The general rule of thumb I'd use to answer this question is to expect that very few colleges will out right ignore freshman grades; if you're in your college search process then I'd recommend looking up the policy for the specific schools you're applying to.
Furthermore, even if you did receive substantially poor grades freshman year, but you made up for them with strong performance during your sophom*ore and junior year it may actually help your application as it would show to an admissions officer that you have the capacity to improve yourself. Less selective schools may just take your GPA/Grades at face value, but, assuming you're planning on applying to top schools like Princeton and Stanford, you shouldn't have to worry about freshman year grades, as these schools will go through a more rigorous process of figuring out the story behind your grades throughout high school.
