What type of tenancy has no definite starting or ending date specified?

The type of tenancy that has no definite starting or ending date specified is identified as a tenancy at will. In this arrangement, either the landlord or the tenant can terminate the tenancy at any time, with appropriate notice. This lack of a set duration creates a flexible living situation, where the tenant occupies the property with the owner's consent but without a formal written agreement defining a specific term.

This flexibility is what distinguishes a tenancy at will from other types of tenancies that do involve specific time frames. For instance, a tenancy for years has a defined beginning and end date, while a tenancy from period to period is typically tied to lease terms that renew regularly (like month-to-month or week-to-week). A tenancy at sufferance occurs when a tenant remains in possession after their lease has expired but doesn't possess the landlord's consent to stay.

Understanding these distinctions highlights the unique characteristics of a tenancy at will and its implications for both tenants and landlords in Colorado real estate practice.