attributable to sources in Colorado. This includes income earned, received, or realized as
a beneficiary of an estate or trust, to the extent such income is from Colorado sources.
5. Income from the use of intangible property in Colorado. This includes income from intangible property to the
extent such property is employed in a trade, business, profession or occupation carried-on in Colorado.
Examples of such income include interest income from a finance business located in or active in Colorado, or
royalty income from the use of a patent, trademark, or copyright employed in the active conduct of a
Colorado business operation.
6. Income from gambling and games of chance conducted in Colorado. This includes limited stakes gambling,
bingo, raffle, Colorado Lottery, sweepstakes, door prizes and other games of change conducted in Colorado."
https://www.colorado.gov/pacific/sites/default/files/Income6.pdf
