The Wall Street Journal had an article noting that even though Florida has had schools open all year, there hasn’t been any surge of cases in the schools or from the schools. (WSJ Article). And see this chart from Twitter, on cases in counties in Florida and whether the county had a mask requirement for schools. You can see that the unmasked counties actually tend to have the lowest case rates. As usual, you have to be careful because high case rates could lead to more masking, but it seems clear that the absence of masking in schools hasn’t led to case surges in the counties where those schools are located.