• Up to 1 year –  Verbal can be enforceable
• 1-2 years – Must be in writing and signed by both parties
• 2-3 years- Must be in writing, signed by both parties, notarized,  and recorded in the county where the land is located
• 3 years or more- Must be in writing, signed by both parties before two witnesses, notarized, and recorded in the county where the land is located

Legal references:

O.R.C. § 5301.08 creates an exemption for land leases under 3 years from notarization and recording requirements in O.R.C. § 5301.01