In our experience, there is really no importance to "track interest", or at least not much, our kids got into plenty of good/reach schools without a visit. If the college sends a rep to your kid's school, it is important to show up and sign in at that session, or any other local event, and sign up on line as interested in admissions events in your area. We found summer visits next to useless, so would focus on narrowing down (urban vs rural, north vs south vs west, small vs big, etc) this spring, and get input from advisor at school first (useless and upsetting to visit schools turns out have NO chance of getting into, or vice versa shooting too low). In the fall if possible go to what are very top likely choices and if possible stay with a student from prior years at your kids high school to get an actual feel for the school (visits during day with parents don't do much to get real knowledge about the place). This is most important if thinking about a place with binding ED, go stay FIRST before make ED commitment. If not ED, not as important and can visit places admitted to in the spring.