Idaho: https://tax.idaho.gov/taxes/income-tax/business-income/guides-for-certain-businesses/income-tax-for-...
Colorado: https://tax.colorado.gov/estates-trusts (only if there is Colorado source income for nonresident trusts)
California: https://www.ftb.ca.gov/file/personal/filing-situations/estates-and-trusts/index.html
Very sorry for your loss
