Definitely agree with @preamble1776. There’s only one girl I can think of that I met at orientation who’s still one of my closest friends–but we didn’t even reconnect until towards the end of freshman year. I’m also still really close with someone I met at one of those mixers in the first couple weeks, but even then we went a long time without talking to each other.
On the whole though, most of the people I’m closest to were people that I met right around spring break of freshman year, at the earliest. It’s just one of those things that happens when you least expect it, you know?