The maximum length of a residential lease in Idaho is one (1) year. Leases longer than one year are legal, but they must be in writing (not verbal).
Idaho recognizes verbal agreements for a duration of less than one year as long as the tenant and the landlord are in complete agreement. However, it is recommended that all lease agreements be in writing, as verbal agreements are difficult to prove.
The information for this answer was found on our Idaho Residential Lease Agreement answers.