I'm a vault coach. I believe tracks should be open to the public when not used by the school, and outside of school hours.
Since vault coaches are a limited resource, half the schools in the area were looking for a coach and approached me to coach there when I moved to where I live now. I asked each one if their track had public hours. The ones the said no, I told them I was only willing to coach somewhere with the track open to the public. Eventually I found a program with the track open to the public, needing a vault coach, and a head coach I respected. I'm entering my third season of coaching at a very positive program.