It's up to you to evaluate your campus. I ride a geared bike to school, but there are several fixies on campus, all old road bike conversions and kept very mellow looking. One guy I saw with a deep V rear but it was painted reasonably and there certainly are no trispokes or anything on campus. It really depends on your fixie; is it flashy?

Also, my campus is pretty bike friendly; good quality racks and they're pretty much all filled; mostly well placed within sight lines etc. The largest and most used rack is right in front of the library commuter lounge with a window running the full length of the rack; so generally even if you're not there it's less likely for people to be messing around with bikes because they're in full view of the people inside.