You need to check each school specifically.
Physics is not that hard to check out. When looking at the course catalog and schedules, you can check for the following junior/senior level courses to see that they are offered on a regular basis (minimum once every two years, preferably at least once per year):
- intermediate/advanced (classical and relativistic) mechanics
- electromagnetism (often a two semester sequence)
- quantum mechanics (often a two semester sequence)
- statistical and thermal physics
- intermediate/advanced physics lab
Of course, there can also be physics electives like plasma physics, atomic physics, particle physics, etc… If you have an interest in astronomy, check for astronomy and astrophysics courses, which may be in its own department or under the physics department.
You may want to compare the offerings to those at your state flagship to get an idea for comparison.