Iowa Code Title XIV Chapter 562 Owner-Lessor and Tenant-Lessee governs month-to-month leases. Landlords cannot charge more than two months’ rent as a security deposit according to Iowa law. The landlord must return the security deposit within 30 days of the tenant moving out.
According to §562.4, the notice period for lease termination of an Iowa month-to-month lease, referred to in Iowa law as a tenancy at will, is 30 days. The lease termination must be a written notice.