<p>Junior year is important - but they do look at your GPA from your sophomore and freshman years as well. If these years put your GPA into say, the straight B range, you should certainly still apply, but just be aware that you need to cast a wider net with your other applications. </p>
<p>Also be aware that rank by decile is often available to colleges - even if the school does not officially rank. If you can get any sense of where you stand, it will help you evaluate your options.</p>