This depends if it is your Fertilizer only license. If its just for fertilizer, you do not need to take a class or retest. Just pay the renewal fee. If it is for the pesticide applicators license - A & E - then yes, you will need to sit in one of those lovely classes this year for the renewal. If not you will have to retest and that is not fun. I know from experience. As someone stated above that most of the classes are during peak working times and I missed the class and had to retest a few years back. Will not do that ever again.