Our state department of education just released its guidance. The short version of it is business as normal. If you cancel school and don't meet the state-mandated number of school hours you will have to make it up. Their rationale is no one that works in a school has tested positive so there is no need to do anything different. FML. Locale department of health can mandate that schools close.
The only good news is most of the schools in our area are on Spring break starting tomorrow.
Edit to add that the state high school basketball tournament is continuing as scheduled too.