This bill, titled the Seasonal Agriculture CDL Modernization Act, directs the Secretary of Transportation to update specific regulations related to commercial driver's licenses for the farm-related service industry. Within one year of enactment, the Secretary must revise 49 CFR 383.3(f)(3)(ii) to permit states to establish online registration and renewal systems for seasonal restricted CDLs. This aims to streamline the renewal process for eligible employees and farm-related service industries, provided all other program requirements are met. Furthermore, the bill requires the Secretary to amend 49 CFR 383.3(f) to explicitly state that implements of husbandry are not classified as commercial motor vehicles. This clarification also ensures that these implements are not subject to calculations for gross combination weight rating or gross combination weight, thereby reducing regulatory burdens for agricultural equipment.