Generally speaking, Catholic colleges do not require students to attend mass. This is not guaranteed for every Catholic college, as each one will have different rules and requirements, but typically attendance is not required.
Catholic colleges offer many religious services, which often includes a daily mass. However, most Catholic colleges lean into voluntary participation in order to respect student's individual freedom. That said, they do encourage students to attend mass and other religious services as they are meant to foster community and spiritual growth.
Catholic colleges also pride themselves on having diverse campuses, including religious diversity among students. To foster a community of inclusion and empathy, the colleges allow students to participate in their religious beliefs how they need to, without forcing them to attend Catholic mass.
Again, it is important to note that no two Catholic colleges are exactly the same. While most Catholic colleges do not require students to attend mass, there may be exceptions. To find out what sort of policies a Catholic college has on mass or other religious services, reach out to an admissions officer to search the website of the college(s) you are interested in.