How long does a state trademark registration last?

A state trademark registration lasts indefinitely. As long as the trademark owner continues to use the mark, and as long as the mark does not become generic, the trademark owner will continue to have rights in the mark. Each state has its own rules and procedures with regard to what formalities a trademark owner must follow to ensure that their registration is properly renewed and maintained. Most of these procedures are similar to the procedures required by the Lanham Act for maintaining a federal trademark registration, simply requiring the filing of a periodic renewal application.