The Colorado Landlord Tenant Handbook defines a sublet as a second contract between the landlord and a new tenant that doesn't relieve the original tenant from their obligations under the lease. As with sublets everywhere, if the subtenant doesn't pay rent then a landlord may sue the original tenant, the subtenant, or both.
In Colorado your lease can allow, restrict or completely prohibit your right to sublet. In all cases, you are required to get written landlord approval. Even if your lease makes no mention of subletting at all, you still have to get written approval.
The information provided on this website does not, and is not intended to, constitute legal advice.