According to the Iowa Department of Transportation, a person must be at least 16 years old to operate a tractor on a public road. In addition, persons under 18 must have a valid driver's license. Persons who are at least 18 years old but do not have a valid driver's license may operate a tractor on a public road if they are supervised by a licensed driver who is at least 18 years old.
There are also restrictions on the type of tractors that can be operated on public roads. Tractors that are used to transport agricultural products or implements must be equipped with certain safety features, such as slow-moving vehicle signs and reflective triangles.
For more information on the requirements for operating a tractor on public roads in Iowa, please visit the Iowa Department of Transportation website.