Modifies the required school year start date for school districts in which a charter school operates

HB 430 sets minimum requirements for school district calendars in Missouri, primarily affecting public school districts (excluding those with charter schools). It mandates that school years begin no earlier than 14 days before the first Monday in September, require a minimum of 1,044 hours of student attendance annually, and include weather make-up days (six days or 36 hours for 2019-20 and later). School districts operating charter schools under specific laws are exempt from these calendar rules. Violations result in withheld state funding equal to 25% of the district’s annual state allocation per violation day.