Iowa Code Title VIII. Transportation [Chs. 306-330B] § 321.39. Expiration of registration

1. For vehicles registered by the county treasurer, at midnight on the last day of the registration year. A person shall not be considered to be driving a motor vehicle with an expired registration for a period of one month following the expiration date of the vehicle registration. The one-month period shall be the same as the period defined in section 321.134, subsection 1.

2. For vehicles on which the first installment of an annual registration fee has been paid, at midnight on the last day of June or the first business day of July when June 30 falls on Saturday, Sunday, or a holiday; for vehicles on which the second installment of an annual registration fee has been paid, at midnight on the last day of December or the first business day of January when December 31 falls on Saturday, Sunday, or a holiday.

3. For vehicles registered without payment of annual registration fees as provided in section 321.19, when designated by the department.

4. Registration for every vehicle registered by the county treasurer shall expire upon transfer of ownership.