I'm transferring to a new school and it is an hour from my current school. That means, I will be too far from my current employer. Ideally I would like to find a new job between May and September (near to the new school). However, I am happy with my current employer and I have no problems with anyone. Should I tell them that I am looking for a new job due to the long commute to the new school, or would it be better to put in my two weeks notice out of the blue?
I'll let you in on a "secret." (That really isn't one.)
Competent managers know the difference between an employee who's taking some classes and a student who works some to pay their bills. Your manager should know you're in the second category, and is and always has been prepared for the day you move on.
I have techs who work for me in my department. They're right out of college, and they're looking for their first "real" job not working a support desk. I know this, and they know I know this. No one is trying to pretend it isn't what's going on. They're looking, I'm giving references, and I know that every now and then one will find that job they're looking for and move on. All I'm looking for from them is to do good work until that time comes.
Your manager should accept your two weeks' notice, shake your hand, wish you well, and ask you if you know of someone at your school, now, who'd be a good fit to take your place.
You're not breaking up with a romantic interest. This is a job, and everyone knew it was a temporary situation.
Find your new job, give the notice, and try to keep everything as positive as possible. I think you're going to be surprised as to how smooth this will actually go.