My boyfriend works for a lawncare company and his boss doesn't pay overtime. He says it is because he lets his employees mow their yards at home with his equipment and on the clock. I told him that if that's the case, we will mow our own yard on Sundays!! I was trying to look online for the law, but I can't find a clear answer on the seasonal thing.

It is seasonal work. As to overtime, I am pretty sure that if he is considered a professional, overtime is not required to be paid. I did not read the entire link, but he may be considered agriculture and therefor exempt from overtime.

Contact the State of Ohio Dept of Labor. They should be able to give you the exact answers you need.