Looks like Google and MS already have their new grad applications up, though I don't know when they'll start the actual interviews. How about for other companies? I couldn't find new grad postings up for places like Airbnb, Twitter, Dropbox, Salesforce, Uber, etc. It's a bit of an unrealistic deadline, but I need to get most of my interviews done before September or else I won't be able to interview again till January by which most positions will be gone from what I've heard.
Larger companies will start interviewing earlier