Last names starting with "P", "Q", or "R", vehicle registration expires September 30, 2022.
Kansas license plates expire based on the first letter in the last name of the first person on the title.
Trailers and heavy trucks are registered on a calendar year. The tag expires December 31st. They can be renewed anytime after the first of the following year and must be paid by February 28th (or 29th) to avoid penalties.