Certificate of Service: Colorado allows the termination notice to be delivered to the tenant, left with a family member over age 15 at the property, or posted after the required attempts at personal service. The Certificate records how the notice was served. (C.R.S. § 13-40-108)

Required Notice

Week-to-Week Notice: 3 days (C.R.S. § 13-40-107(2)(d))
Month-to-Month Notice: 21 days (C.R.S. § 13-40-107(2)(c))
Lease Non-Renewal: 90 days with a qualifying no-fault reason (C.R.S. § 38-12-1303(3))

Sample

PDF Word

Colorado Lease Termination Letter

Required Notice

Sample