We recommend that you apply to all schools that you might be interested in before the February application deadline. After that date, you will still be able to apply to other schools in the Round 2 application process. However, by that time, all schools will have already run their lotteries, and most of them will only be accepting applications for their waitlist. Applying to multiple schools before the February deadline is in your best interest, as it will have no impact on your application to School X while increasing your overall chances of receiving an enrollment offer.