* State laws: Each state has its own laws regarding school attendance and closures. Some states have waivers or provisions that allow for the cancellation of school days during emergencies without requiring make-up days. Others might require make-up days, but may offer flexibility in how those days are made up (e.g., extending the school year, adding minutes to existing days).
* Severity and duration of the emergency: A short-term emergency might not require make-up days, while a prolonged emergency might necessitate adjustments to the school calendar.
* Specific declaration of emergency: The official declaration of the emergency and any accompanying directives from state or local education authorities will determine the requirements.
* School district policies: Even within a state, individual school districts may have their own policies regarding make-up days, which could be more or less stringent than the state's minimum requirements.
In short, there's no single answer. You must check your state's laws and your school district's specific policies regarding emergency school closures to determine if make-up days are required.