When I was growing up, spring break in the Fairfax County schools was almost always (note "almost") tied to Easter, though sometimes it was the week after Easter when Easter fell in March. When we were little kids, it was widely known, even among Jewish students, as "Easter vacation," though that custom fell by the wayside. The times when spring break wasn't tied to Easter was normally when Easter fell very late in April (for me, that likely would have been 1984, when Easter fell on April 22; I also vaguely recall spring break being separate from Easter in 1991, when Easter fell on March 31, because I recall one of the teachers being thrown off by it—spring break normally marked the end of the third quarter of the school year but that year it didn't). School here also ended later than it does in many other parts of the country—usually mid-June, around June 16 or so when I was a kid—and I think that had something to do with when spring break was scheduled, as they didn't want it to be too early relative to the end of the school year or too late relative to either when the academic quarters began and ended or high school AP exams.
One significant change they made over the years was a rule that if spring break is not scheduled for the week before Easter, Good Friday will always be a "teacher workday" (i.e., no school for students) and teachers will be given flexibility as to whether they want to work that day or some other. This came up after one year when school was scheduled for that day and they ran into a teacher rebellion when a lot of them sought to take that day off and there weren't enough substitutes.